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leo
10-01-2009, 14:06
Lets have a look what you've built over the years, please keep this mainly as a gallery rather than a discussion thread, just a short description what it is etc:)
I'll start off, unfortunately my HD died and I've lost a lot of pics so heres a few bits and pieces I could find.

Diy Pedja Rogic AYA dac
http://i273.photobucket.com/albums/jj220/kingbusoms/f15fd40c.jpg
TP Buffalo dac based around ES9008 Sabre dac modded with Paul Hynes shunt and series regs Regs
http://i273.photobucket.com/albums/jj220/kingbusoms/027.jpg
Diy TDA143 Dac
http://i273.photobucket.com/albums/jj220/kingbusoms/010-1.jpg
Modded UCD amp modules
http://pic20.picturetrail.com/VOL1293/4634025/12749957/271121423.jpg
Various diy amps
http://pic20.picturetrail.com/VOL1293/4634025/12749957/271121643.jpg
Modified diy Ezdac
http://pic20.picturetrail.com/VOL1293/4634025/12749957/245458821.jpg
Diy Mauro MyrefC chip based amp
http://pic20.picturetrail.com/VOL1293/4634025/12749957/271121419.jpg
Diy AD815 pre
http://pic20.picturetrail.com/VOL1293/4634025/12749957/271121025.jpg
Diy TDA1543 based dac with asynchronous reclocker
http://pic20.picturetrail.com/VOL1293/4634025/12749957/271121647.jpg
Diy Dual TDA1541A S1 based dac
http://pic20.picturetrail.com/VOL1293/4634025/12749957/271121639.jpg
Diy valve output stage for TDA1541 dual dac
http://pic20.picturetrail.com/VOL1293/4634025/12749957/217325186.jpg
Diy Millet Hybrid headphone amp
http://pic20.picturetrail.com/VOL1293/4634025/12749957/271121425.jpg
Modified CDP
http://pic20.picturetrail.com/VOL1293/4634025/12749957/271121424.jpg
Diy silver Interconnects
http://pic20.picturetrail.com/VOL1293/4634025/12749957/271121417.jpg
Modded ALW super regs
http://pic20.picturetrail.com/VOL1293/4634025/12749957/240452421.jpg
Diy 41hz Amp6
http://pic20.picturetrail.com/VOL1293/4634025/12749957/271121026.jpg
Inside of Amp6
http://pic20.picturetrail.com/VOL1293/4634025/12749957/271121024.jpg
Diy PCM794 dac before upgraded regs etc
http://pic20.picturetrail.com/VOL1293/4634025/12749957/271229487.jpg
Diy Elso Kwack clock
http://i273.photobucket.com/albums/jj220/kingbusoms/DSCF0828.jpg

Filterlab
10-01-2009, 14:09
:lol:

Only the one thing, and that wasn't built internally by me either, but I'm proud of my first attempt at cheap recasing. :)

http://s560.photobucket.com/albums/ss49/aos_images/random_stuff/PP16.jpg

Tony Moore
10-01-2009, 16:52
Well...you _did_ ask so I'll bore you all to death! :doh:

http://i296.photobucket.com/albums/mm168/TonyMoore300B/CDPro2.jpg

This is my CD Pro2 based CD transport. Bought form Daisy Laser as a mechanism and the controller board. I built the power supplies and the case. Metalwork for the case came from Schaeffer in Germany to my own spec. Soon after building this I discoverd SqueezeBoxes. Thanks Neal. :doh:

http://i296.photobucket.com/albums/mm168/TonyMoore300B/DACWithSBR.jpg

And the SqueezeBox Receiver based player. SBR feeds into a reclocking circuit based around a Tent Labs XO3 and D flip-flops and then on into the Pedja Rogic TDA1541A DAC pcb. Output buffer is provided by Hawk Audio's MP-DAC output stage.

http://i296.photobucket.com/albums/mm168/TonyMoore300B/amp15.jpg

WAD 300B PushPull clone. I went for a tagstrip based system instead of the pcbs as originally specced. Great sounding amp!!

http://i296.photobucket.com/albums/mm168/TonyMoore300B/s5tlb.jpg

And my IPL S5TL Golds. Built from pre-veneered wood kit. I'm not much of a woodworker. Very nice sounding speakers.

http://i296.photobucket.com/albums/mm168/TonyMoore300B/s5tld.jpg

http://i296.photobucket.com/albums/mm168/TonyMoore300B/WAD_HD83.jpg

WAD HD83 Headphone amp. (Pre-WD one)

http://i296.photobucket.com/albums/mm168/TonyMoore300B/mpdac.jpg

Hawk Audio MP-DAC III Kit DAC. Great DAC. Would've still been using it as-is but got into the TDA1541 chip a couple of years after building the MP-DAC and steered a path to non-oversampling that I've not recovered from! Hawk's buffer stage and psu are in my current SqueezeBox/TDA1541A hybrid unit and I can always go back to the Crystal based DAC pcb if I feel like it.

http://i296.photobucket.com/albums/mm168/TonyMoore300B/2A3.jpg

WAD 2A3 PSE amp. 2003. Wanted a single ended sound, eventually went back to Kit6550 and then onto the 300B PP that I'm using now.

http://i296.photobucket.com/albums/mm168/TonyMoore300B/Kit6650Inside.jpg

WAD Kit6550 Amp. 2001 My 2nd kit after building the WAD Kel84. This version is as it was just before I sold it recently. Very much beefed up with Blackgate WKzs, etc.

http://i296.photobucket.com/albums/mm168/TonyMoore300B/PSU2.jpg

WAD Phono2/PSU2 with the PSU part built on hardwired tagstrips.

And finally....see if anyone can guess what this is:

http://i296.photobucket.com/albums/mm168/TonyMoore300B/IMG_1530copy.jpg

:lol:

Oh well, ok. It's nothing to do with audio. It's my own design remote speed controls for Scalextric! Little tx/rx radio boards from Maplin and PIC microcontrollers at each end to send the speed signal in serial form from the hand controllers to the box pictured, which drives the track. It was a blast being able to walk around while driving the cars! :smoking: That was back in my pre-DIY audio days! :lolsign:

Marco
10-01-2009, 17:00
Fantastic, chaps. Keep 'em coming - it's just what we're looking for!

Well done, Leo. Keep up the good work :)

Marco.

Beechwoods
10-01-2009, 17:11
Great thread! Us armchair DIYers love to see some good pics!

Filterlab
10-01-2009, 17:21
Us armchair DIYers love to see some good pics!

You make armchairs in your spare time?

Beechwoods
10-01-2009, 17:27
When I'm not looking at DIY Hi-Fi porn :)

Marco
10-01-2009, 17:41
This is an old pic taken before final glue up hence the clamps!

177

That pic's coming up as a blank for me, Steve, as a white box with a red cross and the following info:


Name: sachiko.jpg, Views:0, Size: 27.5KB, ID:177

:scratch:

Marco.

aquapiranha
10-01-2009, 17:47
Sorry Marco. I have linked it so now you can see all the Hi-Fi related tat I have / had lying around... Obviously the pic was taken a while ago before final glueing.

http://i205.photobucket.com/albums/bb256/aquapiranha/Sachiko/CIMG3006.jpg

Marco
10-01-2009, 17:49
Ah, that's better. I recognise that room and those excellent speakers :)

Marco.

P.S What does "linled" mean?

aquapiranha
10-01-2009, 17:51
Ah, that's better. I recognise that room and those excellent speakers :)

Marco.

P.S What does "linled" mean?

It means you are a pedantic **** :eyebrows:

I have edited it now...

Marco
10-01-2009, 17:56
LOL! Trust me, I wasn't being pedantic. I thought it was some fancy computer term I hadn't heard of! For me, this is not unusual :lol:

Marco.

Filterlab
10-01-2009, 19:47
Those speakers are nothing short of astonishing! How long did the design and build take Steve?

Mike
10-01-2009, 20:57
http://i296.photobucket.com/albums/mm168/TonyMoore300B/2A3.jpg

WAD 2A3 PSE amp. 2003. Wanted a single ended sound, eventually went back to Kit6550 and then onto the 300B PP that I'm using now.

Lovely layout Tony, puts my own 'rats nest' efforts to shame! :)

I'll drum up some pic's soon.

aquapiranha
10-01-2009, 23:49
Those speakers are nothing short of astonishing! How long did the design and build take Steve?

Well the credit for the design goes to Scottmoose over on Diyaudio. They are a design called Sachiko from the "Spawn of Frugal Horn" range. The plans are free to download form the site. The drivers are Fostex FE206's modified by Dave at Planet10. The build itself took me a while as I did not have a table saw so had to use a jigsaw / handsaw! but it was definitly worth it, I am very pleased with the results.

Primalsea
11-01-2009, 16:09
Heres pics of my ultilitarian power amp thats used for testing and general listening in the spare room where I do my DIY stuff.
The amp was cracked open as I was re adjusting the bias. Not pretty but works very well.

http://i44.photobucket.com/albums/f23/primalsea/001-2.jpg
http://i44.photobucket.com/albums/f23/primalsea/002-2.jpg
http://i44.photobucket.com/albums/f23/primalsea/005-1.jpg
http://i44.photobucket.com/albums/f23/primalsea/006-1.jpg

Homemade Tonearm
http://i44.photobucket.com/albums/f23/primalsea/008.jpg

Diy active speakers
http://i44.photobucket.com/albums/f23/primalsea/DIYSpeakers.jpg
http://i44.photobucket.com/albums/f23/primalsea/DiySpeakers2.jpg

leo
11-01-2009, 16:53
Some nice work guys, keep em coming:smoking:

John
11-01-2009, 17:38
Great Thread guys wish I had some talent that way

Mike
12-01-2009, 20:52
Can you spot the difference? :)

WD88Almost XL

http://img152.imageshack.us/img152/3309/p1032550kb0.jpg
By shian7 (http://profile.imageshack.us/user/shian7), shot with u30D,S410D,u410D (http://profile.imageshack.us/camerabuy.php?model=u30D%2CS410D%2Cu410D&make=OLYMPUS+CORPORATION) at 2009-01-12


WD88XL with bells on! ;)

http://img152.imageshack.us/img152/1907/p1122553nv4.jpg
By shian7 (http://profile.imageshack.us/user/shian7), shot with u30D,S410D,u410D (http://profile.imageshack.us/camerabuy.php?model=u30D%2CS410D%2Cu410D&make=OLYMPUS+CORPORATION) at 2009-01-12

Beechwoods
12-01-2009, 21:02
There's a good five minutes 'spot the difference' there, Mike :) What's the prize :lol:

Have you got a stepped volumes control at the front as well? Tell us something about the mods you've done!

shane
13-01-2009, 10:13
Biggest difference is the bottom doesn'tfit anymore cos of those bloody great Rifas. ;)

Mike
13-01-2009, 12:06
Well thankfully the bottom does still fit! :)

Mods include the big Rifa's Shane mentioned and the ladder type stepped attenuator in place of the 'shunted' Alps black. Then there's the solid silver in PTFE wiring for most of the signal carrying bits, and a smattering of Holco resistors.

I don't hold out too much hope for the stepped attenuator as it's populated with cheap n cheerful 1/4W metal film resistors, but if the values are about right and I get back the input sensitivity I'll be happy. I can use 'posh' resistors later should I feel the need.

Biggest problem I've got ATM is I've lost my CD-ROM with all the diagrams and assembly instructions etc, on it. I'm going to have to find it or get one from somewhere as all the testing procedure and what have you are on there too! :scratch:

Cheers...

Beechwoods
13-01-2009, 12:30
Aah just wing it. What's the worst that could happen? ;)

evozero
13-04-2009, 14:56
Hi All,
Other than a PCB phonostage, this is the only DIY kit. But i am Very happy with the results!
http://i732.photobucket.com/albums/ww322/evozero7/P1050469resized.jpg

diyaudio forum's Mark Kelly controller with Maxon dc motor, VPI Scout platter,clamp and bearing. SME III rewired arm with AT33PTG mc cartridge and CA640P phonostage.
Cheers
Ian

SteveTheShadow
26-04-2009, 15:12
Here's another bit of DIY from the Shadow household.

This is a one watt DRD amp based on the National Union 46 tube.

It is the little square amp, sitting next to the big PX25 DRD amp.

Through the 100dB efficient open baffles it kicks some serious butt and sounds lovely.

http://homepage.mac.com/scress1958/.Pictures/46done.jpg

Steve

TheMooN
02-07-2009, 13:37
Currently Test running a recently new wound 7k A>A , U/L 43% , bolted on to a Faithful old and much abused FrankenBeast test chassis .

TheMooN
02-07-2009, 16:42
Slightly different Winding Spec Still 7K a-a , 4 thou cores , differing with 8 secondary sections , 43% , On Plug > in Switch on > Pray Test !

machinehead
31-10-2009, 13:45
Hi Leo, on your DIY silver interconnects, where did you get that nice pin stiped outer with cable jacket?

Thanks.

SteveTheShadow
03-11-2009, 19:16
Here's my latest creation.

Its' a three stage amp comprising 76/801A DRD stage feeding TJ Meshplate PX25s
http://homepage.mac.com/scress1958/.Pictures/moody1.jpg
http://homepage.mac.com/scress1958/.Pictures/moody2.jpg
http://homepage.mac.com/scress1958/.Pictures/doneandworking.jpg



Steve

Marco
03-11-2009, 19:28
Looks awesome, Steve! :youtheman:

How's it sounding - are you pleased with the results? :)

Marco.

SteveTheShadow
05-11-2009, 17:37
Hi Marco

I'm extremely pleased with this amp.
Being an evolution from the two stage amp I had before
it didn't take that long to build.

The sound is in a different league to the two stager you
heard at Owston. I love it!

Rare Bird
05-11-2009, 19:56
Looks awesome, Steve! :youtheman:



He's from S.Yorkshire man what you expect

:lolsign:

flatpopely
08-02-2010, 16:04
DIY HiCap clone using SuperTeddyRegs and DIY regulator board. Now rewired so that all earths go to a single point but otherwise identical.

http://i178.photobucket.com/albums/w258/Andrew_Popely/Hi%20Fi/Prefix%20K/DSC_3599.jpg

Modified NAIM NAC72 with new Noble pot and internal TeddyRegs on each card. 321, 729 and 324s replaced with DIY NJ cards.

http://i178.photobucket.com/albums/w258/Andrew_Popely/Hi%20Fi/72%20TR/DSC_2147.jpg

DSJR
09-02-2010, 19:29
Julian would turn in his grave, you naughty man :lol:

Ali Tait
09-02-2010, 19:43
Nice job!

flatpopely
10-02-2010, 13:39
Sounds good too!

Strosek
12-09-2010, 02:13
Here's my Pass F5 amplifier... Class A at it's best!


2605

Marco
14-09-2010, 21:32
http://i178.photobucket.com/albums/w258/Andrew_Popely/Hi%20Fi/72%20TR/DSC_2147.jpg

Where are the valves? :)

Marco.

DSJR
15-09-2010, 09:28
:D

satanfriendly
12-01-2011, 13:02
What to do with a beat up old RD110

http://i35.photobucket.com/albums/d166/iowajoey/RD110004.jpg

http://i35.photobucket.com/albums/d166/iowajoey/catsandsods006.jpg

http://i35.photobucket.com/albums/d166/iowajoey/RD110006.jpg

http://i35.photobucket.com/albums/d166/iowajoey/Ariston10Jul09004.jpg

http://i35.photobucket.com/albums/d166/iowajoey/Ariston10Jul09005.jpg

Throw an Anchromat and a Heed 2 in to the equation and voila a new TT. 774 modified curtosy of J7 at Audio Origami because no one does it better. Lots more photos available but don't want to clutter the site too much.

Rare Bird
12-01-2011, 13:26
Nice job Chris, Original '774' was a proper arm anorl ..Did you get those PT Carbon top plates sorted?

satanfriendly
12-01-2011, 17:04
I did that Andre. The PT looks rather fetching in CF, but wish I'd used a bit thicker sheet as 1mm is a little too flimsy. Plus I learnt a few lessons along the way so may go there again in the future.

Wasn't too much of an issue on the 110 as the whole lot has a composite structure on the underside supporting the CF which is just there for asthetics.

Rare Bird
12-01-2011, 17:27
Can't you get tho's cutter burn marks out of the grooves at all?

satanfriendly
13-01-2011, 11:39
Someone did mention some old world and nigh on impossible to attain fluid, but otherwise I left it 'as is' for character!

To try and sand them out would have ruined the fluting.

Best way to deal with it, is to have a sharp router in the first place.

Rare Bird
13-01-2011, 11:43
Best way to deal with it, is to have a sharp router in the first place.

Machining like that needs the cutter to be running at higher speeds than a router can give to be rights

UV101
03-04-2011, 17:27
Ok! Latest little mess about! Not really a fan of spdif, but as it's the universal connection to a dac, I though I'd have a play. Got this 1541a based dac on eBay with a fault. The original dac was a non a version and looked like a copy. Anyway, as I have a few of these chips about the place it was too hard to find the fault (scope is well handy!!).

As I can't leave anything alone, I set about some mods. Fet based reg on the filter, seperate STD 7805's for the receiver both analogue and digital, audiocom regs on the 3 supplies to the tda, loads of uF on the supplies, LME47920HA's decoupled with pans FM and bummed the horrid elco dc blockers for some ampohm's! How's it sound? a million dollars! Def worthy of a case and a bit more work ;-)

Couple if pics for those who like that sort of thing (that would include me!!)

UV101
03-04-2011, 17:30
and bummed the horrid elco dc blockers for some ampohm's! :stalks::stalks::stalks:

Bloody iPhone and taptalk!!!! I would like to point out for the record that there was no bumming whatsoever involved in this recent project. :doh::lol:

Thanks

Alex_UK
03-04-2011, 22:03
:lol: - Can't beat a bit of iphone Autocorrect! (http://theartofsound.net/forum/showpost.php?p=189001&postcount=446)

Firebottle
09-10-2012, 14:38
Made this for development work, plus and minus outputs up to 290V.
Cost me nothing too :), all parts out of the skip.
http://i601.photobucket.com/albums/tt97/Paramotorpilot/Valve%20amp/P1020822.jpg

http://i601.photobucket.com/albums/tt97/Paramotorpilot/Valve%20amp/P1020823.jpg

Cheers, Alan

Thermionic Idler
17-11-2012, 00:56
Progress so far on a Transcendent Sound "Son of Beast" 15W OTL. The only one in his range that's fully point-to-point (though I think there's a 300B SE OTL in the works which will be also) --- 2 weeks and it's still not done!

http://farm9.staticflickr.com/8338/8192095068_cf8a472c57_b.jpg

337alant
28-01-2013, 16:48
http://i259.photobucket.com/albums/hh290/337alant/hackernap4.jpg

http://i259.photobucket.com/albums/hh290/337alant/hackernap1.jpg

http://i259.photobucket.com/albums/hh290/337alant/hackernap3.jpg

http://i259.photobucket.com/albums/hh290/337alant/hackernap5.jpg

http://www.flickr.com/photos/69508926@N05/6824034044/in/set-72157628898899541/

Alan

Greg2010
28-01-2013, 17:30
Tidy piece of work Alan, I take it it's a naim clone.
Have you had the chance to listen to it yet?


Regards
Greg

Puffin
28-01-2013, 19:45
I have some of these boards......somewhere:scratch:

I was going to pair them with a B4 that I built, but had a problem with it and so got shelved. Dodgy ebay parts me thinks.

Nice build.

337alant
29-01-2013, 14:47
Greg
Yes Ive been running this amp for about 9 months now and its excellent a great all rounder really
As you say its actualy a Naim Nap / Avondale NCC 200 plus a few Acoustica tweeks hybrid but it also has a seperate front end power supply which makes all the difference :).
Mine runs on 53v rails for the output and 56V for the Front end so there is approx 100W into 8 ohms.
Puffin I am also using this amp with a B4 and they are a great combination so try and make time to build your Hackernap power amp.

http://i259.photobucket.com/albums/hh290/337alant/B4.jpg



Alan

gariusmacus
27-04-2013, 12:38
apart from my RCM which i just finished, this is all I still have and use, a Heathkit aj-1214 am-fm tuner I built in about 1978/79

http://i1310.photobucket.com/albums/s654/Gary_McDonald/IMG_0167_zps64cc0111.jpg

http://i1310.photobucket.com/albums/s654/Gary_McDonald/IMG_0166_zps84c7b547.jpg

http://i1310.photobucket.com/albums/s654/Gary_McDonald/null_zpscd2ec1d5.jpg

hydrovac
26-06-2013, 09:50
Hi, posting some pictures of LM3875 Gain-clone amp build.

http://farm3.staticflickr.com/2825/9104820979_4cf88e2b95.jpg (http://www.flickr.com/photos/97860410@N03/9104820979/)
IMG_4343 (http://www.flickr.com/photos/97860410@N03/9104820979/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm4.staticflickr.com/3776/9142751740_f10da60b3f.jpg (http://www.flickr.com/photos/97860410@N03/9142751740/)
IMG_4430 (http://www.flickr.com/photos/97860410@N03/9142751740/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm8.staticflickr.com/7343/9140532679_df7b826ee1.jpg (http://www.flickr.com/photos/97860410@N03/9140532679/)
IMG_4429 (http://www.flickr.com/photos/97860410@N03/9140532679/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm8.staticflickr.com/7420/9140514489_8743b2a296.jpg (http://www.flickr.com/photos/97860410@N03/9140514489/)
IMG_4428 (http://www.flickr.com/photos/97860410@N03/9140514489/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm3.staticflickr.com/2873/9104531207_92cdbd047e.jpg (http://www.flickr.com/photos/97860410@N03/9104531207/)
IMG_4323 (http://www.flickr.com/photos/97860410@N03/9104531207/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm8.staticflickr.com/7316/9106766044_979f6f4240.jpg (http://www.flickr.com/photos/97860410@N03/9106766044/)
IMG_4322 (http://www.flickr.com/photos/97860410@N03/9106766044/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm4.staticflickr.com/3695/9106771214_49aa3dd5e3.jpg (http://www.flickr.com/photos/97860410@N03/9106771214/)
IMG_4321 (http://www.flickr.com/photos/97860410@N03/9106771214/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm6.staticflickr.com/5461/9104548081_c24dd19316.jpg (http://www.flickr.com/photos/97860410@N03/9104548081/)
IMG_4319 (http://www.flickr.com/photos/97860410@N03/9104548081/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

Puffin
26-06-2013, 11:49
A few years ago I made some LM3875 monoblocks point to point with a regulated PS (see Decibel Dungeon) for details. Nice amps and better than the LM3886's IMO. Nice build.

hydrovac
29-06-2013, 06:06
Few pictures of TDA7293 MOSFET based 2.1 integrated amp project.

http://imageshack.us/a/img811/7849/img4146gq.jpg

http://imageshack.us/a/img845/8687/img4143u.jpg

http://imageshack.us/a/img32/8050/img4142ia.jpg

http://imageshack.us/a/img18/2544/img4141tu.jpg

Completed Amp. Waiting for finishing.

http://farm3.staticflickr.com/2871/9107321136_5af4bd22dc.jpg (http://www.flickr.com/photos/97860410@N03/9107321136/)
IMG_4383 (http://www.flickr.com/photos/97860410@N03/9107321136/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm6.staticflickr.com/5472/9107328414_140df18b02.jpg (http://www.flickr.com/photos/97860410@N03/9107328414/)
IMG_4382 (http://www.flickr.com/photos/97860410@N03/9107328414/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm4.staticflickr.com/3753/9105124499_4bddba7deb.jpg (http://www.flickr.com/photos/97860410@N03/9105124499/)
IMG_4370 (http://www.flickr.com/photos/97860410@N03/9105124499/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm3.staticflickr.com/2842/9107133870_d841702244.jpg (http://www.flickr.com/photos/97860410@N03/9107133870/)
IMG_4357 (http://www.flickr.com/photos/97860410@N03/9107133870/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm4.staticflickr.com/3831/9104772957_1dc4b0e340.jpg (http://www.flickr.com/photos/97860410@N03/9104772957/)
IMG_4374 (http://www.flickr.com/photos/97860410@N03/9104772957/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

hydrovac
14-07-2013, 17:47
I was looking around for quite some time trying to find a simple buffer to drive my high gain power amplifier. Too much gain is a curse that afflicts many systems. It's always seemed nuts to me to throw away most of the signal as it comes in then amplify it again, which is what a normal preamp does most of the time.
The B1 starts with the premise that there is enough gain already and that the only tasks of a preamp are switching, impedance matching and attenuation (not amplification), with attention paid to maintaining the musical integrity of the signal (including nuance & timing) that can get lost on the way through.

This is my first put together Pass B1 buffer preamp. Cabinet is an all-metal case with 8mm anodized alloy faceplate(final).

Few pics of the build.

http://farm8.staticflickr.com/7304/9164026217_f38c4edce7.jpg (http://www.flickr.com/photos/97860410@N03/9164026217/)
img4255gw (http://www.flickr.com/photos/97860410@N03/9164026217/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm3.staticflickr.com/2834/9166250378_d305977e0c.jpg (http://www.flickr.com/photos/97860410@N03/9166250378/)
img4253pi (http://www.flickr.com/photos/97860410@N03/9166250378/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm8.staticflickr.com/7381/9166263704_3655d68452.jpg (http://www.flickr.com/photos/97860410@N03/9166263704/)
img4249k (http://www.flickr.com/photos/97860410@N03/9166263704/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm8.staticflickr.com/7302/9164042799_e7c45f3b74.jpg (http://www.flickr.com/photos/97860410@N03/9164042799/)
img4248e (http://www.flickr.com/photos/97860410@N03/9164042799/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm4.staticflickr.com/3735/9164021803_f689465d27.jpg (http://www.flickr.com/photos/97860410@N03/9164021803/)
img4259jg (http://www.flickr.com/photos/97860410@N03/9164021803/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm3.staticflickr.com/2874/9166248266_a74730be13.jpg (http://www.flickr.com/photos/97860410@N03/9166248266/)
img4258z (http://www.flickr.com/photos/97860410@N03/9166248266/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm6.staticflickr.com/5461/9164017385_9160d87709.jpg (http://www.flickr.com/photos/97860410@N03/9164017385/)
img4271ub (http://www.flickr.com/photos/97860410@N03/9164017385/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm3.staticflickr.com/2833/9164020343_7dcdce588d.jpg (http://www.flickr.com/photos/97860410@N03/9164020343/)
img4261g (http://www.flickr.com/photos/97860410@N03/9164020343/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm8.staticflickr.com/7330/9164019255_bfc72360d3.jpg (http://www.flickr.com/photos/97860410@N03/9164019255/)
img4263c (http://www.flickr.com/photos/97860410@N03/9164019255/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm8.staticflickr.com/7349/9164016045_e088b2cc06.jpg (http://www.flickr.com/photos/97860410@N03/9164016045/)
img4274dg (http://www.flickr.com/photos/97860410@N03/9164016045/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

pics of my finished B1 Preamp, all wired up and ready for an audition. The source is a Rega Jupiter CDP.

Overall, I am super pleased with this preamp as you can probably tell. I would advise anyone to give it a try. Very simple to build, it doesn't need to be expensive, and you may hear a lot of what your current preamp is not telling you.

http://farm6.staticflickr.com/5522/9104754197_92cb0c66cc.jpg (http://www.flickr.com/photos/97860410@N03/9104754197/)
IMG_4272 (http://www.flickr.com/photos/97860410@N03/9104754197/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm6.staticflickr.com/5339/9104738837_0bff2d078f.jpg (http://www.flickr.com/photos/97860410@N03/9104738837/)
IMG_4275 (http://www.flickr.com/photos/97860410@N03/9104738837/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm8.staticflickr.com/7379/9164012945_e6e19f7807.jpg (http://www.flickr.com/photos/97860410@N03/9164012945/)
img4277vb (http://www.flickr.com/photos/97860410@N03/9164012945/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm4.staticflickr.com/3714/9106945228_af760b7bd9.jpg (http://www.flickr.com/photos/97860410@N03/9106945228/)
IMG_4282 (http://www.flickr.com/photos/97860410@N03/9106945228/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm8.staticflickr.com/7403/9164009915_cab3e0f7c5.jpg (http://www.flickr.com/photos/97860410@N03/9164009915/)
img4290o (http://www.flickr.com/photos/97860410@N03/9164009915/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

hydrovac
19-07-2013, 17:52
Hi all DIYers,

Building a 300 watt Hi-fi power amp, which we designed and prototyped few years ago.
Please follow the links for details.

http://www.diyaudio.com/forums/solid-state/10387-310w-power-amplifier.html
http://www.diyaudio.com/forums/solid-state/10387-310w-power-amplifier-4.html#post1330047

PCBs have been fabricated and gathering all components on hand.
Few pictures of the same.

http://farm4.staticflickr.com/3770/9145285084_8b4b97e133.jpg (http://www.flickr.com/photos/97860410@N03/9145285084/)
IMG_4459 (http://www.flickr.com/photos/97860410@N03/9145285084/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm4.staticflickr.com/3713/9145289556_ba719a7661.jpg (http://www.flickr.com/photos/97860410@N03/9145289556/)
IMG_4458 (http://www.flickr.com/photos/97860410@N03/9145289556/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm4.staticflickr.com/3821/9145279556_894c7e60b4.jpg (http://www.flickr.com/photos/97860410@N03/9145279556/)
IMG_4461 (http://www.flickr.com/photos/97860410@N03/9145279556/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm8.staticflickr.com/7454/9143047875_a4f9cc0bcb.jpg (http://www.flickr.com/photos/97860410@N03/9143047875/)
IMG_4462 (http://www.flickr.com/photos/97860410@N03/9143047875/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm6.staticflickr.com/5482/9200719634_08cc90296a.jpg (http://www.flickr.com/photos/97860410@N03/9200719634/)
IMG_4570 (http://www.flickr.com/photos/97860410@N03/9200719634/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm4.staticflickr.com/3777/9197922159_e7c9c4a94b.jpg (http://www.flickr.com/photos/97860410@N03/9197922159/)
IMG_4575 (http://www.flickr.com/photos/97860410@N03/9197922159/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm4.staticflickr.com/3677/9143037457_ec66128356.jpg (http://www.flickr.com/photos/97860410@N03/9143037457/)
IMG_4465 (http://www.flickr.com/photos/97860410@N03/9143037457/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm6.staticflickr.com/5483/9145269616_8439fbc454.jpg (http://www.flickr.com/photos/97860410@N03/9145269616/)
IMG_4464 (http://www.flickr.com/photos/97860410@N03/9145269616/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

hydrovac
21-07-2013, 03:53
Assembling of PCB s almost done, trying to place them in the chassis.
http://farm4.staticflickr.com/3670/9326896212_68d8a073a4.jpg (http://www.flickr.com/photos/97860410@N03/9326896212/)
IMG_4617 (http://www.flickr.com/photos/97860410@N03/9326896212/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm4.staticflickr.com/3798/9324125493_6231c7e3b7.jpg (http://www.flickr.com/photos/97860410@N03/9324125493/)
IMG_4616 (http://www.flickr.com/photos/97860410@N03/9324125493/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm3.staticflickr.com/2823/9326880170_8ce4965717.jpg (http://www.flickr.com/photos/97860410@N03/9326880170/)
IMG_4618 (http://www.flickr.com/photos/97860410@N03/9326880170/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm8.staticflickr.com/7343/9106822192_523117b50f.jpg (http://www.flickr.com/photos/97860410@N03/9106822192/)
IMG_4311 (http://www.flickr.com/photos/97860410@N03/9106822192/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

Mounted them, power supply wiring done and commissioned.

http://farm4.staticflickr.com/3793/9107362762_71696dbf8c.jpg (http://www.flickr.com/photos/97860410@N03/9107362762/)
IMG_4367 (http://www.flickr.com/photos/97860410@N03/9107362762/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

realysm42
21-07-2013, 08:26
Neat work, how do they sound?

hydrovac
22-07-2013, 17:12
Holes for output devices drilled on heat sinks using a TO3 jig. Input and speaker binding posts holes done and connectors mounted.

http://farm6.staticflickr.com/5341/9143084385_0a76df9474.jpg (http://www.flickr.com/photos/97860410@N03/9143084385/)
IMG_4448 (http://www.flickr.com/photos/97860410@N03/9143084385/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm4.staticflickr.com/3667/9105146409_93deef27be.jpg (http://www.flickr.com/photos/97860410@N03/9105146409/)
IMG_4366 (http://www.flickr.com/photos/97860410@N03/9105146409/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm8.staticflickr.com/7413/9198018337_4b6909e77c.jpg (http://www.flickr.com/photos/97860410@N03/9198018337/)
IMG_4556 (http://www.flickr.com/photos/97860410@N03/9198018337/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm6.staticflickr.com/5459/9148687341_3dca54af22.jpg (http://www.flickr.com/photos/97860410@N03/9148687341/)
IMG_4481 (http://www.flickr.com/photos/97860410@N03/9148687341/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

This is the den for our hobby & passion, and where all our classics come to life.

http://farm6.staticflickr.com/5515/9105258155_cf9ebf6b1e.jpg (http://www.flickr.com/photos/97860410@N03/9105258155/)
IMG_4399 (http://www.flickr.com/photos/97860410@N03/9105258155/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm6.staticflickr.com/5484/9105264799_bb7aae8da5.jpg (http://www.flickr.com/photos/97860410@N03/9105264799/)
IMG_4398 (http://www.flickr.com/photos/97860410@N03/9105264799/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm6.staticflickr.com/5472/9105273247_08f38f0855.jpg (http://www.flickr.com/photos/97860410@N03/9105273247/)
IMG_4397 (http://www.flickr.com/photos/97860410@N03/9105273247/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm4.staticflickr.com/3745/9107511104_fc320f4c7f.jpg (http://www.flickr.com/photos/97860410@N03/9107511104/)
IMG_4396 (http://www.flickr.com/photos/97860410@N03/9107511104/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm8.staticflickr.com/7343/9106790234_2e6ec54c8e.jpg (http://www.flickr.com/photos/97860410@N03/9106790234/)
IMG_4315 (http://www.flickr.com/photos/97860410@N03/9106790234/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm8.staticflickr.com/7326/9104570287_1161683312.jpg (http://www.flickr.com/photos/97860410@N03/9104570287/)
IMG_4314 (http://www.flickr.com/photos/97860410@N03/9104570287/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm4.staticflickr.com/3700/9106805916_3c8e63c47a.jpg (http://www.flickr.com/photos/97860410@N03/9106805916/)
IMG_4313 (http://www.flickr.com/photos/97860410@N03/9106805916/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr


Power transistors mounting process and progress.

http://farm8.staticflickr.com/7385/9239820600_a315b42037.jpg (http://www.flickr.com/photos/97860410@N03/9239820600/)
IMG_4420 (http://www.flickr.com/photos/97860410@N03/9239820600/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm8.staticflickr.com/7407/9237087447_96d4daa072.jpg (http://www.flickr.com/photos/97860410@N03/9237087447/)
IMG_4412 (http://www.flickr.com/photos/97860410@N03/9237087447/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm4.staticflickr.com/3796/9237095947_092879ee43.jpg (http://www.flickr.com/photos/97860410@N03/9237095947/)
IMG_4409 (http://www.flickr.com/photos/97860410@N03/9237095947/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm8.staticflickr.com/7446/9237056051_5257368ee0.jpg (http://www.flickr.com/photos/97860410@N03/9237056051/)
IMG_4416 (http://www.flickr.com/photos/97860410@N03/9237056051/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm4.staticflickr.com/3715/9237071051_a722430b12.jpg (http://www.flickr.com/photos/97860410@N03/9237071051/)
IMG_4414 (http://www.flickr.com/photos/97860410@N03/9237071051/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm8.staticflickr.com/7407/9237087447_96d4daa072.jpg (http://www.flickr.com/photos/97860410@N03/9237087447/)
IMG_4412 (http://www.flickr.com/photos/97860410@N03/9237087447/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm8.staticflickr.com/7311/9145304868_4f366ae612.jpg (http://www.flickr.com/photos/97860410@N03/9145304868/)
IMG_4449 (http://www.flickr.com/photos/97860410@N03/9145304868/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm8.staticflickr.com/7364/9145324772_a175969774.jpg (http://www.flickr.com/photos/97860410@N03/9145324772/)
IMG_4442 (http://www.flickr.com/photos/97860410@N03/9145324772/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

hydrovac
24-07-2013, 06:53
Neat work, how do they sound?

Thanks realysm42,

The prototype sounded really pure with low noise floor. Even audiophile grade prompting me to build one with soft start and speaker protection against DC.

The specs are as below:

POWER OUTPUT: 200W rms/8 ohm
310W rms/4 ohm
800W rms/8 ohm (Bridge mode)
FREQUENCE RESPONSE: 20HZ-20KHZ +/-0.5dB
INPUT SENSITIVITY: 1V for 200W/300W
HUM AND NOISE: -105dB
THD: <0.1%
DAMPING FACTOR: 65

hydrovac
26-07-2013, 05:56
Hooking up output devices to PCB s.


http://farm3.staticflickr.com/2838/9237048033_282cee0477.jpg (http://www.flickr.com/photos/97860410@N03/9237048033/)
IMG_4419 (http://www.flickr.com/photos/97860410@N03/9237048033/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm4.staticflickr.com/3813/9145328056_79cd486a09.jpg (http://www.flickr.com/photos/97860410@N03/9145328056/)
IMG_4441 (http://www.flickr.com/photos/97860410@N03/9145328056/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm8.staticflickr.com/7401/9145316664_4786c1dd2f.jpg (http://www.flickr.com/photos/97860410@N03/9145316664/)
IMG_4447 (http://www.flickr.com/photos/97860410@N03/9145316664/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm4.staticflickr.com/3815/9200853494_57ffb98bdd.jpg (http://www.flickr.com/photos/97860410@N03/9200853494/)
IMG_4551 (http://www.flickr.com/photos/97860410@N03/9200853494/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm8.staticflickr.com/7413/9198018337_4b6909e77c.jpg (http://www.flickr.com/photos/97860410@N03/9198018337/)
IMG_4556 (http://www.flickr.com/photos/97860410@N03/9198018337/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm4.staticflickr.com/3730/9197972401_a3b39774c3.jpg (http://www.flickr.com/photos/97860410@N03/9197972401/)
IMG_4561 (http://www.flickr.com/photos/97860410@N03/9197972401/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

http://farm3.staticflickr.com/2866/9197958923_767ce44355.jpg (http://www.flickr.com/photos/97860410@N03/9197958923/)
IMG_4562 (http://www.flickr.com/photos/97860410@N03/9197958923/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

hydrovac
02-08-2013, 11:05
Hi friends,

Sorry for the long gap in my post as I was preoccupied with other commitments. In continuation to my earlier posts, here is progress in amp build.
Checking the DC rail voltages: Left channel, Right channel, both channels

http://farm8.staticflickr.com/7371/9419484581_508346b9fc.jpg (http://www.flickr.com/photos/97860410@N03/9419484581/)
IMG_4645 (http://www.flickr.com/photos/97860410@N03/9419484581/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr
http://farm4.staticflickr.com/3674/9419479649_bc9934fe2f.jpg (http://www.flickr.com/photos/97860410@N03/9419479649/)
IMG_4646 (http://www.flickr.com/photos/97860410@N03/9419479649/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr
http://farm4.staticflickr.com/3754/9419469465_97eeb92bb9.jpg (http://www.flickr.com/photos/97860410@N03/9419469465/)
IMG_4648 (http://www.flickr.com/photos/97860410@N03/9419469465/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

Checking full rail voltages: Left channel, Right channel, - Ve and +Ve rails

http://farm6.staticflickr.com/5346/9419445683_4d239f1c7d.jpg (http://www.flickr.com/photos/97860410@N03/9419445683/)
IMG_4652 (http://www.flickr.com/photos/97860410@N03/9419445683/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr
http://farm4.staticflickr.com/3717/9419425229_408806ea22.jpg (http://www.flickr.com/photos/97860410@N03/9419425229/)
IMG_4653 (http://www.flickr.com/photos/97860410@N03/9419425229/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr
http://farm6.staticflickr.com/5344/9419413121_8bfba7eaf3.jpg (http://www.flickr.com/photos/97860410@N03/9419413121/)
IMG_4655 (http://www.flickr.com/photos/97860410@N03/9419413121/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

I am supposed to get around +62 and -62 volts DC on rails. The increase in reading is because of the mains input voltage (250 volts AC). Toroidal transformer winding is rated for 230 volts primary.

http://farm8.staticflickr.com/7387/9421950580_eed0cc58c9.jpg (http://www.flickr.com/photos/97860410@N03/9421950580/)
IMG_4682 (http://www.flickr.com/photos/97860410@N03/9421950580/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr
http://farm6.staticflickr.com/5447/9419177707_9efae47912.jpg (http://www.flickr.com/photos/97860410@N03/9419177707/)
IMG_4686 (http://www.flickr.com/photos/97860410@N03/9419177707/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr
http://farm6.staticflickr.com/5481/9419184065_9749aa62b9.jpg (http://www.flickr.com/photos/97860410@N03/9419184065/)
IMG_4683 (http://www.flickr.com/photos/97860410@N03/9419184065/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

Setting the quiescent bias current for output stage:
Fabricated a 10 ohm 5 watt wire wound resistor suitable for the fuse holder.

http://farm8.staticflickr.com/7454/9422025478_25bfbd6d3d.jpg (http://www.flickr.com/photos/97860410@N03/9422025478/)
IMG_4671 (http://www.flickr.com/photos/97860410@N03/9422025478/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr
http://farm4.staticflickr.com/3714/9422005222_6a58ac2d93.jpg (http://www.flickr.com/photos/97860410@N03/9422005222/)
IMG_4674 (http://www.flickr.com/photos/97860410@N03/9422005222/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

Inserted in +Ve side holder and switched on the power. Adjusted the trim pot to get, 1.0 volt across the resistor.

http://farm6.staticflickr.com/5545/9422140554_97f1ae28c5.jpg (http://www.flickr.com/photos/97860410@N03/9422140554/)
IMG_4658 (http://www.flickr.com/photos/97860410@N03/9422140554/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr
http://farm4.staticflickr.com/3798/9419329303_e23b1f0453.jpg (http://www.flickr.com/photos/97860410@N03/9419329303/)
IMG_4660 (http://www.flickr.com/photos/97860410@N03/9419329303/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr
http://farm8.staticflickr.com/7419/9419323391_e4c9cc8671.jpg (http://www.flickr.com/photos/97860410@N03/9419323391/)
IMG_4661 (http://www.flickr.com/photos/97860410@N03/9419323391/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr
http://farm8.staticflickr.com/7284/9422075152_0d7e8e30a4.jpg (http://www.flickr.com/photos/97860410@N03/9422075152/)
IMG_4662 (http://www.flickr.com/photos/97860410@N03/9422075152/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr
http://farm8.staticflickr.com/7343/9419396369_9e7374a9a1.jpg (http://www.flickr.com/photos/97860410@N03/9419396369/)
IMG_4657 (http://www.flickr.com/photos/97860410@N03/9419396369/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr
http://farm4.staticflickr.com/3686/9422106362_e690c0c3c1.jpg (http://www.flickr.com/photos/97860410@N03/9422106362/)
IMG_4659 (http://www.flickr.com/photos/97860410@N03/9422106362/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

You can see the thermal sensing bias transistors mounted mid way between the power transistors on the heat sink. Good going so far.

http://farm8.staticflickr.com/7335/9421985866_468bca0209.jpg (http://www.flickr.com/photos/97860410@N03/9421985866/)
IMG_4678 (http://www.flickr.com/photos/97860410@N03/9421985866/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr
http://farm6.staticflickr.com/5327/9421956890_6162d8aba5.jpg (http://www.flickr.com/photos/97860410@N03/9421956890/)
IMG_4680 (http://www.flickr.com/photos/97860410@N03/9421956890/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr
http://farm4.staticflickr.com/3817/9419206723_65636b5252.jpg (http://www.flickr.com/photos/97860410@N03/9419206723/)
IMG_4679 (http://www.flickr.com/photos/97860410@N03/9419206723/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

Now, looking at output side. Measuring the speaker output terminals for DC.

http://farm4.staticflickr.com/3687/9419282933_ca65034520.jpg (http://www.flickr.com/photos/97860410@N03/9419282933/)
IMG_4669 (http://www.flickr.com/photos/97860410@N03/9419282933/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr
http://farm6.staticflickr.com/5550/9422049930_32390e80d0.jpg (http://www.flickr.com/photos/97860410@N03/9422049930/)
IMG_4668 (http://www.flickr.com/photos/97860410@N03/9422049930/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr
http://farm6.staticflickr.com/5493/9419295793_9eee955614.jpg (http://www.flickr.com/photos/97860410@N03/9419295793/)
IMG_4667 (http://www.flickr.com/photos/97860410@N03/9419295793/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

Left channel looks clean without any DC. But right channel is showing 0.04 volts. There seems to be a hitch somewhere. I will get back with updates after trouble shooting.
Thanks for looking and following the post.

337alant
02-08-2013, 16:53
Nice job ;) have you had a listen yet?.
40mv dc offset isnt that bad both of mine are 20-30mv could be a slightly leaky cap try C7. I would have used 0.1% precission matched all the resistors in the ist stage as well.
Not sure I understand the method of setting the Bias current ? normally its a mv reading accross the emitter resistors or disconnect the +ve lead to the board and measure the total current draw (unloaded output) in ma

Alan

hydrovac
03-08-2013, 07:57
Nice job ;) have you had a listen yet?.
40mv dc offset isnt that bad both of mine are 20-30mv could be a slightly leaky cap try C7. I would have used 0.1% precission matched all the resistors in the ist stage as well.
Not sure I understand the method of setting the Bias current ? normally its a mv reading accross the emitter resistors or disconnect the +ve lead to the board and measure the total current draw (unloaded output) in ma

Alan


Hi Alan,

Thanks for that. I replaced the C7 cap with a new one and now its reading 1.5 mv on right ch and 2.8 Milli volts left ch, in 200mv range of multimeter. Shouldn't this be zero volts? Can I connect the speaker in a condition like this?

The author suggested to setup the Bias as shown in the link.
http://users.otenet.gr/~athsam/300w.htm

I will have to remount the transistors and give it a listening test.

337alant
03-08-2013, 15:03
Your Dc offset is excellent and will not damage your speakers dont worry ;)
Mine ar 30ma in both channels as I use a Mil spec wet tants in the feed back position and they are a bit leaky as well but it still will do no damage if mine goes over 50ma I will change the caps but many say as high as 100ma is still OK.

Alan

istari_knight
18-10-2013, 15:53
ITS ALIVE !!!

http://www.fun-machine.com/wp-content/uploads/2012/10/ItsAlive.jpg

Finally got around to fitting new CCD's & the B4 lives :wowzer:

http://farm8.staticflickr.com/7413/10347189963_ff7b2b16dc_b.jpg (http://www.flickr.com/photos/87920837@N06/10347189963/)

As you can see I paid special attention to the wiring :lol: :upyours:

realysm42
18-10-2013, 16:09
What is it?

istari_knight
18-10-2013, 16:46
What is it?

A preamp... Sort of !

Technically its a buffer with a potentiometer on the input. Supposed to be the best of both worlds, with the transparency of a passive pre-amp and the drive of a good active pre-amp... I cant comment either way yet as I've only just got the thing working - If you see this Rob [Puffin] the fault was the CCD's, they were working but letting far too much current through [as much as 30X too much in one case!]

Puffin
18-10-2013, 18:17
Yes, the curse of shitbay! Glad you got it sorted. Let us know what it sounds like in due course.

istari_knight
18-10-2013, 19:25
Yes, the curse of shitbay! Glad you got it sorted. Let us know what it sounds like in due course.

Indeed ! Will do :thumbsup: ... 3 albums in, so far so good :D

337alant
04-11-2013, 17:07
Nice B4 glad you got it working
I use one myself and they are neutral and transparent after a couple of weeks left switched on 24/7 :eyebrows: but get t in a box first so its safe.

Alan

istari_knight
04-11-2013, 19:47
Nice B4 glad you got it working
I use one myself and they are neutral and transparent after a couple of weeks left switched on 24/7 :eyebrows: but get t in a box first so its safe.

Alan

Cheers :)

It wasnt all plain sailing though ! I Originally got the board from Rob fully populated but not working & with significant track damage around the volume pot... Managed to get it working with new CCD's & thought I fixed the tracks but they were just too far gone & channels would randomly cut in & out :( So I robbed all the components off the PCB & fitted them to a new B4 board.

Extended listening showed it to be dynamically squashed & it just seemed to steal the fun out of music. I discovered this was down to the standard BOM quoting naff values... I followed it & had R5=10k/C5=1uF which as confirmed by PD gives a 10ms time constant, 3dB rolloff at 16Hz [audible loss of deep bass.] I've now jumpered the input & output caps and fitted 5K trimmers @ R3/R103 adjusting the offset to 0vdc. It now sounds absolutely fantastic... If your power amp has input coupling caps you really should remove them from the B4 ! ... If keeping the 1uF input caps you can change R5/R105 to 30k which will fix the bass issues.

I've got all the bits to build it into an acrylic case but as always just cant seem to get 'round to it !

Puffin
04-11-2013, 20:07
You Da Man! Well done.

337alant
06-11-2013, 08:29
Yes the CCds are probably the most common cause of failure to the board, I also changed my R5 for 25k / C5 1uf NOS Russian polysyrene, still have an output cap (wet Tant) in there and I will get round to experimenting with removing it eventually, but anyway glad you got there in the end
The modushop.biz cases are very nice

Alan

TMaudio
04-12-2016, 21:16
Hello, check out my first diy project! My vision was to create 2.1 sound system with amplifire, which will not only fill the room with good sound, but also to be a work of art. What do you think?:)

https://www.youtube.com/watch?v=4Gby6F9yBds

walpurgis
04-12-2016, 22:16
Nice job Tilen.

TMaudio
08-12-2016, 19:57
Thank you walpurgis!

karma67
15-01-2017, 20:15
nice work,although all i keep thinking of when i watch the video is the roof of a ford granada! :eek:

Ian7633
15-01-2017, 20:22
nice work,although all i keep thinking of when i watch the video is the roof of a ford granada! :eek:

Or that " special " outfit you have :D

337alant
27-01-2017, 19:02
Latest DIY Project was an upgraded power supply for the paradise phono stage, Using Simons transformer boards which takes a common mode choke as well, in the minicap6 board is a Hammong 158T choke and a power resister bolted to the base plate under the board, The smoothing caps are BHC 220uf 50V, smoothing is configured in CRCLC sequence.
Certainly a worthwhile improvement over the original :eyebrows:.



https://c1.staticflickr.com/1/583/32373658645_3252c50e91_b.jpg (https://flic.kr/p/RjKsQn)IMG_2946 (https://flic.kr/p/RjKsQn) by Alan Towell (https://www.flickr.com/photos/69508926@N05/), on Flickr

https://c1.staticflickr.com/1/346/32382547475_b2262836fd_b.jpg (https://flic.kr/p/Rkx2b4)IMG_2949 (https://flic.kr/p/Rkx2b4) by Alan Towell (https://www.flickr.com/photos/69508926@N05/), on Flickr

Alan

fatmarley
28-01-2017, 00:21
Hello, check out my first diy project! My vision was to create 2.1 sound system with amplifire, which will not only fill the room with good sound, but also to be a work of art. What do you think?:)

Only just spotted this. Excellent build and video :)

Are they Visaton woofers?

TMaudio
10-04-2017, 18:53
fatmarley, im so sorry for late reply didnt see the post :/ Yes they are W170 S :)

sq225917
10-04-2017, 21:30
Blimey not much traffic on this thread. Here's a pair of output buffer boards minus output devices.

https://c2.staticflickr.com/4/3956/33928059275_248e5f7532_b.jpg

YNWaN
11-04-2017, 09:28
Lovely job, that reminds me though, must get round to fitting my air-cored inductors to my boards....

Marra
11-04-2017, 14:19
My latest build is the Salas DCG3 headphone/preamp. Built on a plank of wood for testing purposes but now housed in a lovely Modushop chassis and sounding very nice. One of the best things I have built actually. Well pleased.

http://i867.photobucket.com/albums/ab236/Marra49_photos/DSC_0836_zps4wzrytyj.jpg (http://s867.photobucket.com/user/Marra49_photos/media/DSC_0836_zps4wzrytyj.jpg.html)

http://i867.photobucket.com/albums/ab236/Marra49_photos/DSC_0004_zpsbcytqpma.jpg (http://s867.photobucket.com/user/Marra49_photos/media/DSC_0004_zpsbcytqpma.jpg.html)

http://i867.photobucket.com/albums/ab236/Marra49_photos/DSC_0011_zpsskhbrz8q.jpg (http://s867.photobucket.com/user/Marra49_photos/media/DSC_0011_zpsskhbrz8q.jpg.html)

337alant
11-05-2017, 21:55
Looks excellent Marra :eyebrows:
Are those Avel Lindberg or nuvotem potted transformers :eyebrows:

Alan

Marra
12-05-2017, 07:08
Thank you Alan. I am very much enjoying this pre.

The transformers are Novetem's.

Good to hear that you are enjoying the improvements that Simon's boards bring to the Paradise.

sq225917
29-08-2017, 20:35
I've been building a little chipamp.

https://c1.staticflickr.com/5/4407/36845820285_a79d838ce7_b.jpg

Actually they're not that little. That's about 250mm deep, 180mm high and 240mm wide.

Weighs a shit tonne as well. 110w a side into 4 ohms.

Pete812
02-07-2020, 02:55
A few photos of my phono stage that I assembled over a year ago now, sounds good too.
https://i.ibb.co/XzWYKr8/Muffsy04.jpg
https://i.ibb.co/Bg6qmPf/Muffsy05.jpg
https://i.ibb.co/b5pmWsP/Muffsy02.jpg

walpurgis
02-07-2020, 08:36
Very neat, is that a kit?

Pete812
02-07-2020, 08:56
Very neat, is that a kit?

Yes, complete from muffsy.com.
Quite easy to solder together, all instructions on the website; although they don't send you any info the web page is great.

Batty
02-07-2020, 08:59
28027

Speaker build in progress.

Sansiiro
11-07-2020, 09:29
Hello!

I have took the time and made this sound panel for my system (see the photos) (click to enlarge):

2808628087

Speaking of any issue or improvement in the hi-fi realm, there is a golden suggestion - trust your ears.
However, sometimes the improvement can be very small, theoretical, and will not be heard due to low quality of surrounding system.

This is why I am asking for your opinion on the matter of this panel. As you see, it is between the speakers where I have the cabinet for the TV, which can be lifted up. Before I had a flat (plastic) surface there, but decided to fight the reflections.
But to come to think of it, all the surfaces on the panel are still flat, and shoot straight back to the listening position.

I think it will deal better with reflections coming from the sides, but as the main-bounce is between speakers and the crossing wall (behind listeners back) I feel that perhaps I did not think it through, and should have went for a pyramid shaped surfaces (rather than a square shaped) on the wall between speakers.

Do you believe that this panel will tackle the straight reflections at all?
Or will it simply distort the reflection, not really improving the situation?

Puffin
11-07-2020, 16:19
I would have a look at the many internet sites that deal with speaker positioning and the direction of travel of sound. I am not sure that where you have the panel would provide any refraction. Sound bounces off the walls, floor, ceiling.

Sansiiro
11-07-2020, 16:53
I thought it bounced off from everything.... much like the light

VintageStereo
16-09-2020, 08:42
Some Lenco in totally new clothes. We made custom made the body from the aluminium cast, upgraded bearing, slightly modyfied turntable control. For sure the plinth is a brand new custom made as well...:)
With body construction and design, we worked together with those guys...: https://tommy-sons.com/en/

Alex66
05-05-2021, 11:45
29430
PCM1798 DA Scratch built apart from the input receiver board and the DA chip was bought pre mounted. Circuits applied from previous experiments and deviations from suggested aplications.

Puffin
05-05-2021, 14:50
Not enough caps for my liking :)

https://i.imgur.com/UVIQCC7.jpg

sailor
20-05-2021, 20:28
This was put together mainly to avoid having to buy expensive plugs allowing me to spend the money saved on quality off-the-reel cable and IEC plugs.

https://i.imgur.com/v8slfnS.jpg

https://i.imgur.com/mpSI5x4.jpg

https://i.imgur.com/Z9fA1of.jpg

https://i.imgur.com/eq4nqfc.jpg

https://i.imgur.com/2kgkUlQ.jpg

I will build another when I finally get the damp leaking house sorted which is seriously messing with my audio pursuit :(

Instead of wood I'll use phenolic resin (bakelite), make it a bit bigger and use FUREZ pure copper lugs. Instead of 6mm stainless steel nuts and bolts will go to 8mm high tensile so I can really torque the hell out of them. Most importantly, try and find some quality glands. Nothing available in my area so got from Amazon, big mistake using Chinese rubbish! I have 7 glands mounted on the top and 5 on the bottom which is a little cramped and one of the glands failed. The threaded section stripped and I was taking great care. This happened when swapping power cables.

The unit is not fed by a master cable, I removed an existing wall socket and mounted this over the pattress.

I only need 7 cables but fitted extra so I could listen to the sound of each. Finding the best and worst was easy now with my gizmo. Top cable, easily heard and a good deal above the rest was a DIY Oyaide Black Mamba V2. I have 2 fitted, one with an MPS Hercules which proved excellent value and the other with a Furutech knock-off. The Black Mamba with Furutech was top of the bunch.

Of note the BM V2 was best on the linestage, DAC and Bryston player, which makes it unusually versatile. Also worth noting is the fact that the comparison between the 2 BM cables was revealing the difference between the IEC plugs. The 2 cables were made by cutting a 3m length in half so the difference can't be attributed to a new run or even one of them reverse direction. Both cables had the cable ID reading from supply to device. The plugs are as or more important than the wire.

The least of them and on the Bryston actually sounded phasey and soft. The MCRU No.75
This finding is on my system in my room and might be better in a different situation :scratch:

Marco
23-05-2021, 18:50
Interesting, Charles.. Could we see it all cabled-up?:)

Marco.

Barry
23-05-2021, 19:20
What is the base made from - is it wood, or SRBP?

MartinS
24-05-2021, 20:46
I will state from the outset that I am a total sceptic about claims that changing a mains cable will have any discernable impact on the performance of an item of audio equipment, with the important proviso that any cable should not change the voltage or frequency of the supply and allow the required power to be supplied. If sound is actually altered as a result then something within the laws of physics has been changed which is both demonstrable and therefore measureable. If someone cares to explain why scientifically I would be most interested, I can hear a difference is not acceptable, even though you might be convinced that you can. I believe the ear and by extension the brain are probably the least reliable tools to measure change in electronic audio equipment performance.

I acknowledge Charles' exercise in identifying a specific mains cable that he thinks he prefers and whilst I recognise his entitlement to spend his time and money in whichever way he chooses, I have already made my position clear.

I note that Charles lives in Ireland, their electrical installation regulations are broadly the same as the UK and both would find his home built unit contrary to the regs, there appears to be class 1 metalwork not connected to a CPC, the 25A MCB is not providing any over current or short circuit protection to the individual out going cables, access to live components doesn't require use of a tool, and timber is a dubious choice as a housing material. Given these comments connecting it to a fixed electrical installation would almost certainly invalidate the buildings insurance, wholly not recommended.
I am most certainly in favour of trying alternative whatevers if that's your choice, but just about everything else before the mains cables will have a far greater impact and your less likely to burn the house down or worse kill yourself.
A somewhat concerned Martin

sailor
24-05-2021, 20:54
Marco, here you go, even took the lid off.

Barry it's wood. I come from the other side of the equator and have never heard of SRBP. It's a very hard wood which holds it's shape well and machines nice and clean. The locals I've asked don't know it.

https://i.imgur.com/UyAzcyo.jpg

https://i.imgur.com/7TcAJKv.jpg

https://i.imgur.com/r2HQeZC.jpg

Barry
24-05-2021, 21:53
SRBP - Synthetic Resin Bonded Paper, also known as Paxolin. It comes in two grades: P1 and P3. P3 is a very good insulator and would be used at mains voltages.

I wouldn't trust wood (even a fine-grained hardwood) to be a suitable insulator for the mains voltage used in Europe.

sailor
25-05-2021, 07:56
Martin, I appreciate the time you took to reply but I am concerned that you are concerned. Concerned that you unfortunately have not heard what a good cable can bring to the party. Concerned that you are a 'measurementalist' and probably have never even tried the experiment.

This was my experiment to not only avoid costly mains plugs but also to avoid the sound of those plugs with accompanying fuses. The improvement from lowering the noise floor was impressive.

I did mention that I will at some stage rebuild it using phenolic resin board but mainly to achieve a bit more space using fewer cables. I need 7 cables but allowed for more so that I could easily swap them around which I have been doing and learning a lot.

Regarding not needing a tool to open the unit, I invite you to pop over and attempt to undo them with your fingers. Bring a bottle of single malt with and while you are here I could unplug the DAC, pre and power amps and supply them from an extension block using standard supplied cables. I have done this and the difference is undeniable. If you can't hear anything then you can also be concerned about your hearing.

Perhaps you can explain to me how you can tell how tight those wing nuts are from inspecting a photo :rolleyes: Did you not notice the nyloc nuts as back up on the buss-bar mounts? When swapping in new cables the wing nuts are convenient but nylocs are used at other times. You appear to have made the assumption that the cover is easily removable.

Please do not be concerned about my safety, I have been working with high voltage for a looong time.

Cherry
08-03-2023, 12:25
Some projects done

All using TPA3255 modules from 3e Audio


https://flic.kr/s/aHBqjzBmTW
https://flic.kr/s/aHBqjzBmTW

My latest -https://flic.kr/s/aHBqjAuYd7
https://flic.kr/s/aHBqjAuYd7