I sent him the picture from here so he sees how much lateral room there is.. I don't know crap, but maybe the filter can end up on the side of the op amp instead of sitting on top.
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I sent him the picture from here so he sees how much lateral room there is.. I don't know crap, but maybe the filter can end up on the side of the op amp instead of sitting on top.
The pins used on the Browndogs would probably be more suitable http://cimarrontechnology.com/so8to8...rpn970601.aspx
The pins with the black plastic are a lot taller
If it was me I'd just remove the 8pin socket and solder the 4032 converter board direct to the pcb, to save headaches just use the lm4562, it may not be quite as good but be less hassle for those unable to sort the space issue out
I for another don't think it was a gravy train issue. We've all been trying different "modifications" out over the months with varying degrees of success, some DIY, some getting the "DIY done for us". I guess at the end of the day the profit margin on the 4032s that Tirna have been selling must have been a few quid each. If he sold twenty then that's probably enough for a tank of petrol never mind a Rolls Royce.
OK guys, here are a couple of pictures showing the "original" BrownDog adapter which I used to mount the THS4032 and ceramic capacitor:
http://farm4.static.flickr.com/3556/...aa01dd.jpg?v=0
http://farm4.static.flickr.com/3244/...ebf3a7.jpg?v=0
Here is the adapter with the chip and cap fitted:
http://farm4.static.flickr.com/3322/...df015a.jpg?v=0
The distance from the underside of the adapter to the top of the capacitor is 5.5mm - So when it is installed in the TC-7520 socket(s) there is ample clearance between the cap and the case cover.
What I have also done is removed the sub-pcb by cutting away all the hot-melt gunge and sticky pad and trimmed all the component leads to allow the pcb to sit slightly (abot 2mm) lower. Of course I insulated the 2 caps on the main board with bits of tape before re-fitting the sub-pcb. There were also one or two solder joints I re-flowed to allow me to seat a couple of components firmer.
Hope this is of some use.
Ken
That's much more like it Ken, it's missing the black plastic feet that jack mine up those precious few mm!
I might ask Tirna to solder the whole shabang to the board and remove the socket as I'm more than happy with the 4032. I'll be dac-less for a few days but if I can get the lid back on it'll be all good.
On the subject of power supplies, here's something interesting I found last night:
Never-Connected Power supply
Unfortunately you can't buy them as a diy add-on. The manufacturer licenses out the use of the technology to other manufacturers. So perhaps this is something Stan could look into. I've go no idea on price.
Edit: I spoke to soon, you can buy these as an add-on from Trichord. You can spec the output specifications to suit your needs and they're available in black or silver. Still no mention of price though. I'll try and find out.
Not the route that I want to go down. I want to be able to try other op-amps as and when they become available. Has anyone asked Tirna whether the capacitor can be mounted to one side (if this gives enough clearance)?Quote:
Originally Posted by mwahahaha
Alternatively someone could ask Tirna to use the same type of pins as on the BrownDog version. Or, as I mentioned before, you could remove the black plastic spacers and trim the pins shorter.
Why:confused:? Are you implying their technology would offer more benefits than the Dual Power Supply circuit I designed for the TC-7510 and TC-7520? Or is this a case of jumping on someone else's bandwagon?Quote:
Originally Posted by HighFidelityGuy
I prefer to innovate, not copy others blindly, especially when I have a problem with the marketing blurb that hides the technical realities behind a product.
It's certainly not my intention to imply their design is better than yours, that is something you can investigate if you wish. You've stated yourself that the opamps supplied with the 7520 can be improved upon and that the PSU supplied with the 7520 can be improved upon. I'm simply bringing a possible alternative to a standard PSU to everyone's attention. It's up to you and everyone else to decide if it's worth trying or not.Quote:
Originally Posted by Sensimilia
Just for clarification. When I say the PSU of the 7520, I'm talking about the transformer that plugs in the mains. Not the internal PSU of the 7520.
Are the black plastic spacers easy to remove?Quote:
Originally Posted by HighFidelityGuy
Is it just a case of prying the spacers off the pins then snipping back the pins so they are shorter?
*Are the spacers NEEDED for elecrical insulation purposes or whatever?
(no soldering/electronics ability here WHATSOEVER!)
thanks!
I think it should be that easy. I've not received mine through the post yet so I can't say for sure. However I've soldered those pin headers to PCB's before and it's been a pain to stop the pins from moving in and out of the spacer and ending up different lengths. So they should slide off fairly easily. They probably will be a bit tighter than before the pins are soldered in place though due to the added friction of all the pins being stationary. I'll try it out on mine when they arrive.Quote:
Originally Posted by Gazjam
I know the NCPSU used in the Trichord stuff, infact I could easily draw out the circuit but won't :ner:
Regarding those pin sockets with the plastic on, I don't think removing the plastic is going to help I'm afraid chaps, I'm pretty sure the pins covered in that plastic is too thick to go through the converter board holes anyway, feel free to check just to be sure though:)
I have a brown dog type converter and one using the pins with plastic collars on so will post a pic later of them side by side, theres quite a difference in height.
These are currently in other gear (DC servo for an amp and a simple linestage) so I'll have to take them out first
So do I, and I consider it inferior to the Virtual Battery circuit from Technics or the power supply circuit from JL Hood.Quote:
Originally Posted by leo
Your right Leo, my Tirna chips have just arrived and I've compared them next to my BrownDog adapter boards. The pins that Tirna have used are much longer. Also, the section of the pin that's covered by the black plastic spacers is much thicker than the part of the pin that fits in the socket. So even if you managed to remove the spacers and cut the pins shorter you could only loose about 1mm of the height. :(Quote:
Originally Posted by leo
So with the Tirna boards I think the only two options are to either remove the IC socket from the 7520 or swap the pins on the adapter board for some shorter ones like those used on BrownDog boards. :(
As I have both adapter board types I guess I could swap the pins from the BrownDog boards onto the Tirna ones if the PCB holes are the same size. I'll probably try this eventually but for now I'll use the Tirna ones as they are to try them out.
Edit: Here are a couple of photos I've just taken of the two adapter boards side by side. Sorry about the crappy quality, my phone camera sucks.
http://i2.photobucket.com/albums/y48.../Adapter01.png
http://i2.photobucket.com/albums/y48.../Adapter02.png
Good God I thought my eyes had gone. :lol:
I know, they're terrible. :doh: Hopefully it will give everyone a rough idea of the massive difference in height between the two. The pins aren't anywhere near as thick as they look there, that's just bloom or whatever you call it caused by the crappy camera and the harsh lighting.
Excellent, Cheers!Quote:
Originally Posted by HighFidelityGuy
:)
*EDIT*
Bugger
Daft question alert...
Meantime, would the case lid sitting on the cap (not much weight) do any harm? Any electrical probs?
It wouldnt be a permenant situation.
Well I never said it was the best, for me Paul Hynes has taken first placeQuote:
Originally Posted by Sensimilia
The NCPS is quite a simple circuit, its pretty effective but the prices are a little too much for what you get
I know most of the JLH stuff including the gadget plugged into the output of regulators :)
Having a bad day Stan? ;)
Is this pic any clearer;)
Looking back at the other pic it seems the pins Tirna use are even longer than these
http://pic20.picturetrail.com/VOL129.../360820197.jpg
Can't really do any better than the email I just had from Alan@Tirna -
"Hi,
A customer of ours has pointed out that the Dual Op amp Beresford DAC upgrade does not allow the Beresford case to close on it, the adaptor is sitting too high.
If you have a problem with it fitting in the case, please return it to us, and we will try to solve the problem (which we are working on now).
We will refund the cost of sending it to us through PayPal, and if we cannot solve the problem than we will issue a full refund of the original amount paid.
We apologize for any inconvenience caused,
Regards,
Alan Dripps,
Tirna Electronics Ltd."
More info on the Tirna 4032 package:
I emailed them today after I received my chips and explained the situation to them. They replied and said that they are holding all current orders and asking people who have received their order to send it back. They also said that they have sent me a modified version with shorter pins and the cap mounted on the back. I'm going to liaise with them to help them perfect the design. I'll post more details when I get the new version. :)
Edit: Opps, must remember to refresh page before posting. Thanks Dan. I guess I'm the customer Alan mentioned, cool. :)
Just got some LT1364's from Linear :(
Excellent! thanks for helping us all out by ironing out the design with them. I'll hang onto mine with the lid off until there's a new working design ready to go and then get it swapped over (Don't want to go back to the others now!)Quote:
Originally Posted by HighFidelityGuy
Thanks again
Dan
I'm currently evaluating some of these in another dac after another forum member gave them high praise.Quote:
Originally Posted by trailer
Have you tried them yourself yet?
No problem. I'm going to hang onto mine until I get the replacements. ;)Quote:
Originally Posted by mwahahaha
Give me a chance I'm just in through the door!!!!!Quote:
Originally Posted by leo
:lolsign:Quote:
Originally Posted by trailer
Breaking News just in.....
Hi,
There will be a delay of a few days in sending your order, as we are looking into a problem pointed out by a previous customer regarding clearance height of the adaptor board in the Beresford DAC.
We apologize for any inconvenience caused.
Regards,
Alan Dripps,
Tirna Electronics Ltd.
Good service I'd say! :)
Stuck them in. Just listening for the last half hour. First impressions: leaner sound, not as rich, probably more detail. It's as if someone has boosted the mid range on the EQ. I'll let them run I'm for a day or two. A different sound to the others but pretty good so far.Quote:
Originally Posted by leo
I've had the 4032's running for about 30 mins now and first impressions are very good. Definitely a bit more detail than the 49720s and what I can only describe as a more even handed sound overall. Probably not quite as much bass punch as the 49720s but I don't mind that.
I'm really looking forward to getting my new speakers now as I think the 4032's will suit them nicely. I'll still try the 49720s and the original opamps with them as well for comparison.
Listening again to the 4032's right now and they're just brilliant in my system - really tick all the right boxes and bass/mid/treble is superb - lots of each but not too much as to be overpowering in any specific area. Superb and really bring out the best in the 7520 - now just to actually get them into the 7520... (With the lid on;))
Yes have to agree the 4032 has got rid of the one note bass I found a problem and the level of detail is superb.
Tirna has e-mailed me so I will be returning the op-amp so that it can be altered to fit under the lid. They can go on my list of favourite ebay sellers.
I'm thinking about auditioning a few of the Linn DS players just out of curiosity and hopefully the Naim dac if they release it soon however they'll have a job to outshine the 7520/4032 combo (And justify the extra cost!)Quote:
Originally Posted by Covenant
i may have been banging on about it a bit, but i will just say again the majik ds is very good! sounds really good within my naim system. i would be interested in what it sounds like with the naim dac but at the mo i dont really feel its neededQuote:
Originally Posted by mwahahaha
that said the beresford closes the gap a lot more than it should do for the money and thats with the 4562's
i would love to do a comparison review within the same system but im not sure it would be much cop
just a quick pointer on the linn kit ,from what ik hear the prices go up a bloody barmy 20% 1st may
sorry to hijack the thread, i shall shh now
So, to sum up...
The "TC-7520 SE" will come with a Wolfson DAC and THS4032 op amps.
How much will it cost, Stan, and may I reserve the first one off the boat? :)
I've run the LT1364 in my modded 7510. A bit grainy right at first, needs some time to run in, then they'll smooth out. Seemed a more solid sound than the 49720 and better definition and speed than the OPA2134. Has anyone tried the AD8066 yet? I like those a lot. Superior channel separation.Quote:
Originally Posted by leo
Hey thats funny. No opamps installed in the left and right sockets but still i hear music coming from my speakers, though no sound from the headphone. Can somebody explain why?
I'll have one too.... :)Quote:
Originally Posted by technobear
'Scuse the beginner question, but do we have to give the seller any trimming instructions or just ask for the trim? (strange, I have a sudden urge to get a haircut)Quote:
Originally Posted by mwahahaha
I'd wait until we have a solution for the THS4038 case closing problem and then get those - much better than 49720's in my opinion.
Already on order from Tirna, but as its only a few quid per opamp I feel duty-bound to get a 49720 as well and compare them (I'm happy enough with my 4562s now they're run-in but got to check the others!).Quote:
Originally Posted by mwahahaha
So... trimming instructions?:please:
For those not wanting to wait or don't mind getting their hands dirty :)
http://theartofsound.net/forum/showthread.php?t=2507
Different mods on my analogue PCB
http://www.beresford.me/images/mods/apcb.jpg
My WM8716 MOD
http://www.beresford.me/images/mods/wm8716.jpg
And Stan..... Come on. Do they make a clear difference? I assume the Analogue mod is the THS4032 with some decoupling caps across 'something'
Is the DAC mod worthwhile?
Tell us more. Please.
Ade
I have no idea if it makes a difference. My test PCB has so many different changes, I have lost track of which one does what to the sound. The picture is just there for others to admire:).
lol. Very impressive!Quote:
Originally Posted by Sensimilia
Just thought I'd let you guys know that the close case mod seems to have been resolved, the cap is now under the board as opposed to above it.
Cool news.
So Tirna are sending out the revised chip/boards then?
*EDIT*
Walked into that one huh? :)