One4Audio

[Colin Wonfor]

For many years I have designed power supplies and audio equipment, but my love of music has always encouraged me to ease the whole ambients and close to the original as possible from my designs in audio.
But cost of production has sometimes made my ideas far to expensive for the majority of music lovers.
So to these ends I designed cost effective products like the Claymore by Inca Tech and Magnum by A.C.Magnum.
Now I have albeit late in life decided without constraints and conflict to produce in small runs kits for all to make as a hobby.

Many year ago I did for fun a SECA design, the component then were no way as good as you can buy now for reasonable costs. So with this in mind and the fact many of us have not got the funds to spend thousands of pounds on equipment, I have designed a KISS version that most able persons could build.

All those that have done this already have had great success, I am very proud of you all well done.:cool:

Photo of the kits are available all over the web, and I will later collate them all here, with notes.

PS Thanks Marco for this page.

[Marco]

No worries, mate. I'm sure you'll use it judiciously :)

Marco.

[Colin Wonfor]

Gentle start PCB

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xla1/t31.0-8/12241020_1516229288695430_1461835860555755000_o.jp g

Bom for PCB

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xpf1/v/t1.0-9/12247149_1516227695362256_2858353521856656519_n.jp g?oh=bac59b35b85d64935bce8d5c24863d10&oe=56D7C1B0

Circuits for PCB

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xtl1/t31.0-8/12240950_1516227708695588_1156445386815875449_o.jp g
https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xpl1/t31.0-8/12240374_1516227738695585_7164971507253154855_o.jp g

PCB Layout

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xpt1/t31.0-8/12238134_1516227748695584_3626582753526105675_o.jp g

[Marco]

Eh? :scratch:

You get out of it, what you put into it, mate. Use it as your 'shop window'...

Marco.

[Yomanze]

A price list and photos of what is available, as well as links to BOMs etc., would be very helpful.

[Colin Wonfor]

Not to well at this time will do ASAP.

http://www.hifianswers.com/2015/11/audiophile-interview-colin-wonfor-inca-tech-magnum-proac-magnum-t-o-c-a-naim-and-tellurium-q-sets-the-record-straight-part-2/

Spelling and grammar could be better.

[Colin Wonfor]

Phono MM/MC PCB with SECA headphones, similar to TQ Phono but with leaded components NOT SMD ideal DIY, POA

PCB Layout

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xfl1/t31.0-8/11056462_1519273155057710_3659234220520898857_o.jp g

PCB Circuits

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xta1/t31.0-8/12239344_1519272881724404_7664806660232429453_o.jp g

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xlf1/t31.0-8/12238471_1519272901724402_5494072518074805415_o.jp g

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xfl1/t31.0-8/12239323_1519272885057737_1211359477730712057_o.jp g

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xap1/t31.0-8/12265573_1519273025057723_4503186218558174746_o.jp g

[Colin Wonfor]

Mono SECA Kit on heat sink. In a Modshop Chassis.

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xfp1/t31.0-8/11233576_1506944909623868_3756537575094030102_o.jp g

The completed amp.

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xaf1/t31.0-8/12052564_1509938505991175_3934895828973116418_o.jp g

And inside.

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xta1/t31.0-8/12140088_1507621559556203_6571197381649261128_o.jp g

[Colin Wonfor]

FET replacement with leg twist PCB for Inca Tech Claymore.

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xfp1/v/t1.0-9/12033077_1496325794019113_3916456042568387598_n.jp g?oh=8e6f5553558bafd054a3dfd8ca4601fb&oe=56D413E6

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xat1/v/t1.0-9/12037996_1496325807352445_8765533404807898411_n.jp g?oh=58254f93050e08928b27b8ea6240653c&oe=56D46A51

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xlf1/v/t1.0-9/12032215_1496325817352444_301199000951249571_n.jpg ?oh=5d1090bd0450ee18ce5122538677b2ed&oe=56E935FE

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xtp1/v/t1.0-9/12046996_1496325850685774_5896281620426991209_n.jp g?oh=9c15dcfa5aab398e0a691173437bd829&oe=56F6A5F3

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xtp1/t31.0-8/11222219_1496325894019103_5696969334541607561_o.jp g

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xaf1/t31.0-8/12034491_1496325884019104_6557817357149302062_o.jp g

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xlp1/t31.0-8/11225281_1496325937352432_2778111842296211227_o.jp g

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xft1/v/t1.0-9/12002893_1496326107352415_3761038723222585975_n.jp g?oh=f36b3e6532379c347474648d43d3d1ff&oe=56E3E36E

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xpa1/t31.0-8/12017602_1496326144019078_994994004710435787_o.jpg

[Colin Wonfor]

SECA PCB

Please Note C4 near the Green LED is now omitted DO NOT FIT it sound much better without it.

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xta1/t31.0-8/11872145_1478655355786157_6520736114403593596_o.jp g

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xta1/t31.0-8/11894552_1478655252452834_8173960998400096901_o.jp g

[Colin Wonfor]

Paul Quick's lovely work on his SECA.

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xaf1/v/t1.0-9/1901566_10207091738636105_7735577062927882020_n.jp g?oh=20b4b893e6ac88d006294c336d5f81c1&oe=56F0ECF9

[Colin Wonfor]

Sam Barley and his SECA amp, he has never made any thing before, the son of my dear departed friend James Barley , who worked for Bartletts In London, and he sold 100s of Claymore's


The Dynamic or tracking PSU.

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xfa1/t31.0-8/1890366_1443066662678360_3461111138583379289_o.jpg

Sam looking for the red wire.

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xft1/t31.0-8/11103095_1443066639345029_2298335010046872690_o.jp g

The SECA one channel on a heatsink.

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xaf1/t31.0-8/1801132_1443066592678367_6264564688480573158_o.jpg

Both completed board 2 SECA in a old PC case.

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xtl1/t31.0-8/11202943_1443066659345027_4344049250611716765_o.jp g

Sam's write up here on HFA

http://www.hifianswers.com/2015/05/one4audio-com-the-s-e-c-a-amps-kits-the-building-process-as-experienced-by-a-novice-builder/

[Colin Wonfor]

Connections between PCB,s

With SS and PSU on a SECA

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xpl1/t31.0-8/12045384_1518540221797670_3875302107393835799_o.jp g

[Colin Wonfor]

SECA PCB

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xtf1/v/t1.0-9/12193367_1514771615507864_3112802098070294551_n.jp g?oh=ac7ec36ee05507bf4e0060db8597cadb&oe=56DBC78C

Re Fixing Zener to correct location on PCB

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xpt1/v/t1.0-9/12074783_1500955100222849_3288795018772833097_n.jp g?oh=f6c7f9aa796d5b8ed09390abab64ddc8&oe=56F85B2D

Versions without SS wiring

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xtp1/t31.0-8/12080076_1501174920200867_2524934481477300375_o.jp g

Circuit using FET in constant current load, NOTE C4 is now removed.

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xta1/t31.0-8/11782138_1466591673659192_813145443424692738_o.jpg

My first SECA using the PCB, ugly yes it is.

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xpa1/v/t1.0-9/247015_1460637814254578_5897761663152213302_n.jpg? oh=3f3cc6359d88b468210bb5595295435e&oe=56E94A87

The Darlington version used in the constant current load.

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xal1/t31.0-8/10947440_1445807629070930_8512476540938221699_o.jp g

BOM for the Darlington version.

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xfp1/t31.0-8/10986693_1445806865737673_3721784025769130889_o.jp g

[Colin Wonfor]

Here is the article I wrote a long time ago based on the TOCA amps.

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xaf1/v/t1.0-9/11146295_1409120359406324_7483658714791236237_n.jp g?oh=a548934068693fee25ddce946baa97d7&oe=56F9361A

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xaf1/v/t1.0-9/11129359_1409120356072991_7162225865713862034_n.jp g?oh=9c00d59434db4ddaf0b9361438b6c4dd&oe=56EAF37E

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xfa1/v/t1.0-9/11133666_1409120342739659_6842363969077813191_n.jp g?oh=0194d095d5fbf791a8f280bde17f11e2&oe=56DE1DA5

And this is what they looked like.

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xft1/v/t1.0-9/10981614_1406623902989303_1108928776440984274_n.jp g?oh=cc6c6f85f6ea85201363ccfec4acfda3&oe=56E9F727

[Colin Wonfor]

Lots if tips a help here:-

http://theartofsound.net/forum/showthread.php?38912-SECA-KITS-Diy

http://www.audiochews.com/discussion/1608/building-colins-seca-kit#latest

http://theaudiostandard.net/thread/1373/seca-kit-diy

http://www.pinkfishmedia.net/forum/showthread.php?t=179305

[Colin Wonfor]

Well today I am free from TQ after 2yrs of shit, they have paid me a tiny money for my shares (less than half a year salary) but I can now bring out new cables and electronics. Yipeeeee life is mine.OK the legal guy took nearly half of what I got and the other half went to the now beloved Ex. But I can buy cheese again and coffee well for a week or two. he he

[Gazjam]

Good luck Col. :thumbsup:

[Ali Tait]

Good news Colin, must feel good not to have all that around your neck any more.

[walpurgis]

Good for you Colin. Wish you well with your new ventures.

[mikeyb]

Ah, good to hear that news Colin, all the best for the future, all I've learned about HiFi had been over the last couple years or so and I now know you to be one of the good guys, and most probably a genius where amplification concerned......






Does crawling get me any discount 😉 😀

[Firebottle]

Bl**dy excellent news Colin, knock 'em dead with your excellent designs :thumbsup:

[Arkless Electronics]

Nice to hear that Colin :)

[Colin Wonfor]

Thanks guys no for the cheese mmm

[Yomanze]

Colin, does this mean you are going to start building up amps to sell?

[Colin Wonfor]

I am and we have some now, 20W/ch SECA, 50W A Class, 100W A Class, Retro Claymore, 25 Mini Amp, USB Low Noise Low Impedance PSU, SECA Pre, SECA Module Pre, and Nice cables.

And the SECA Kit for the brave and loving GIYers

[Firebottle]

GIY? Graft It Yourself maybe?;)

[Colin Wonfor]

Sorry missed that "Go Into Yonder" or DIY, well back to Hcsool for em

[Colin Wonfor]

The new pcb are now ready to order with the PSU SECA combined, it has got some SMD parts but I am using 1206 so not so hard to build.
This helps us all as the cost is reduced yipeee PM please.

[Colin Wonfor]

Very Odd I replied to this yesterday before the new kitchen and minor flooding came.

Right the PCB that James uses biased up and a increase in voltage will give 50W it is in fact the original PCB which I thought I had lost the artwork for, the problem will be in the 40W version the heat sink will rise between 15 - 20C above ambient and with lovely kids about like James darling, I did not want them to get damaged,
But by increasing the bias and voltage you will get on testing 52W and a heat sink temperature increase above ambient depending on standing and clearance between 18-25C.

So the PCB we have are the same as James but will do the job so go get them lads.

But do have fun and any problem do contact me here.