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Old 21st July 2006, 09:18 PM   #11
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the amp schematic can be fount in the site
in the amplifier section under legacy project and it's name is citation 12, Nelson wrote a complete and very informative article describing the schematic...
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Old 22nd July 2006, 12:01 AM   #12
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Second channel is ready! with a smaller heatsink, but it's all I at the moment! ready for a stereo listening!
here is the pict of channel B
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Old 23rd July 2006, 01:07 PM   #13
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Well Now the 2 channels are working to give stereo listening, and I don't use no more my lab PSU regulated, but a non regulated one (21V transformer /35A bridge/ 2x47000mf caps
and here are the first impressions:
no hum or noise
and very clear and wide open stereo effect
very nervous and distortion free sound, in fact a really aenjoyable and involving stereo effect with no agressivity even played loud...
compared to the other amp I have here (onkyo 110W) the medium and highs are much smoother and in the same time seems more natural (not compressed)

But I have to admit that concerning the bass , they are not as good as the onkyo, less bass of course, but what lacks is definition I mean you don't feel the drums are between the speakers , sounds like it they were far away behind,

does anybody have an idea about what changes could be done to the schematic in order to modify the sound in the low end?
adding neg feedback? or upgrading the feedback current
change the gates resistors of 680 ohm for 220 ohm ones
or simply get more bias?(I setteled mine to 120ma)
any input would be apopreciated!
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Old 23rd July 2006, 02:57 PM   #14
Bone is offline Bone  United Kingdom
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Join Date: Jun 2004
Location: Dorset, UK
Default PCB Layout

I am intending to build the complementary MOSFET version using IRF 530/9532.

Before I do one, does anyone else have a PCB layout for this version please?

Also if I use +/- 40 volt rails what sort of power can I expect?


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Old 23rd July 2006, 03:28 PM   #15
Did it Himself
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Location: Gloucestershire, England, UK
There was a full set of good boards posted a couple of years or so ago by Ingvar Ahlberg (think his username was just that or maybe with an underscore.
__________________ my website for UK diy audio people - designs, PCBs, modules and more.
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Old 23rd July 2006, 03:35 PM   #16
mik is offline mik
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Board layouts...

citation 12
Citation12 repair!!
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Old 28th July 2006, 02:26 PM   #17
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The 2 channels run now with 1A bias on each rail , nice sound eccept that I'd like to see what could be done to the schematic to get it tighter in bass...I have a third prototype that Iwill play with iconsidering that matter!

here are the twin amp blocks finished:
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Old 28th July 2006, 08:28 PM   #18
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Location: Kungsbacka on the Swedish westcoast
Boards still available, both original and complementary version.
Layouts available too but but as they are double-sided designs
not that fun for home-etching. Actually i dont think single sided , non plated through pcbs are suitable for audio (although 96% or thereabout of comercial audioproducts are built on singlesided boards). Still its a very nice amp and well worth building. I run them at 1 amp/output device with 45-50V rails. Big heatsinks!
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Old 28th July 2006, 08:56 PM   #19
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yes a top first amp to build , just tried it on JBL studio speakers 15 inch woofers, with only 29v rail and 1amp bias it's juts outstanding ,(actually much better on big speakers than on my tyny 4ohm lab bw)
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Old 28th July 2006, 09:23 PM   #20
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Location: Michigan
Hey, I have always wanted either a Citation 19, or a Citation 12, do you think this project would be good for a first time solid state project? I'm so used to tubes!
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