Rod Elliott P3A with SANKEN 2SC2922/2SA1916 - diyAudio
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Old 19th January 2013, 04:40 PM   #1
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Default Rod Elliott P3A with SANKEN 2SC2922/2SA1916

Hello all!

With a few pairs of Sanken, I decided to make a card for the P3A class A.
I do not know if the design of the circuit is optimized properly but I have found no connection error.
For those interested I have attached the files.

Greetings!
Attached Images
File Type: png P3A_Circuit.png (5.3 KB, 911 views)
File Type: png P3A_Implantation.png (28.9 KB, 906 views)
Attached Files
File Type: pdf P3A_CI.pdf (23.1 KB, 187 views)
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Old 21st January 2013, 06:40 PM   #2
amptech is offline amptech  Scotland
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hi, in this design one of the driver transistors is used to monitor the q-temp.. your lay out does not show where you've placed the tracking transistor..
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Old 21st January 2013, 10:52 PM   #3
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You are pushing the stability envelope using very high Ft output parts in a CFP ouput stage.
That's risky but to compound this with long, wandering traces of inappropriate and strangely
varying thickness there is asking for trouble. You can do a lot better there in the physical location
of the drivers and placing the output transistors along the same edge to get the traces to more
reasonable length. Lead stress due to mechanical assembly issues will likely be reduced too.

There are several threads here of guys DIYing their own P3a PCB which is fine as a learning exercise,
so please search those P3a threads for the hard lessons and good advice in PCB layout first.
This topic comes up again and again so it's not just a matter of one opinion.
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Old 27th January 2013, 03:05 PM   #4
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I changed the design in the hope that here will be better. The drivers are now two transistors coupled to the transistor by a thermometer aluminum plate serving as a heat sink.

Thank you for your contributions!
Attached Images
File Type: png P3A_CI_.png (10.1 KB, 708 views)
File Type: png P3A_Implantation_.png (19.6 KB, 696 views)
Attached Files
File Type: pdf P3A_CI.pdf (25.4 KB, 64 views)

Last edited by Project16; 27th January 2013 at 03:10 PM.
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Old 29th January 2013, 12:49 PM   #5
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Hello all!

I tried to improve the design of the card, but I have a small question.

The first image track passes between the legs of the transistor Q8 but I think it is very close.

On the second picture I put a strap.

What is the best design?

Thank you!
Attached Images
File Type: png PCB_1.png (25.4 KB, 624 views)
File Type: png PCB_2.png (25.3 KB, 253 views)
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Old 29th January 2013, 03:16 PM   #6
jaycee is offline jaycee  United Kingdom
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The second one, if you are making the PCB at home and have no soldermask.

Q9 should not be a TO-220 device... an MJE340 (TO-126) will be OK though.

In this design, and especially with those Sankens, i would recommend extra 330uF decoupling capacitors in parallel to C+ and C- for stability.
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Old 29th January 2013, 04:10 PM   #7
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Jaycee thank you for that answer.

Q4, Q5, Q6 and Q9 are TO 126 (BD 140, 139), I was not in my software footprint for those below.
After checking my drawing has a small error that I repaired.

Thank you again!
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Old 17th June 2013, 03:11 PM   #8
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Quote:
Originally Posted by Project16 View Post
Hello all!

I tried to improve the design of the card, but I have a small question.

The first image track passes between the legs of the transistor Q8 but I think it is very close.

On the second picture I put a strap.

What is the best design?

Thank you!
What about this project?
I'm interesting because i have 2sa1295 2sc3264.
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Old 17th June 2013, 03:55 PM   #9
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What the result with that sanken 2922/1216?
I have them also
but I doubt it will suit in this tricky circuit...
on the original site no recommendation to use it, maybe can cause some trouble
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Old 17th June 2013, 04:41 PM   #10
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I did not continue this project in doubt and I preferred to use my Sanken in the DX Super A destroyerX.

Dx Blame ST together Dx Super A

regards!
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