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Old 30th November 2006, 10:06 PM   #101
Sheldon is offline Sheldon  United States
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Quote:
Originally posted by anatech
Hi Sheldon,
I don't think having the PS directly on the board is too helpful. Mike effectively does that with the local filter/bypass caps.
-Chris

I may have misintrepreted, but the Bob Cordell ps thread seems to indicate some benefit for close coupling of the supply caps and output.

Regardless, it's a compact layout and I like that. He also seemed to be getting very nice results. That may have nothing to do with the caps but it would seem to indicate a good overall layout.

Sheldon
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Old 1st December 2006, 01:57 AM   #102
anatech is offline anatech  Canada
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Hi Sheldon,
I think good layout trumps supply location any day of the week.

-Chris
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Old 1st December 2006, 04:32 PM   #103
Sheldon is offline Sheldon  United States
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Quote:
Originally posted by anatech
Hi Sheldon,
I think good layout trumps supply location any day of the week.

-Chris
Seems reasonable. So let's convince AAK to post the layout, and we can have both a good and compact layout.
Sheldon
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Old 3rd December 2006, 09:37 PM   #104
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After having built my first pair of SymAsym I couldn't resist to try a slightly modified pcb layout. This is what it looks like at the moment.

- original Symasym 5.3 circuitry, went for BC550C as input diff pair
- metal foil output emitter resistors
- size: 100 x 50 mm
- single sided
- no wire bridges
- no vertical resistors
- short feedback path
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Old 3rd December 2006, 09:39 PM   #105
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Feedback path colored red.

Comments welcome.
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Old 3rd December 2006, 10:19 PM   #106
AAK is offline AAK  United States
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Hi all,

No, you don't have to convince me. I said I'd give you a PCB and here it is. Where I work we've been in survival mode since mid October and things have been pretty tough lately.

Anyway, the PCB in the pic is a new revised version that includes two components that where left out of the original board layout because of lack of space. Luckily I was able to figure a way to squeeze them in without changing things to much and keep the original dimensions and all traces minus the feedback trace on the bottom of the board.

I'll follow up with gerbers and drill files shortly. The parts numbers labeled on the amplifier part of the board is according to Mike's schematic found here.

http://www.lf-pro.net/mbittner/Sym5_...ymasym5_3.html

I'll also follow up with a schematic of the PS section.
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Old 3rd December 2006, 10:27 PM   #107
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Yeah I didn't made my PCB yet, which one is better?
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Old 3rd December 2006, 10:41 PM   #108
AAK is offline AAK  United States
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I left the component grip point enabled. Here's a pic without it.
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Old 3rd December 2006, 11:35 PM   #109
clem_o is offline clem_o  Philippines
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Quote:
Originally posted by HBarske
Feedback path colored red.

Comments welcome.

Turn the input pair 90 degrees clockwise - this would allow more phsical clearance between input and feedback traces as well as avoid having the feedback trace so near the pinouts of the 1st transistor. Of course it would mean moving maybe some parts a bit to accomodate...

Cheers!
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Old 4th December 2006, 12:09 AM   #110
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Quote:
Turn the input pair 90 degrees clockwise
I gave it a try:
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