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Old 7th December 2008, 09:35 AM   #21
Khron is offline Khron  Romania
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I fiddled around a bit more with the board, and managed to squeeze in a pair of more usual fuse holders. That oughtta put Chris (Anatech) at ease
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Old 7th December 2008, 11:49 AM   #22
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Quote:
Originally posted by Khron


That's the 10 ohm // output inductor.

Ah, I didn't see a Zobel so I didn't consider the output inductor. Will there be a Zobel? As I recall there has been some discussion in a thread or two about locating the Zobel as close to the outputs as possible. The output inductor//resistor could be located off the main board to save space (bigger coil).

Also, many of the amps you see can be built with different devices. I remember you asked me before on my patchwork thread if it could be built with more common transistors. It's nice to have the best choice for every part but it's not critical. I'm sure the symasym wouldn't suffer a performance hit if you changed the outputs or used a different differential pair. Don't be afraid to experiment.
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Old 7th December 2008, 11:54 AM   #23
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The Zobel is on the right side of the "bias generator" group, in the middle of the board.

Mike Bittner mentions on the Symasym page some of the modifications possible and/or necessary (2sa/2sc devices, and different diff pair etc).

I'd rather do one thing right (or at least "right") from the first try, than fiddle around endlessly with possibilities That's how my whole audio project got dragged through time, now reaching about 3 years without having almost anything done 100%
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Old 7th December 2008, 12:07 PM   #24
roender is offline roender  Romania
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Try to think to return current path for various elements of this amp and also don't mix high currents, very polluted with harmonics, with low currents from input and VAS stages.

Cheers,
Mihai
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Old 7th December 2008, 12:41 PM   #25
Khron is offline Khron  Romania
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All done. Mersi fain, Mihai
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Old 7th December 2008, 05:46 PM   #26
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Quote:
Originally posted by Khron
The Zobel is on the right side of the "bias generator" group, in the middle of the board.

What can I say - I'm blind
Or is it that colour scheme in Eagle...


Anyway, now that I've actually opened my eyes and looked at it, it looks good. The parts are all well organized, especially in the front end.
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Old 7th December 2008, 05:50 PM   #27
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Well i worked my way from the outputs back to the front end, so i wouldn't cram everything on a minimum of board surface. And, by people's reactions, i seem to be getting good at PCB drawing Well, at least at this quite minor stuff
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Old 7th December 2008, 05:56 PM   #28
roender is offline roender  Romania
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Khron,

There is enough free space on the board. Why don't you put as close as possible the two big elcos decoupling capacitors?

Cheers,
Mihai
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Old 7th December 2008, 06:00 PM   #29
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I assume you mean "bring them closer to the middle of the board". Yeah, i guess i can give it a shot. Be back in a few mins
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Old 7th December 2008, 06:10 PM   #30
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Hmm... I'm not sure if this is what you meant, but i pushed the big elcos closer to the outputs. Besides, isn't that better, than having them closer together?
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