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Old 28th January 2001, 07:09 PM   #1
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Location: Austin, Texas, USA

I'm on my third attempt at the Return of Zen amplifier, I think I found a flaw in my original circuit board.

However, the picture doesn't make it clear. If you look at the schematic, it says one of two things:

Connect R11 from -out to ground.
Connect R11 from -out to the input capacitors.

The latter makes more sense, and is the way I did it last time. However, since I failed on my first attempt, I'm doubting everything this time.

I sent an e-mail to Nelson Pass. So, if he responds, I'll have a difinitive answer. So, first, what do you people think the answer will be? I would really like to etch the board today.

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Old 29th January 2001, 12:52 AM   #2
FYC is offline FYC  Hong Kong
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I assume you refer to the "Zen revisited". That R11 is the feedback resistor and is connecting from the output back to the input of the MOSFET, not to ground.
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Old 29th January 2001, 02:52 PM   #3
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Thumbs down Feedback!

Forget the feedback. You don't need it! Sounds fine without it. Just my opinion.
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Old 29th January 2001, 04:03 PM   #4
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Ok, thanks.

I etched a new board with a place for a jumper. So, I'm set. I didn't connect the jumper.

All I have to do now is put the thing together and I'm ready to test it again.

I built a function generator. And I have an oscilloscope. So, I'm going to be able to test it properly this time.

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