Zen Schematic Ambiguity

pixie · 28th January 2001, 07:09 PM

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.

Thanks,
pixie

FYC · 29th January 2001, 12:52 AM

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.

vdi_nenna · 29th January 2001, 02:52 PM

Forget the feedback. You don't need it! Sounds fine without it. Just my opinion.

pixie · 29th January 2001, 04:03 PM

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.

Later,
pixie

29th January 2001, 02:52 PM	#3
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA Blog Entries: 1	Feedback! Forget the feedback. You don't need it! Sounds fine without it. Just my opinion.

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28th January 2001, 07:09 PM	#1
pixie diyAudio Member Join Date: Oct 2000 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. Thanks, pixie

29th January 2001, 12:52 AM	#2
FYC diyAudio Member Join Date: Jan 2001 Location: Hong Kong	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.

29th January 2001, 04:03 PM	#4
pixie diyAudio Member Join Date: Oct 2000 Location: Austin, Texas, USA	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. Later, pixie