Zen ZV9 Question

Albertone · 13th November 2006, 05:09 PM

Hi!
I am building a Zen ZV9, so I am searching for a couple of 25k potentiometers. Nelson says in his pdf that all resistors are 1/4 W, so should I use a 1/4 watt potentiometer or can I use a pot with more power??

Nelson Pass · 13th November 2006, 06:05 PM

You can use any pot you like - it isn't going to conduct
signal, and of course you can substitute resistor values
until you get what you want, which is an output DC
voltage at 1/2 the regulated rail.

Albertone · 14th November 2006, 12:41 PM

What an honor!! The Mighty Nelson Pass in person!!!

Forgive me for the idiot question, but I'm a newbie....
Thank you very much.. and thank you for this great amplifier!!!

Albertone · 14th November 2006, 12:50 PM

Sorry Nelson, but can I use this pot with the default resistor values?? (I absolutely don't want to make any error in the building!!)

Potentiometer

Alain Dupont · 14th November 2006, 04:17 PM

Albertone,

http://www.digikey.com

Ref# 490-2979-ND

Murata TRIMPOT CERM 25K OHM 12TRN TOP 250mW

http://rocky.digikey.com/WebLib/Mura...7%20series.pdf

As a good example...

Alain.

Albertone · 14th November 2006, 04:31 PM

So the one I selected won't work?? Because I'd like to mount a stereo one...

Alain Dupont · 14th November 2006, 04:40 PM

Albertone,

I can't reach the one you did choose, the link is not working

could you please give the reference ?

Alain.

Albertone · 15th November 2006, 11:57 AM

Of course! Here's the Digikey part number:

KKA2531S28-ND

Alain Dupont · 15th November 2006, 12:19 PM

Albertone,

Are we speaking of P1 the pot in the lower left of the schematic ex Fig #6

The point is each channel has to be adjusted separately
and the current in this pot is < 0.75 mA

so why not ; but quite overkill....
{plus to find the sweet pot of the second channel you'll have to add a separate
pot on one channel, not really easy}

And a 12, 15 or 20 turns will be much more easy to adjust !!!

Alain.

Albertone · 15th November 2006, 01:37 PM

Yes the P1... Isn't it the pot for adjusting the audio volume?
So... if i mount one per channel, I have to adjust the volume for each channel separately, right?? This doesn't look very nice....

13th November 2006, 05:09 PM	#1
Albertone diyAudio Member Join Date: Sep 2006	Zen ZV9 Question Hi! I am building a Zen ZV9, so I am searching for a couple of 25k potentiometers. Nelson says in his pdf that all resistors are 1/4 W, so should I use a 1/4 watt potentiometer or can I use a pot with more power??

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13th November 2006, 06:05 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	You can use any pot you like - it isn't going to conduct signal, and of course you can substitute resistor values until you get what you want, which is an output DC voltage at 1/2 the regulated rail.

14th November 2006, 12:41 PM	#3
Albertone diyAudio Member Join Date: Sep 2006	What an honor!! The Mighty Nelson Pass in person!!! Forgive me for the idiot question, but I'm a newbie.... Thank you very much.. and thank you for this great amplifier!!!

14th November 2006, 12:50 PM	#4
Albertone diyAudio Member Join Date: Sep 2006	Sorry Nelson, but can I use this pot with the default resistor values?? (I absolutely don't want to make any error in the building!!) Potentiometer

14th November 2006, 04:17 PM	#5
Alain Dupont diyAudio Member Join Date: Sep 2003 Location: Paris - France	Albertone, http://www.digikey.com Ref# 490-2979-ND Murata TRIMPOT CERM 25K OHM 12TRN TOP 250mW http://rocky.digikey.com/WebLib/Mura...7%20series.pdf As a good example... Alain.

14th November 2006, 04:31 PM	#6
Albertone diyAudio Member Join Date: Sep 2006	So the one I selected won't work?? Because I'd like to mount a stereo one...

14th November 2006, 04:40 PM	#7
Alain Dupont diyAudio Member Join Date: Sep 2003 Location: Paris - France	Albertone, I can't reach the one you did choose, the link is not working could you please give the reference ? Alain.

15th November 2006, 11:57 AM	#8
Albertone diyAudio Member Join Date: Sep 2006	Of course! Here's the Digikey part number: KKA2531S28-ND

15th November 2006, 12:19 PM	#9
Alain Dupont diyAudio Member Join Date: Sep 2003 Location: Paris - France	Albertone, Are we speaking of P1 the pot in the lower left of the schematic ex Fig #6 The point is each channel has to be adjusted separately and the current in this pot is < 0.75 mA so why not ; but quite overkill.... {plus to find the sweet pot of the second channel you'll have to add a separate pot on one channel, not really easy} And a 12, 15 or 20 turns will be much more easy to adjust !!! Alain.

15th November 2006, 01:37 PM	#10
Albertone diyAudio Member Join Date: Sep 2006	Yes the P1... Isn't it the pot for adjusting the audio volume? So... if i mount one per channel, I have to adjust the volume for each channel separately, right?? This doesn't look very nice....

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