[sdiy] Buffering 0V when using a pot as a voltage divider?

Harry Bissell harrybissell at wowway.com
Wed Jun 29 18:49:18 CEST 2011


that siad it might be a benefit to running the zero volt reference in a seoparate trace so it is not
contaminated with ground voltage bounce (from high currents flowing in a finite resistance.

This is a PCB layout issue, usually...

H^) harry


----- Original Message -----
From: Scott Gravenhorst <music.maker at gte.net>
To: Synth-diy at synth-diy.org
Sent: Wed, 29 Jun 2011 12:40:45 -0400 (EDT)
Subject: Re: [sdiy] Buffering 0V when using a pot as a voltage divider?

Justin Owen <juzowen at googlemail.com> wrote:
>Hello,
>
>Kind of an(other) oddball question out of curiosity...
>
>When using a pot as a voltage divider e.g. from 0-xV it's 
>considered good practice to provide xV from a 'stout' buffered 
>source. 
>
>Is there any advantage (or even any use?) to providing a buffered 
>GND source for the 0V end of the voltage divider? 
>
>Other, simpler alternatives/best practices for the 0V end?
>
>Thanks,
>
>Justin

I wouldn't buffer ground unless it's a virtual ground (which should
already be buffered anyway).  A real ground should already be "stout".

-- ScottG
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-- Scott Gravenhorst
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