[sdiy] Buffering 0V when using a pot as a voltage divider?
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...
----- Original Message -----
From: Scott Gravenhorst <music.maker at gte.net>
To: synth-diy at dropmix.xs4all.nl
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:
>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
>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?
I wouldn't buffer ground unless it's a virtual ground (which should
already be buffered anyway). A real ground should already be "stout".
-- Scott Gravenhorst
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