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

Neil Johnson neil.johnson97 at ntlworld.com
Thu Jun 30 00:22:09 CEST 2011


Hi David,

> If ground isn't stiff, then it isn't ground!  Every circuit design relies on
> the fact that ground is ground, no matter what.  The only issue might be
> dumping too much current down too narrow of a trace and generating a small
> voltage at the front end, but this is a layout issue, not a ground issue.

Ah, that Canadian humour again!

Reality, meanwhile, has it that "ground" can mean different things to 
different people, and to different circuits.  For example:

- analogue ground
- digital ground
- chassis
- earth
- power ground
- quiet/signal ground

Some more info here:

http://www.ese.upenn.edu/detkin/instruments/misctutorials/Ground/grd.html

Oh, and layout issues are but one aspect.  Grounding is a complex 
subject in its own right.

Cheers,
Neil
-- 
Synth DIY 2011 -- www.diy.synth.net/uk
Homepage -- www.njohnson.co.uk


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