[sdiy] generate 0v from out of nothing..

[Grant Richter]

Why not simply use a voltage divider at the reference terminal of each
op-amp? There should be no need to buffer it for op-amp reference use. The
only current flowing for the reference terminal (+ pin) in an inverter
circuit is the bias current of the input stage . This is typically less than
1 microampere, and will simply shift the DC value by E=IR.

> From: pfperry at melbpc.org.au
> Reply-To: owner-synth-diy at node12b53.a2000.nl
> Date: Sun, 27 May 2001 02:07:24 +1000 (EST)
> To: synth-diy at node12b53.a2000.nl
> Subject: Re: [sdiy] generate 0v from out of nothing..
> 
> "Nils Pipenbrinck" <np at inverse-entertainment.de> wrote:
>> Isn't there a old analog-guru trick to generate 0V from out of nothing? This
>> would help me a lot because my biggest problem with the pcb is the
>> ground-signal (which is used almost everywhere)-
>> I think about using a free opamp in my TL074.
> 
> This is cool, just wire an op amp as a follower. It is only useful if you
> don't already have an earth, though. There are even chips made specially for
> this aplication (the 'rail splitter' from TI).
> 
> paul perry melbourne australia
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