> "If there are OpAmps in a design, terminate unused opamps
> in dual
> or quad packs by grounding the positive input to ground,
> then connecting
> the negative input to the output."

>>The writer of that advice MAY have been living in a dual
>>rail only world where ground is always well away from the
>>rails.

> However to be fair, on a single rail system there is 
> generally a bias point
> that gets regarded as "analogue ground", and that is 
> effectively what is
> suggested for the connection, without it being implicitly 
> said.

I disagree.
Or, if that was the case, they should undergo a brief course 
of self criticism :-).

ie they clearly knew what they were trying to achieve, but 
they wrote a specific instruction which would certainly be 
taken literally by many people. If it is not what they meant 
they should have said differently - as eg you and I and 
others have suggested.

Excess simplicity can be fatal.


        Russell

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