A shockingly basic question

Tim Cockram tim at redragon.demon.co.uk
Fri Jun 27 20:28:55 CEST 1997


The resistor to ground from the non-inverting input of the op-amp is there to supply the bias current 
to the op-amp.  OK so most basic analyses ignore the bias current but it is real (if potentialy quite small) and 

Re the ground loops the only shure way is to use a transformer which has no reference to ground at all.  However 
the basic differential amp can provide an improvement in the right circumstances.

There was a very good article on grounding etc in the AES journal in the recent past.  I will try to dig it put and post the 

Regards etc.


Tim Cockram
E-mail: tim at redragon.demon.co.uk 

Fax:-    UK-1222-390326


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