[sdiy] the obscure output of a 2164

mskala at ansuz.sooke.bc.ca mskala at ansuz.sooke.bc.ca
Thu Mar 9 16:13:28 CET 2017

On Thu, 9 Mar 2017, Neil Johnson wrote:
> You can parallel up the outputs as they just pump whatever current
> they want into the virtual earth node.
> You CANNOT directly parallel the inputs though - the internal feedback
> paths within the 2164 end up fighting each other and then bad stuff
> happens (latchup, oscillations, etc).  You need some isolation between
> the inputs if you want to run multiple 2164 gain cells in parallel.

This seems no different from op amps - you're in a world of hurt if you
connect the inverting inputs of two *directly* to each other.

If you're using resistors to convert voltage inputs into currents for the
2164, does that provide enough isolation that you can connect the
voltage sides of two such resistors together freely?

Matthew Skala
mskala at ansuz.sooke.bc.ca                 People before principles.

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