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AD421 instability

Question asked by JayZee on Sep 8, 2011
Latest reply on Oct 21, 2011 by JayZee

I have a design that uses the AD421 in an optocoupled loop powered configuration.  When I breath on the AD421 circuitry the output rises substantially on a few of the boards. Has anyone else seen this effect?  What is going on?  How do I correct it?  The units are sometimes exposed to humidity and this is affecting they're operation.