You might be on to something here. We do use a 24VAC transformer as this is an HVAC controller. I'm starting to wonder it we are generating a large spike on the ground side which will change the ground potential to the op-amp. The only problem with this theory though is that why wouldn't other components be affected as well? As Op-Amps more sensitive to transients like these. Next question would be how to protect the little sucker from this type of condition? Also why the LM324? What about the 741 or another single chip variation. I'm very limited for space.
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