On my opamp mic with a transformer, my virtual ground is unbalanced, it is closer to actual ground than to V+
I thought it might be DC running through the transformer primary, I've tried with the transformer DC decoupled with a cap (on the virtual ground side), and I think that helped somewhat but I'm still getting an unbalanced virtual ground.
here's the schem:
(possibly irrelevant aside - in my latest version I'm using a 7:1 transformer and appropriate value changes ie R3/R4 are 6.8k, D1 is 27V, R6 is 6.8k and R7 is 1k, but I have had this issue with a 1:1 transformer as well.)
what am I missing here?
From memory the version without the transformer doesn't have this issue, but I don't see how the transformer could be causing it.
thanks in advance!
