Built this low freq. amplifier to feed an AD. That feeds a graphic output. The output can currently be centered between about +2.5v to
-2.5v. Seems to try to center on the + side for 1-10 sec then spikes down to the -2.5v side. I suspect either an asymmetric response from the 220uF cap or the floating pins may be my problem. The power supply is using an ICL7660 charge converter to get negative voltage. The voltage supplied is about +4.98 and -4.88 v. This is also a suspicious item as it may be influencing the spiking, but I do not see any fluctuation in power. Does anyone see the real problem for why it won't center on zero and the spiking??