Maker Pro
Maker Pro

Help Output flaky



Jan 1, 1970
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