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Help Output flaky

Discussion in 'Electronic Design' started by ecliptic, Mar 8, 2007.

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  1. ecliptic

    ecliptic Guest

    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
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