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Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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Re: Never apply a signal to an unpowered opamp. nt

Posted by hh on August 2, 2004 at 12:46:18:
I don't see any problem with shorting an input to an unpowered opamp as you would be effectively applying a zero voltage signal, which is the safest possible. But putting a live signal into an unpowered opamp in an amplification chain (even though you aren't using its outputs, since you're using the signal somewhere further upstream) would cause currents to flow in reverse directions as to what they were designed for and that is likely to be bad and may destroy or damage the opamps. Unpowering unused opamps in an audio component can help reduce noise, but it would be safest to disconnect their inputs.