Plugging an audio cable between two devices that are powered by AC can
put a lot of stress on opamps, whose inputs can sometimes be almost
directly connected to the input jack.

Is there a device that is preferred for clamping audio inputs, like a
bidirectional surge absorber is used for power input, but suitable for
this application?

A reasonable amount of capacitance can be tolerated, say up to 100 pF.

Thanks,

Bob

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