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A curcuit idea I had last night, what do you think?
The idea is to protect a load, like a speaker, from the DC offset of a failing amplifier. The power amp has been left out here for space reasons obviously, but the voltage source is there to simulate it's offset. Turn on the SPST to simulate offset leakage. Now the second op amp, which is wired as an active LPF of 2.4 Hz f3, rises over 100mV which turns on the comparator (third op amp), which in turn triggers a relay. In reality you'd need a transistor to drive it of course.
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