In is signal from a audio device that usually outputs to a headphones,One first needs to know the range of the input signal at 'IN'. You'll possibly note the 10k pot wiper range (to comparator (?) pin 6) is from +6V to -6V indicating the input 'IN' may lie somewhere in this range.
After reducing the voltage I would like to replace the relay with an electronic component.There is no "flywheel" diode shown for the relay coil. Although C2 will slow the turn-off time of the transistor, a flywheel diode should still be used; if C2 fails, the transistor turn-off will be rapid, and the resulting spike will destroy the transistor.
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by Jake Hertz
by Aaron Carman
by Aaron Carman