A lightbulb in series with a 100nF -> 1uF capacitor on the output works. The cap blocks any DC content in the output but AC oscillations pass straight through lighting the bulb for all to see.
Obviously, you need to size the bulb to your power rails.... A 12v car bulb with a series resistor would work.
Nice one,
David.
Obviously, you need to size the bulb to your power rails.... A 12v car bulb with a series resistor would work.
Nice one,
David.
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