Stumbled across this schematic and it's like CJ's Shoot the Moon and the EA Tremolo had a baby (Though I think this predates the Shoot the Moon...)–the audio path is like the Shoot the Moon and the LFO from the EA Tremolo has been adapted to pulse an LED. Use a 5mm diffused yellow LED and a 2k light/2M dark LDR (or socket and experiment). The trimmer is a gain/volume control. Set to unity and forget about it.
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