One of of our very first projects was a much more complicated version of this circuit.  Recently we simplified this to a single sided board.  These run about 18 hours and look demonic in trees at Halloween.

Demon Eyes takes a standard 9v Battery, not included.

SMTdemonEyes Kit $5ea/ no battery:

SMTdemonEyes Assembled $7ea/no battery:

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Blinky Through Hole