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I designed this circuit with the ICM7555 to replace the obsolete LM3909
in a blinking led circuit, or a poor man's alarm system. The circuit was
was designed to operate from a 9 volt battery and to consume as little
as possible. Current consumption is 200 µA and the circuit will continue
to work until the battery voltage drops to approx. 5 volt. No black magic,
I used the charge of the timing capacitor to make the led blink. :idea: