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Alarm LED Flash Simulator

Led flash alarm simulator

False Alarm Led Flash Simulator

LED flashes twice a second

Capacitor and resistor values variation will change the frequency.

Supply voltage influence frequency of operation.

A BC337 can replace 2N2222A; voltage can be 9V.

Second circuit work directly off the mains 110V or 220V,

110V AC Resistor = 47K.

Using in second circuit BC337, resistor is 390K for a 220V and 180K for a 110V.