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LED Circuits, Flashers Wireless LED
Flasher -- January 9, 2011 There are times when you
would like to flash a LED through a thick plastic case without wires. The
circuit below performs this feat. It can be powered from a supply ranging from
3v to 6v. It draws about 300ua of average current at 5v. It uses a low power op Amp as
a pulse generator. A negative going pulse from that generator gates a power
oscillator on for about 20ma. That oscillator is connected to a series resonant
circuit, which drives a small coil.
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