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Last Updated on: Wednesday, October 18, 2017 05:04 AM

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More  LED CircuitsFlashers

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.

Feedback from the coil insures that the oscillator runs at the LC network’s resonant frequency.  A similar coil, located some distance away, collects some of the magnetic field produced by the oscillator’s coil and uses it to drive a LED.  A separation of about 1/2 inch is about the limit for this circuit.

Click on Drawing Below to view PDF version of Schematic

wireless LED Flasher, circuit designed by David A. Johnson

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