Electronic Circuits and electronic circuits, electronic schematics plus an extensive resource for hobbyists, inventors and engineers

DiscoverCircuits.com, has 40,000+ electronic circuits, cross-referenced
into 500+ categories.    We have searched the web to help you find quick design ideas.
We make every effort to link to original material posted by the designer. 
Please let us if you would like us to link to or post your design.

HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches

>

Circuits designed by David Johnson, P.E.
Last Updated on: Friday, November 17, 2017 06:32 AM

List of Dave's Circuit Designs

The contents & graphics of Discovercircuits.com are copyright protected.
LINKING to Dave's circuits is permitted but DO NOT COPY any files to your WEB SITE server



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 networkís resonant frequency.  A similar coil, located some distance away, collects some of the magnetic field produced by the oscillatorís 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

More  LED CircuitsFlashers

Dave's Circuits


eMail David A. Johnson, P.E. about this circuit

 


HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches


 About Us   |  Advertise on DiscoverCircuits.com   |   Report Broken Links  |    Link to DiscoverCircuits.com  |    Privacy Policy

Copyright  2002 - 2015 David A. Johnson & Associates.  All Rights reserved. 
 Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.