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

DiscoverCircuits.com, has 45,000+ electronic circuits, cross-referenced into 500+ categories.
We have searched the web to help you find quick solutions & design ideas.

Got Designs?
Please eMail if you want me to link to and/or post your original design. 
NOTE:  We make every effort to link to original material posted by the designer. 
Please contact us if our link is not to your site!  Thanks.

DiscoverCircuits.com -- Hobby Corner
Last Updated on: Tuesday, June 01, 2021 03:06 PM

Hobby Circuits List

The contents & graphics of Discovercircuits.com are copyright protected.
LINK to Dave's circuit, but DO NOT COPY any files to your WEB SITE server

More  Control Circuits   LEDs    Indicator   Remote Control

Remote LED Indicator Light -- December 27, 2008

There are times when you would like to transmit a signal from one LED indicator light to second LED at another location.  The circuit below works well for this application.  It takes advantage of the fact that the internal infrared LED inside an opto-isolator has a lower voltage drop than the visible LED being tapped into.  Using a Darlington type opto-isolator also means very little current needs to be diverted to the isolator.  The photo-darlington side of the isolator can be used to turn on the remote LED using any convenient DC source.  In automotive applications, this is often 12v. You can also use the output of the opto-isolator to drive a low power beeper.  This might be handy for something like a “check engine” or a “windshield washer fluid” light.

Click on Circuit Below to view PDF of Schematic

Remote LED Indicator Light Schematic by David Johnson

More  Control Circuits   LEDs 
 Indicator   Remote Control

Hobby Circuits List
eMail David A. Johnson, P.E. about this circuit
HOME Schematics Index Hobby Corner Dave's Circuits Contact Info
Imagineering Ezine Dave Johnson & Associates Faraday Touch Switches

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

Copyright  January, 1998 - June, 2021     David A. Johnson  All Rights reserved. 
 Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.