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  LEDWhite LEDDriver

White LED is Powered by One NiMH Cell

There are a lot of white LED driver circuits floating around.   A popular circuit called the “Joule Thief” can drive one white LED from a single 1.2v or 1.5v battery cell.  Most of these circuits use one or two transistors to form a voltage boost circuit.  Yes, they those circuit do drive a LED but they are not very efficient and they don’t do a good job of controlling the current to the LED.  The circuit below uses a tiny LT1932 IC made by Linear Technology.  This IC can be configured for a wide variety of LED driver needs.  I have shown one simple application.  The circuit takes power from one 1.2v NiMH rechargeable battery or a 1.5v disposable battery and drives a single white LED with 15ma of current.  With an efficiency of about 70%, the circuit should run for about 40 hours, if a quality 2500ma-hour battery is used.

Click on Circuit Below to view PDF of Schematic

1 battery Cell LED Driver Circuit schematic (Sept 26, 2009)

More  LED;  White LEDDriver

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.