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DiscoverCircuits.com -- Hobby Corner
Last Updated on:
Tuesday, June 01, 2021 03:06 PM
Hobby Circuits List
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LINK to Dave's circuit, but DO NOT COPY any files to your WEB
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More
LED; White LED;
Driver
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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. |
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Click on Circuit Below to view PDF of Schematic |
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