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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
Flashers and Blinkers
LED (Light Emitting Diodes) Circuits |
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Super Bright 3v Powered LED
Flasher (April 22, 2009)
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| I have posted several
kinds of LED flashers over the years. This is yet one more flasher, designed
to flash any high power LED of any color. It hits the LED with a 25ms 250ma
pulse once every 2 seconds. This works out to an average current about 3ma.
It is powered by any 3v source. I suggest two AA cells but a single 3v lithium
coin type cell will also work. With fresh AA cells, the light should flash for
about two weeks. The light flash is very intense and is perfect for any
attention getting night time application. |
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| The
circuit uses a TLV3701, which is a nifty single low voltage, low current voltage
comparator from Texas Instruments. I configured the oscillator circuit to produce
the needed pulse signal. A charge pump circuit and an active current limiting
circuit supplies the LED with the needed drive signal, whose voltage can exceed the 3v
from the battery. This method insures that the typical 3.6v required by most white
LEDs can be produced. |
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Click on Circuit Below to view PDF of Schematic |
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