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DiscoverCircuits.com -- Hobby Corner
Last Updated on:
Wednesday, June 02, 2021 03:48 AM
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 |
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More Led
Circuits; Flasher Circuits |
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Universal 3v
LED Flasher #1 |
This hobby circuit below will flash any LED color with fixed
current pulses powered by a 3v battery. It uses a charge
pump approach, which routes a constant current pulse through the
LED, regardless of the LED voltage requirement. Using this
approach, white and blue LEDs, which normally require about 3.6v
can be flashed with a 3v battery. With the component
values selected, the LED is hit with 15ma current pulses lasting
about 10ms every two seconds. This keeps the average
current draw from a 3v battery to about 200uA.
This hobby circuit relies on a
cheap 74HC14 hex Schmitt trigger inverter IC. One inverter forms a pulse
generating oscillator. Other inverters are ganged together to increase the
drive current. A two transistor circuit forms a constant sinking current
controller. |
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Click on Circuit Below to view PDF of Schematic |
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