I attempt to build a blinking circuit using 12V truck light ( like this one: http://www.princessauto.com/pal/en/Tail-Lights/4-in-LED-Stop-Turn-Tail-Light/8126047.p). I have try to build a single LED blinking circuit and doubt that the same circuit would work with this 12V (24-LEDS) indicator light. I'm seeking advices/directions on how to build this circuit. It would be grateful if someone can give me a working circuit for it.
Thank you
Electronic – How to build a blinking 12V indicator LED light
12v555lighttimer
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Best Answer
This is your garden-variety 555 astable set for about 1/2 second on and 1/2 second off, driving a transistor switch which turns the lamp on and off.
LAMP DRIVER DETAILS:
Here are links to the 555 and to the PN2222 data sheets, and the power budget for the PN2222 follows.
I wired up the transistor with a 24 ohm load instead of a lamp, and it's been running at 1 Hz, with a forced beta of 10 for a while now, and its case temp is at about 31C, so data sheet worst case spec's aren't even close.
I'll let it run for a few days just to see what happens, but I don't expect any surprises.
A MORE SENSIBLE APPROACH:
Although about five times more expensive than a PN2222, an IRF7201 takes all of the guesswork about which 2222 is better than which out of the equation, and is a bulletproof substitute in this application: