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How is an led in cordless power tools (drills, saws, etc.) timed to cut off in x amount of time? Answered

I know a little about electronics (very little), and would like to learn more. I was wondering about what kind of circuit, or device is used to have the led turn off at a preset amount of time. My cordless drill has an led that turns on when I squeeze the trigger, and then doesn't go off for 20 seconds, every time. I would like to know so that I can learn how to design projects that might need to have something turn off at a preset time. Thanks to all!

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Josehf Murchison
Josehf Murchison

7 years ago

That can be achieved with a capacitor or a timing circuit.

A capacitor can store a charge and slowly drain through a resistor keeping the LED on until the capacitor is drained.

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rickharris
rickharris

7 years ago

You can make a 555 time to do that - Plenty of explanations and circuits on line.