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How can I light my Computer Power On Button
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coinguy:
In the example circuit changing the values of R2 and R1 will change
the on/off ratio and collectively the rate.  You can play with
these values to get even on/off or quick on/ long off or what ever
you like.

A larger calue of C1 will slow the flashes and a smaller will quicken.

BTW: at 5V you will need a resistor in series with the LED start
with 1K or the LED will draw too much current and burn out.
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