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MR Guy asked How would i make a sound sensitive led?
Hi, I was wondering if there is a way i can take an old pc mic(those cheap ones) and take the mic out of it. and some how wire it to a 9v power supply and some leds and make them light up or pulse with music, or just when noise is audible. I have little knowledge of circuits, so could any one help or send me in the right direction, ive googled it but nothing useful has came up.
And got the following answer:
There is a way. You need a preamp firs, to amplify the microphone signal to one you can do work with. The, you can use that to drive LED drivers, probably through comparators. You use variable resistor to set the level. To light on certain frequencies, you need a filter for those frequencies.