Author Options:

Sound activated LED? Answered

Hi, need help with my electronics project. I would like to light up a set of LED's (about 20) in response to a microphone input using a 9V battery source. I have searched the internet for schematics but no luck. I only found LED's thatlight up at certian frequencies or light up depending on volume. All I need is to light up 20 LED's whenever a sound is detected on the microphone! Please help!

4 Replies

iceng (author)2012-03-13

Here is an ible you need to look into and the means to add LEDs
Which will stress your 9 VDC battery.


Select as Best AnswerUndo Best Answer

frollard (author)2012-03-10

'light up depending on volume' is exactly what you're looking for.

words to search:
VU meter
colour organ

Select as Best AnswerUndo Best Answer