Sound activated LED?

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!

dog digger5 years ago
Here it is
LED.bmp
iceng5 years ago
Here is an ible you need to look into and the means to add LEDs
Which will stress your 9 VDC battery.

A
LM3915
frollard5 years ago
'light up depending on volume' is exactly what you're looking for.

words to search:
VU meter
colour organ