Novice looking for advice on sound activated LED

[Aethelstan]

I am very new to working with electronics and am looking for advice on a hopefully small project. The goal is to make a standard LED tea light sound activated. It runs on a CR2032 3 v battery. Ive seen items like this for sale but id prefer rather then spend money it would be more enjoyable to attempt to do it myself.

 

[audioguru]

Try this circuit. It might need a 100uF capacitor from +3V to ground.

 

[Reloadron]

You could maybe start with something like this to act as the sound pickup or use a simple electoret microphone and build a single transistor amplifier. There are plenty of little microphone modules available. Some may be able to directly drive a small LED or another single transistor could be added to drive the LED. Keep in mind a very tiny low current LED as the CR2032 battery won't offer much current to drive the circuits and the LED. In a simple form the sounds would activate the LED and the sound intensity (loudness) would drive the LED intensity (brightness). Circuits like this are based on Color Organ designs so if you Google "Color Organ" you can get an idea of what more complex versions look like.

<Edit> Audio Guru has it covered. His circuit should work fine. </EDIT>

Ron