Sound-Activated LEDs

This project is
Extremely easy and quick.
I think you won't need much electronic background
To produce one identical to mine.

I spent around 5 hours on this project:
1 hour designing
1 hour testing
3 hours finalizing

Sound-Activated LEDs
Parts you need:


Any Number of LEDs (Cheap from Ebay - LINK)
1 x Prototype Board
2 x TIP31 BJTs (or any BJTs with enough power)
1 x 3.5mm Stereo Audio Jack
2 x 100 Ohms Resistor
9V Battery and Strap


Motherboard (PC) Standoff Screws

I am guessing most of you have some experience in electronics
so I will just upload my schematic I did on paper.

If you have any question,
please email me joekwuen@gmail.com

My prototype board looks like this:


By Joe Kwuen