Audio Relay Driver Circuit

This circuit can be used for flashing lights to sound coming from a computer,iPod,mp3, CD Player, etc… The circuit works as a Single Transistor Amplifier. It works best with songs with a lot of bass. Works well even with House Current! The transistor can almost be any NPN transistor, as long as the relay doesn’t draw too much current or wattage(whichever comes first). I decided to use this circuit to flash Christmas Lights.