Use the schematic below as a guide in soldering togeather the transmitter circuit. Everything to the left of the laser is the transmitter circuit.
Tape or glue the compents down to a piece of cardboard, or use a breadboard.
Check out the photo of my finished board. I used an 1/8th inch female jack to make connections easier.
To test the circuit, turn up the iPod volume to MAX, play some music with alot of bass, and turn the potentiometer all the way down. The laser dot should appear to pulsate with the music, since this is an amplitude modulated (AM) circuit.