Step 1: Parts and Tools
2N 3904 NPN transistors X4
2N 3906 PNP transistor X1
connecting wire (if you make it on a solderless breadboard)
a 5V-9V power supply that connects to a wall adapter!!! this is very important!!!
a breadboard (soldered or otherwise)
a coil of magnet wire (dimensions don't really matter. the size only affects amount of interference they receive)