You’re going to need a white or blue LED that is rated for 3 volts, a 1K resistor, a 2N 3904 NPN transistor, a toroid, two pieces of wire and a battery.
You might even be able to scavenge this stuff out of your junk pile of electronics… you have a junk pile of electronics right? PDF Link
You can get the video and this pdf in itunes automatically! – iTunes Subscribe Link
Update: Windell posted more info and a detailed walk through of the toroid winding process. – Link
ADVERTISEMENT
