The first time I did this I followed this
pic , it didn't work and I thought I killed my memory card

. The Collector and Base were switched. After I figured this out I did
this and it worked. I have since done this for all my friends, they had to have it after they saw it.
276-2009 - NPN Transistor MPS2222A $0.69
271-1335 - 5pk 10kΩ ¼ watt resistors $0.99
271-1315 - 5pk 330Ω ¼ watt resistors $0.99
And A 3 volt LED of Your Choice, I'm not sure of current limitations.
I used: [I filed it down to a rectangular shape to fit
pic ]
276-316 - Blue 2600 MCD intensity, T-1-3/4 (5mm) size LED $4.29
Wavelength: 468mm (typ.), Type: T-1-3/4 (5mm), Lens Color: Clear, Viewing Angle: 30°, If mA: 20 (max.), Vf: 3.7 (volts typ.), Vf: 4.5 (volts max.)