supercharged lemon

Step 4 Solder & test the joule thief

now we're going to build the joule thief itself

solder the resistor to the middle leg

the short leg of the LED (the minus) goes to the rightmost leg of the transistor, and the long (the plus) leg goes to the LEFTmost leg of the transistor

the transformer gets one of it's single-wire tips soldered to the loose end of the resistor, and the other single-wire tip goes to the long leg of the LED

to test the joule thief - connect the twisted end of the transformer to the plus of an AA battery, and the short leg of the LED - to the minus of the battery

if the LED doesn't light up - check your circuit