in this tutorial, lets build a joule thief circuit

Step 1: Circuit Daigram

Step 2: Components Needed

NPN transistor

1k resistor

led

1.5volt battery

enamelled copper wire

ferrite core

Step 3: How to Make the Coil

we need a ferrite core I salvaged this core from an old CFL.make 30 turns with enamelled copper wire on the ferrite core

please watch the video for a better experience

Step 4: How This Works

at first very little current flows through the base and collector of the circuit that will create induction in the primary coil and thus increase in base current and this will increase collector current and this cycle repeated until the saturation. at saturation, the transistor will turn off and the stored energy in the secondary coil flows through the led and which is greater than the input voltage because of the secondary coil in series with input source so. there is a boost in voltage