Hey nice to see you again guys! Now I'm back with another instructable. I shall teach you how to make a diy joule thief. This is one of the easiest way to make a joule thief and the most powerful one. For those who don't know what a joule thief is, it's a small circuit that is capable of powering an LED from an old 1.5v cell.
So, let's begin!!!
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Step 1: Materials and Tools
To make this project, you'll need:
A toroid bead
2N3904 transistor or any equivalent one
1k ohm resistor
Wire strippers or scissors
Tape or soldering iron
Step 2: The Basic Joule Thief
This is the circuit which i had built at first, using a toroid bead. Before starting i will inform you that, this is NOT A SUCCESSFUL circuit. You will find this circuit all over the internet.
WINDING THE TOROID
Take two different colored wires and tie one end together as shown. Don't forget to remove some insulation!
Now wind the wire around the toroid as shown in 2nd image.
Step 3: First Assembly
Now connect all parts as shown in the diagram. Note that the transistor's flat side is facing front.
Now connect the cell and try it out. Most probably, the brightness of the led will be low or the led will not glow at all.
DON'T WORRY, now i shall explain you a simple modification.
Step 4: My Next Circuit
Here's what you should do if your circuit is not working [like mine ;) ].
Get an inductor(see first image if you don't know what it is), you can find one in a dead CFL bulb and some magnet wire.
Now, wind the magnet wire several times around the inductor. Connect one loose end of your winded wire with one wire from the inductor.
Step 5: Assembly and Testing
Replace the toroid in the previous circuit with the inductor. Refer the diagram for instructions in connections.
Now again connect the cell. Woah! The LED glows with full brightness.
Step 6: Organizing Everything
Solder or tape everything to a bread board or a cardboard[if you are out of cash :( ].
Test it once again and you have it. An easy way to save energy. Thank you for viewing my project. Please let me know if I've made any mistake while writing this instructable. Now its your turn to make a joule thief, GOOD LUCK!