Efficient Joule Thief Power Supply




Introduction: Efficient Joule Thief Power Supply

About: Hello, my name is Arpan, I'm a college student. I like making things out of waste. When I'm not busy with my studies, I design home decor and spend my time with simple electronic circuits. Now, I'm here to s...

Hey everyone, getting busy with your DIY projects? If your projects are LED based, you will require a power supply that is quite efficient and make sure the circuit consumes low power. A joule thief can be a solution. Only problem, its quite hard to build, especially for beginners. No worries! In this instructable, I shall teach you how to build an easy and powerful joule thief.

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Step 1: Get the Parts

You will need:


2N3904 or a BC547 NPN silicon transistor

Magnet wires

1k ohm resistor


Toroid (optional)

Soldering iron (optional)

Solderless breadboard (optional)

Step 2: A Word Before You Begin

The original design includes a toroid as the power booster. The hardest part is to wind the wire around the toroid. So, i shall show an alternative to the toroid which is easier to use, modify and gives efficient output compared to the toroid model (as noticed by me)

Step 3: The Circuit

Plrase refer the image. Here, the toroid is replaced by a transformer, which is actually a small inductor.

Step 4: Winding the Inductor

Take a magnet wire and simply wind about 10 turns around it. Thats all! Now, connect the parts as described in the circuit.

Step 5: Testing

The device works great with an old 1.5v aa battery. Good luck!

If you feel the project is good, Please give me a vote. Thanks. See you soon with another instructable.

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Power Supply Contest

Explore Science Contest 2017

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Explore Science Contest 2017

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    2 Discussions


    2 years ago

    Could you give a description of the inductor you used? Something to narrow the search. Thank you.

    Future ahead
    Future ahead

    Reply 2 years ago

    You can use almost any small inductor. The inductor you find in a CFL circuit should work fine.