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Joule thief is not working? Answered

Learned about the Joule Thief from Make's Magazine and used their schematic.

I'm pretty new to electronics so I don't know much about components.

Applying 3 V, the LED lights up, but applying 1.5 V, no light.
Green wire is 22 ga, blue wire is 26 ga.
Using a 2N3904 Transistor and a Ferrite Toroid.

I think I "barely" got the LED to dimly light up, but it would not stay on.

Am I doing something wrong?

Picture available in second comment.

Discussions

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iceng

5 years ago

Your pic looks correct, but six turns are too few turns of wire for your Ferrite Toroid.

You need 15 turns or a magnetic material like a 3/4" iron washer to carry the flux.

A

JT101.PNG
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rickharris

5 years ago

You satnd much more chance of a reasonable answer if you post a good picture of what you have done .

As the JT circuit works it is fair to assume you have assembled it incorrectly.

As it is such a simple circuit it may be easier to start again and re do it with extra care.

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gera229rickharris

Answer 5 years ago

Instructables wasn't allowing me to post pictures at that time. Thanks.

Joule Thief.JPG