Solid States Devices > Joule Thief

Joule Thief

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nievesoliveras:
@all

How many turns of bifilar you used for the coil?

Jesus

pese:
HERE SOM HELP for Beginners.

 simply electronic schematics


http://ca.youtube.com/watch?v=z7ABqJ1CKww&feature=related   Resistor LED
http://ca.youtube.com/watch?v=SvqvRNt4fBU&feature=related   Capacitors
http://ca.youtube.com/watch?v=WAZMjLMSd2o&feature=related   Transitors
NEWS:


i have Links up to  Univrity study - i any need this . please place an messy

PESE

Yucca:

--- Quote from: nievesoliveras on November 20, 2008, 05:24:31 PM ---@all

How many turns of bifilar you used for the coil?

Jesus

--- End quote ---

Hi Jesus,

I'm using 22 turns of 30 awg wire.

Yucca.

nievesoliveras:
Thank you pese!
Thank you yucca!

Yucca:
@Groudloop, I will also try your mod of the thief to compare it to what I've built.

@Bill & All,

OK, I've completed my first joule thief as per the circuit I referenced above except I've used a 2N3904 instead of the BC part. My apologies to all for the poor picture quality, I had to use a webcam and it doesn't have focus on it  :'(.

I tried to wire it up without labelling the coil wires to begin with and did not wire it up right so it took longer than it should have. Maybe I shouldn't have had that pre teatime beer!

The scope shot is accross the LED when the supercap was at about 0.7V. It shows 3V peaks at about 480kHz

Note:
When I charge the supercap up to 5v and let it run it discharges fairly briskly to about 1V and then slows down, on the scope you can see long coil on times at the higher voltages so the circuit will need modding for a higher working voltage range.

Yucca.

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