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[WilbyInebriated]

Thank you @wilbyinebriated !

Any working joule thief will do.
Mine has 11 turns bifilar, a 3904 transistor and a 1k resistor at the base.

Jesus

thanks jesus.
1 more quick question, toroid for a core?
i am leaving for the lake soon to do some fishing, so i can't say i'll get it done today.

[nievesoliveras]

thanks jesus.
1 more quick question, toroid for a core?
i am leaving for the lake soon to do some fishing, so i can't say i'll get it done today.

Yes, toroid for a core.

Jesus

[shubhamforme]

hi there,
i found your joule thief circuit very interesting,,but can we use a small value capacitor in it??? also in the circuit diagram... what is the 104k?? is it a capacitor ceramic type or a resistor???
i am trying to replicate i....
thanks
shubham......
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@all

Here is a joule thief circuit that recharges its source battery.
It does not turn on an LED at the same time though.

I know that on @pirate topic there are some people that can improve it with their pickup coil technology and make it to light an LED at the ssame time for the same amount of energy used to charge itself.

It does work if the battery is at least 0.5v and can accept a charge.

Can anyone verify this circuit?

Jesus

[WilbyInebriated]

just built it jesus. my source battery was @ 1.11v.
as soon as i connected it, it dropped to about .37v. it climbs to .58 or so and then drops back to .36 or.37 and repeats. i will let it run and see what happens.

@ shubham
104k is a disc capacitor.

[nievesoliveras]

hi there,
i found your joule thief circuit very interesting,,but can we use a small value capacitor in it??? also in the circuit diagram... what is the 104k?? is it a capacitor ceramic type or a resistor???
i am trying to replicate i....
thanks
shubham......
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Thank you @shubhamforme !

Yes you can use a smaller capacitor with more than 16volts.
The 104k is a ceramic capacitor that has on its face a 104 printed. Sometimes it has printed a 104k instead.

Jesus