Joule Thief With Capacitor

I charged a 30v 3300uf cap in 5 minutes. I fealt they had their benefits but seemed always at the cost of more current.

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Hi in this instructable i will show you how to make a joule theifthis joule theif can be used to charge capacitors.

Joule thief with capacitor. A joule thief circuit is basically an efficient self oscillating voltage booster circuit built using a single transistor resistor and an inductor which can boost voltages as low as 04 v from any dead aaa 15 cell to much higher levels. If no loadled is connected the voltage across the capacitor will rise around 50v with in seconds and connecting the led after powering the circuit will kill the led instantly due to very high voltage. So designed the joule thief was able to produce 34 v voltage measured on the collector node of the npn transistor 2n2222 without any load when supplied by 12v aaa battery filterd with 22uf capacitor.

This way you save yourself a little work and wire. A closed loop regulated joule thief when a more constant output voltage is desired the joule thief can be given a closed loop control. In this video i will show you how i created a very popular and easy to build circuit the joule thief in order to power leds with voltages from 05v to 25v.

In the past joule thief circuits really didnt impress me too terribly much. While that is still true to an extent. A 10 second charging will allow the jt to light for 10 minutes or more.

A 10f capacitor is added to a standard joule thief circuit. Make a super high voltage. The jt can be powered by the battery or by the capacitor.

In the example circuit the schottky diode d1 blocks the charge built up on capacitor c1 from flowing back to the switching transistor q1 when it is turned on. This way less power from the used supercapacitor is unusable. In this project i will show you how i created a very popular and easy to build circuit the joule thief in order to power leds with voltages from 05v to 25v.

If you use the original joule thief design add more turns of thinner wire and choose a good value for the resistor you can get the same voltage range. Joule thief circuit is an oscillatory voltage booster which can boost small amount of voltage around 1v or less to a usable voltage to drive. Quite by accident i got a standard joule thief to produce 100v from a 15v cell with about 50 turns of wire a 2n2222 and a 500ohm resistor.

How to make a joule theif capacitor charger.

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