Supercapacitor Joule Thief
video description
i put it as normally shown. its just drawing current and nothing happens, its shunting the transistor.
i flip it the other way around and the BEMF lights it as i would expect.
but i prefer collector to +ve connection, ie, freewheeling across the inductor.
found i can go another LED from junction of primary and base resistor, to collector. theres a large negative spike at the base.
inductor. SMALLER is better. use beads. can find them on SMPS component legs sometimes. tiny. the faster it saturates the better. the faster the field collapses, the higher the spike.
ive tried one with litz wire vs solid, for the extra capacitance. 1 strand of 1mm vs 100 of 0. 1mm.
it works to a lower voltage. but has one strange habit. it doesnt always start up. you have to tap the inductor to get it going. you can hear the effect the extra capacitance has on it, its oscillating at 12k or so, rises in pitch as you move your finger away.
Date: 2020-09-05
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Comments and reviews: 9
Juan
Hello Scott. . I hope you see this, long time since this video was up. . I have had this idea for long time, I haven't been able to find a solution. At home we collect many alkaline batteries from different devices around the house. So i was thinking in using them 10, 20 in parallel or a combo serial n parallel in order to feed a joule thief, at the output of the JT connect a boost convertor to get 5v or 12v in order to power a led lamp or perhaps any other device. Because the lamp or device won't be on all the time, i don't know how to switch the JT on and off in order to make the utilization of the batteries dynamic and efficient. Do you think you could help me with the solution? Thank you for any help you can provide. I enjoy your videos.
reply
Hello Scott. . I hope you see this, long time since this video was up. . I have had this idea for long time, I haven't been able to find a solution. At home we collect many alkaline batteries from different devices around the house. So i was thinking in using them 10, 20 in parallel or a combo serial n parallel in order to feed a joule thief, at the output of the JT connect a boost convertor to get 5v or 12v in order to power a led lamp or perhaps any other device. Because the lamp or device won't be on all the time, i don't know how to switch the JT on and off in order to make the utilization of the batteries dynamic and efficient. Do you think you could help me with the solution? Thank you for any help you can provide. I enjoy your videos.
reply
Nigel
My self-wound inductor on 10 mm long bit of 100 mm nail w 40 turns of doubled 0. 25 dia wire gave inductance of just over 1. 1 uH. On a flat AAA battery (below 0. 9 V) it worked fine without a resistor, running the LED for several days. Analysis and trials with better inductors (3. 4 uH and 1k, for example) found more and stronger voltage peaks at various frequencies as the voltage declines. V interesting circuit t play with!
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My self-wound inductor on 10 mm long bit of 100 mm nail w 40 turns of doubled 0. 25 dia wire gave inductance of just over 1. 1 uH. On a flat AAA battery (below 0. 9 V) it worked fine without a resistor, running the LED for several days. Analysis and trials with better inductors (3. 4 uH and 1k, for example) found more and stronger voltage peaks at various frequencies as the voltage declines. V interesting circuit t play with!
reply
Fred
Good video. Try a Nicola Tesla Flat Coil and a PNP Transistor, as Master IVO recommends to me.
(To night I set up some Flat Coils and different circuits with PNP Transistors - let's see)
The Joule Thief circuit is genius, simple but complicated.
Thank you for this nice video.
Stay well and keep going,
Fred
reply
Good video. Try a Nicola Tesla Flat Coil and a PNP Transistor, as Master IVO recommends to me.
(To night I set up some Flat Coils and different circuits with PNP Transistors - let's see)
The Joule Thief circuit is genius, simple but complicated.
Thank you for this nice video.
Stay well and keep going,
Fred
reply
Bad
Yes, I did like the video. I wish I knew as much as you do when it comes to electronics. You made that hand wound transformer for example. Is that what all those are when I see them in my parts boards. It would be great to know how to use them let alone know how to make them, and to the right size.
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Yes, I did like the video. I wish I knew as much as you do when it comes to electronics. You made that hand wound transformer for example. Is that what all those are when I see them in my parts boards. It would be great to know how to use them let alone know how to make them, and to the right size.
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Имон
yellow ring is not a ferrite one, it is powdered iron (or I dont know how it correctly named in english, but ferrite rings(blue) arent good for such applications either, as it needs to have a gap for better demagnetising. Powdered iron have a distributed gap.
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yellow ring is not a ferrite one, it is powdered iron (or I dont know how it correctly named in english, but ferrite rings(blue) arent good for such applications either, as it needs to have a gap for better demagnetising. Powdered iron have a distributed gap.
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Piano
wait, 22 farad capacitor fully charged only powered the led for 20 minutes? that's less than 1 minute of light per farad! a 1 farad capacitor should be able to power a standard LED for 3 hours with the efficiency of this circuit.
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wait, 22 farad capacitor fully charged only powered the led for 20 minutes? that's less than 1 minute of light per farad! a 1 farad capacitor should be able to power a standard LED for 3 hours with the efficiency of this circuit.
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cjdelphi
Use a QX5252F (found in nearly every 1. 5v solar light) or 20 of them from china for about 1usd
They outperform this jule theif circuit and should give you a good few more minutes of light!
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Use a QX5252F (found in nearly every 1. 5v solar light) or 20 of them from china for about 1usd
They outperform this jule theif circuit and should give you a good few more minutes of light!
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Gameplayer
I made joule thief with old soviet transistor(germanium, lover base voltage) and coil from luminescent lamp.
And i put it to laser. Now it uses 1 battery instead of 3
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I made joule thief with old soviet transistor(germanium, lover base voltage) and coil from luminescent lamp.
And i put it to laser. Now it uses 1 battery instead of 3
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Sky
I have the same flash light years ago. I upgraded it to a bigger LED last year. Its like 30%+ brighter afterward, now i watched your video. I might add a super cap someday. thx
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I have the same flash light years ago. I upgraded it to a bigger LED last year. Its like 30%+ brighter afterward, now i watched your video. I might add a super cap someday. thx
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