Judul : How to make an authentic Joule Thief. info : On the basis that it's me who actually named the Joule Thief, it's about ...

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1. Judul : How to make an authentic Joule Thief.
2. info : On the basis that it's me who actually named the Joule Thief, it's about time I actually put up a video showing how to make one. This video shows a version that is true to the original design sent in by the mysterious Z Kaparnik to the Ingenuity Unlimited section of an electronics magazine called EPE. I just loved the simplicity of the circuit and built many of them. Latterly when the Internet "happened" I added it to my website as a project and gave it the snappy name Joule Thief on the basis that it steals all the last energy from a battery. The combination of the circuit's amazing simplicity, functionality and the fun name just developed a life of its own on the 'net. There are a few variants on the design which add extra components to improve efficiency, but a true Joule Thief uses a single transistor, 1K resistor, hand wound ferrite bead transformer and the LED you want to light. The circuit is just incredibly rugged. It can be used with just about any small ferrite toroid or core you can find. It's great for use with the little ferrite rings found in the circuitry of dead compact fluorescent lamps. The wire you wind it with can be new or salvaged lacquered wire (used in transformers and relays), and the gauge of the wire isn't too critical. The transistor is a general purpose small NPN transistor. You can either use the suggested one or just whatever you can find in your electronic hoard.
3. Upload : 13 June 2015
4. Durasi : 33:13
5. Source : www.youtube.com/watch?v=K53beWYdIpc

DOWNLOAD NOW - 33:13

1. HaLo2FrEeEk : This is lovely! I've seen these Joule Thief circuits before, but never this simple. I grabbed the nearest inductor that I had (two windings in a plastic case. I checked the resistance and they were exactly the same), a 1k resistor and I just happened to have a bc547. Wired it up and ran it off a AAA battery reading 1.3v. There's a slight high-pitched squeal coming from it, but it's barely noticeable to my old ears. Pretty neat useful little circuit. One question, how does this react to a full battery, or a higher input voltage?
2. M Wing : What changes would be made in the circuit for a larger EMF? I've seen something about using a MOSFET but is that the right idea? Also some add a capacitor to the circuit. The reason I ask is because I would like to use a fresh battery 9v/1.5v with the circuit so that the entire, well most, of the voltage is used up as the battery wears down. Therefore extending the life of the battery. :O)
3. The Krowing : You should build this into a device to charge phones with a battery.
4. Community Workshops : Thumbs up for the vodka :D
5. chris snowdon : done it used a ferrite rod from a old am radio.wound the inner cores of the wires from some walk man earplug.pulled the unmarked transistor from the same radio.pound land Xmas lights solar panel from garden light. nicad
6. outaspaceman : I built one today and it works..👍 I first came across this idea when I was an admin on The SteamPunk Forum way back in 2006-ish
7. chris snowdon : Hi clive I thought that would be the case.if I can find a old 2n3055 might work?
8. chris snowdon : Hi clive.I run a usb fan from 4 aa,s r echargeables could this give me more running time
9. Mark Giblin : You realize that your JT is responsible for energizing the `free energy` nut jobs...
10. arfyness : What!? That clever pun of a name is your creation!? Well done indeed!!
11. GGigabiteM : I tried to make this circuit on a breadboard and had no success, must be doing something wrong. Whenever I apply battery voltage, the transistor gets very hot and the voltage going out (1.31v) is just slightly less as the voltage going in (1.45v) and the LED doesn't light up. Removing the LED from the circuit doesn't yield a voltage spike, the output will stay around 1.3v. Though it does do something very strange, if I attach the lower impedance portion of the circuit (ie. the negative side) to an earth ground and touch the positive input on the coil, the LED will light dimly.
12. ‫אייל הדר‬‎ : Instead of using a fixed resistor use in potentiometer 10K. Game resistance to change in light intensity in the LED
13. Ron Laws : I had a play around with this circuit, I found that you can use a variable resistor in place of the 1K to adjust the brightness or fine tune it, i was able to get a 11.5v LED module to run at considerable brightness off a single D Type battery. further messing around resulted in the transistor losing it's leg sadly so i put the project to bed, but i'm wondering what the variable resistor was doing for the circuit, the coil i salvaged from an old PSU would even whine and there seemed to be a butter zone with the resistor adjustment before it tapered off and dimmed again, the transistor would also get quite hot. Would love your input!
14. Magikorpse : I don't really understand what's going on but seems interesting, anyone know where I could start to get a grip?
15. Hene193 : I did this too! First time I have ever got it working. I have tried it before and finally it worked. I did the inductor with 0.1mm wire and results are for now pretty good. Is there any downsides for it anyways? Other than it's pain to make the coil. Also I got some coil whine which is annoying but most likely I can lower it with some glue...
16. Arlen Moulton2 : noooo the batteriser returns!!
17. Simon Howroyd : Just built mine, it's great however when you put a slightly m,ore charged battery in there's a really high pitched noise from the switching which is annoying. Measured the frequency across the LED, 4.5kHz so within human hearing...damn
18. Dominik Szymański : How about germanium transistors? Germanium diodes have forward voltage of 0.2V, so as analogy to silicon ones, Joule Thief based on germanium transistor would be able to boot up at 0.2V, and maybe work with 0.1V. What do you think about it? Do you have some germanium transistors?
19. Hannah Tollins : as if. thought i was literally the only one that likes parma violets
20. Mukesh Pandya : Love watching this video again and again... Saw a pile of big box of thrown away batteries at E-Waste, money wasted and not to mention the damage to Env... Such a clever design - All hail to Jeff Bridges of Electronics aka Steve :)
21. MisterTalkingMachine : So *you* are responsible for that name, huh, I had no idea. At some point I made one using an old forged iron bolt as a core, also tried one winding of an audio transformer, and an oscillator coil from a radio, all of those worked. Another thing that I did once, was instead of an LED, I put a transformer coupled with a capacitor, which stepped up the voltage, then I rectified it and charged a cap to about 200 Volts to drive a vacuum tube from batteries.
22. nightcoremixer1 : what battery tester do you use? i like the look of it
23. joinedupjon : I would have liked to see you put a scope on the finished circuit to show the oscillations, not that I don't believe you, just for added interestingness :)
24. mrizkic : still dont get it. so its half rectifier. just a quick question. what if i put 1.5v(full charged battery). how much voltage the output?
25. Joseph Cantwell : Looks like a buck converter
26. Bobby M : Batterizer!
27. Ken Gamble : VERY, VERY COOL ! 😲 I knew there was a reason I have been keeping my dead batteries ! I've been under the impression that the coated wire needed to be treated carefully so as to not damage the insulation but from what I'm seeing here........ maybe not ! Guess it's tougher than I thought ! 😞 Believe I'll make some of these, THANKS ! 👍
28. Andrew Ballard : I watched this and it was relaxing, then i watched it again last night and tried to build a joule thief along with him and it was murder :D He's more dexterous than burnt bread. Still, I now have a large glowing red LED on my desk draining the life out of a zinc chloride battery that will probably start leaking in a few days yaaaaaay! :/
29. Bill Subda : Will this work with a 9v battery? If not what would have to be changed in the circuit?
30. Logan Crane : ew pepsi

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