Download How a Joule Thief Works Gratis

Judul	:	How a Joule Thief Works
info	:	Step-by-step run through of how a Joule Thief circuit works. Includes how all the parts, the 1.5 volt AA battery, the resistor, the transistor and the ferrite core with its two coils of wire work together to build up energy in a magnetic field which then collapses to produce enough voltage and current to light an LED (Light Emitting Diode.) This includes explanations of the feedback that rapidly opens the transistor between base and emitter to open up the emitter to collector too. And also the feedback that slams the transistor shut again. See also this video on How to Make a Joule Thief (called Make a Joule Thief for Zombie Batteries): http://youtu.be/B61DU7yEsPM For how to make a joule thief power a compact fluorescent light (CFL) watch "How to Make Joule Thief Light a CFL - Jeanna's Light": http://youtu.be/FkLET8MhRbU For all sorts of measurements and demonstrations of my joule thief powering a CFL watch "Fun with Joule Thief Powering a CFL": http://youtu.be/yz_99oVMbSI And also this webpage about Joule Thiefs: http://rimstar.org/sdenergy/joule_thief.htm Follow me on Twitter: https://twitter.com/#!/RimStarz http://rimstar.org
Upload	:	05 July 2012
Putar	:	PC | 3GP High | 3GP Low
Uploader	:	rimstarorg
Durasi	:	05:32
Source	:	Www.YouTube.Com

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1. RimstarOrg - +Vignobles Lac Saint-Jean I've used it for a number of things, which I've shown in other videos. The most frequent use is to power an LED using a battery whose voltage would otherwise be too low to meet the LED's minimum required voltage. I show that one in my "Make a Joule Thief for Zombie Batteries" video https://www.youtube.com/watch?v=B61DU7yEsPM Then I found you can power a CFL using 2 AA batteries by modifying the coils https://www.youtube.com/watch?v=FkLET8MhRbU. And then I learned how to modify the coils again to use this to transmit electricity wirelessly https://www.youtube.com/watch?v=31Rxi8JMIys. Don't be misled by the "thief" in the name. This is just what's also called a blocking oscillator circuit. It provides higher voltage and current by repeatedly building up energy in a magnetic field and then releasing it in a short burst. The higher voltage and current exist only during the brief burst. The total energy out is smaller than the energy in. PS There's no Reply button under your comment because of your Google+ settings. - go to your Google+ page, - in the top, right corner click on your thumbnail icon, - in the popup that appears, click on "Settings". - for the 2nd question down "Who can comment on your public posts?" set it to "Anyone".
2. David Spiller - I used a fly-back core with 80 turns of parallel wire [2 coils] to drive a secondary AC voltage. A 10K resistor with a .01 uf cap across the resistor in place of your 1K resistor and in this circuit configuration it produced a lovely square wave. Without the addition of the capacitor it was off for most of the cycle. The circuit was used to build up a high voltage with ten voltage doublers for experimentation on seeds at 1,500 VDc to see if it effected seed germination.
3. test everything - great video, but if you could speak just a little bit slower it would help me a lot. I dont understand yet why there isnt a drop in the current, and if there is then why doesn't the LED blink? Thanks!
4. Ahmed Elmasry - The correct analysis of the circuit is : when the base current increse to the magnetic current that come from the collector side. The collector curent increase do to base current increasing and so reach to the saturation value at which no more increasing and so the magnetic current transport to the base will stop .As aresult the base current collapse from high value to small value and so the magnetic field on base coil collapse making reverse voltage on the base and transistor stop...so i am different with u in the cauase of stopping the transistor . u said the core saturate what will happen if the core coil is the air ? in this case no saturation ..and i see many circuit work with air core
5. harsh bawari - hi, I can't understand what is the use of resistor. You have not explaind it.

6. zeffur7 - Well done! You've explained the JT circuit quite well!

   Will any general purpose BJT (e.g. 2N3904) work in that circuit? How much current is available in the circuit to drive another/more LED/s?

7. JCmboScience - You have the best explanation out there about a Joule Thief and you really got me interested. I am currently putting together DIY kits to be available on ebay for those who want to experiment with this and not wait a long time getting parts or scavenging for parts. I'd say let's all experiment someday one of us would have that "Aha" moment and the world is changed forever for the good I hope. :)
8. Danne Sundberg - wow the best info i ever got on how a transistor work. 
9. u2ooberboober - So it's somewhat in the likes of a microwave voltage doubler circuit but using an inductor instead of a capacitor to store energy and then dump it additively in series with the battery at the right moment? The circuit uses the higher voltage pulse from the collapsing mag field to supplement the battery....?
10. Pablo Escoberg - I am honestly contemplating becoming a joule thief. muhahaha #OHMshanti
11. Corvinus96 - 1) At the beginning, when the red wire is creating a magnetic field, can anyone explain me why we don't take into consideration the voltage drop that occurs in the red wire? Is it because it is negligeable compared to the increase of current in that same wire caused by the fact that the gates are opening? 
12. Geo Synchronous - can you explain that in primordial cave man form ?
13. steve happe - RimstarOrg, Your videos are always interesting and informative. You might like this: U.S. Pat.# 4734658
14. Pimpmastahanhduece - Basically youre getting more out of the battery so it doesnt dim and last a little longer than full power all the time but less lived. Its excellent for running batteries to exhaustion without suffering power loss. Its an efficiency power input.
15. Ahmed Elmasry - this is asimple explaine to the circuit with my bad english i wish u like it http://www.youtube.com/watch?v=oPkc4WRtI_M
16. ayyanna Vignesh - hello sir im from india, i was poor very in science in my school days, now my age is 25, but i want to learn about physics, and about electronics, i dont wer to start, how to start, tell me from wer if i learn means its better for me, plz
17. ayman zayed - Can u tell what's the value of the base resistance?
18. Kevin Barker - What a waist of time , you can buy a DC step-up transformer on Amazon for five dollars, With a DC volt meter that reads input and out put voltage with an adjuster for out put voltage.. Just saying.
19. GUSTAVO GARCIA - can i use the joule thief for a continuous on off switch.
20. Guido Asder - I have a question: around 2:55 the magnetic field produced by the red coil induces a current (and a voltage) that sum up to the one given by the battery. I can't figure out why such induced current is summing up to that of the battery instead of going against it since the coils are opposing each others. (I hope It's understandable english)

21. Ivan Paul - this explanation helped me a lot. thanks .....

    this is the first time i understood a joule thief circuit completely.....

    i seen lot of videos, but only this one could be understood

22. Bobby Tectalabyss - How a Joule Thief Works RimstarOrg
23. Joseph Stokes - Howdy. The next time you do one of these videos would you consider slowing down your speaking just a bit? Thanks. Great effort.
24. Pilot924 - How is the red wire grounded while it's inducing current in the green wire?
    

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