Make a Joule Thief

[Waddeell40]

will this work with a PNP?

[TheSupertecnology]

Hulk at 3:54

[martianquasar]

All lies, tried, didn't work, crap!

[AlBarathur]

Just a reminder as you are transforming the battery voltage into a higher voltage, the current consumption from the battery increases as well, which basically means, yes, you can use 1,5 v battery to do the job of 2x 1,5v batteries (3v) but the battery will die also double speed at least. Still this is a pretty cool project, I just wanted to remind people that you cant make energy out of nowhere, and 1 battery cannot replace 2 for the same amount of time. Thanks for the video. I like it.

[teddybear0504]

@AlBarathur

Exactly so. It is just ordinary oscillator with transformer.

[venomousfish]

Precycling!

[TopMagneticGenerator]

If you want a weekend project that you can enjoy

Try and build a magnetic generator

Go to Google - and Search for ...

"Top Magnetic Generator"

Click the First Result (Not the advertisements)

[flyingpnda247]

if you used a full battery, will it short out the device? or will it work fine?

[freethisone]

ready for the free this energy circuit?

please go viral. sorry not to hijack, new info concluding.

"the free this energy circuit" you must give me credit, and you cannot sell, just teach.

i always loved this video, great work..

[1point61803]

How does this work? Did he just make a transformer?

[JesusHChrist2000]

@1point61803 Yes and no. Wikipedia.

[leoblaster101]

I have a bar ferrite toroid will it work

[JesusHChrist2000]

@leoblaster101 If its a bar it's not a torroid.

[leoblaster101]

I love ur videos and keep u r good work

[MrJouleJr]

would anyone happen to know the inductivity of that toroidal winding???

[mars3554]

I'd wish you would go into the theory of operation behind this.

[buddyguy09]

interesting.....

[iamdarkyoshi]

mine worked so well. 1 volt into 6

[c0pyimitati0n]

THANKS!!! this works great! im gonna try and use it to power an led hula hoop with a single aa battery...

[whackitov]

1.46...'were gonna wind them round......'.......' times'......how many times? that bloody tune kicks in right there and i simply cannot make out how many times you say to wind it

[jake22481]

@whackitov about 8-11 windings i think

[whackitov]

@jake22481 thanks :D



[ronald3729]

can i use any other transistor in this circute? (i beg u please respond)

[humxa24]

@ronald3729 yes any small signal NPN transistor should work

[Denpruttandetjejen]

I remeber watching this years ago!

[lokeycmos]

can the circuit be 'tweaked' by using different numbers of turns or by making one side of the coil more or less turns than the other side?

[Electronic2011guy]

butt chin

[ChedderCheeser1]

y blue or white? not real rit?

[Chamillionaire791]

hello i don't have a NPN transistor i can't use a PNP transistor but change the + -

[firedude201234]

shit!!! i just spent an hour painfully soldering only to realise i did 2 connections wrong D: DAMMIT!!!! oh and i added a power switch in line with the battery :D

[Alex1M6]

@firedude201234 lol how can anyone possibly mess up on this circuit?

[clrathnayake]

good louck brothers. you are doing a great job. :-)

[hunterboyvids]

Will a ferrite magnite that is round work??

[Knuckles1111111111]

Will These circuits Run 5 LEDs? at once? Please answer Quickly!

[3asiancubers]

Why does his finger make a weird noise when he touches the table (1:09)?

[969SobiasTokeS696]

Your videos remind me of 'ScopeTV'

[123456789robbie]

hmm.. we could take a bunch of dead batterys, and use them to recharge a rechargable battery.. hmmm

[ImmortalAcorn]

Could this be used for things that use higher voltage? Like 5v or 9v circuits?

[chilidress]

ferrite rod does the same thing?

[CocktaiLMolotovX]

HEY, when I arrive for to remember the joule thief schematic, I see than 666 persons like that. Is the joule thief satanic????

[WetCoyote]

I built one and it worked beautifully. My second didnt. I had crossed the winding pair on it so a re wrap, and it worked as well 8-)

One thing I found right off the bat, i could not get just any wire to work on the toroid. I eventually gave up and bought a roll of enameled transformer solid core wire. That made all the difference with just 10 windings.

[trapingman]

do you need this so called "toroid" or will any ring-shaped object work?

PLEASE RESPOND!!!!!

[SuperHaloslayer123]

douse it only work with wight or blue led

[n7275]

Use a heat sink when soldering LEDs or transistors or ICs.

[a4d2d0]

I am trying to get this to work with a 4v laser pointer. But I can't seem to figure it out. sad.

[ankit3114]

hey! i tried to make one but mine doesn't seems to work !!!! please tell me how many turns the toroid needs and which side to hook the led to the transistor.........

please tell me !!!!!!!!!!!!!!

[TheJG1947]

Hi Guys,

I did try "your experiment", somehow I cannot seem to make it work.

On a single double AA battery it won't light up, with two, it kind of lights up but the light is feeble, only with three double AA battery is really bright.

I followed it to the letter I think; could it be that the toroid has few more turns than yours?

[Pirate88179]

@TheJG1947

You may have several problems. First, is your toroid ferrite? Sometimes folks try powdered iron toroids (usually painted green, yellow, etc) which can be made to work but you need a different set-up. If you do have a high permeability ferrite, it may be that you crossed your windings where you take one from each side like they said. This can be a bit confusing at first but it makes all of the difference. BTW I can light over 400 leds from a single AA using my JT circuits.

[miller1636]

i call shananigans

[LesMuise]

precycling! lool

[ciprianwiner]

this circuit works with PNP , to get it work just put the coil at the (-) and the Emitter at the (+) of the battery, enjoy :D

[fataxe1]

so its a transformer? but with only one coil?

[mmaaxx1198]

I used to go to Big Clive's site way way way back in the day, back in the days of 14.4.

[MohoBiechiz]

see the real problem here is that the duracel battery is a big fat bitch.

end of story

[shawnde1]

"This is like recycling, before recycling"...wait what?

[MyNoveltyAccount]

@shawnde1 pre-cycling*

[PlKatxu]

I wish my soldering iron could make that noise when i use it. 2:54

[Alex1M6]

@PlKatxu Oh, you mean mine shouldn't be making that noise?

[janniammlive]

han trur han er tøff in the fitte sei benarne

[humxa24]

i made it into a flash lite and i makes a beeping noise when running but works great

[ciprianwiner]

thanks and fuck al those haters that can't even understand such a simple circuit

[keleprus]

what type of transistor is not hear good values

[Mushketer888]

@keleprus i think common NPN like 2n3904,bc547...

[wopitax]

i watched the video because i thought that it was a jewel thief

[TheKaos90]

but can't we switch the 1k resistor with something that uses the energy , instead of wasting it ? it would still protect the transistor ..

[ciprianwiner]

@TheKaos90 you're NOT wasting energy by putting an resistor,you SAVE it because if you hook up let's say an 33k resistor you get so less power consumption that it can run for months, i hope this helps :)

[felicitotayao]

AMAZING WORK!!!! can i use this thing to my generator to increase voltage. Please visit my channel. Thank you!

[josephdupont]

Your circuit is not like the wiki circuit

whose is correct.with yours what difference does it make which lead you use if

the two opposite are shorted out.

[trcwm]

And by "inspired" you actually mean copied.

[trcwm]

Show a proper schematic next time! This is completely useless.

[ALEFILES]

and how about the NUMBER OF TURNS??? how many winds may I make? 1, 10, 1000, 10000000? it would be better to put some number in the video for more explanation!

[mscir]

Any chance you guys could hook up an oscilloscope to show us how it works?

[scmxyzzy]

I made this joule thief circuit. I have a magnifying visor with a white LED lamp on either side. I placed the jewel thief on one side with a single AAA bat. and used the normal two AAA bats on the other side. The joule thief side runs brighter. After 345 minutes of on time, the joule thief side still produces usable light, whereas the normal side is just a dim light. I am not sure about the wisdom of totally draining a bat though. Alk. bats will leak, and not good for NiMh either.

[AurimaxII]

Why exactly white or blue?

[beehard44]

lol cat5!

[droid7627]

CALL TO ACTION

[liberatepoverty]

You are absolutely genious man! this circuit worked perfectly well, after a few mistakes when at first it didn't, then after i corrected a few mistakes it worked fabooulsely well. well done.

This circuit has great uses, mainly to illuminate high brightness LED which require significantly more voltas than normal red LEDs.

[TheEXTRAtesco]

IT HAS TO BE BLUE OR WHITE Muhahahahahaha

[Scout33691]

does it have to be a LED

can i use it for other stuff?

[gaussman08]

@Scout33691 anything :B

[seansroflcopter]

Are u gay cuz ur both always in the same vid

[cveyron]

hi, i make a Joule Thief but not working

[cveyron]

hi, i make a Joule Thief but not working

[quigglebat]

lol americans say sodder instead of solder.

[Kokomokox]

@quigglebat because THE L IS SILENT DUMBASS.

You stupid europeans always say words stupid. "solder" "aluminium" "meter"

etc.

[FODKV]

@Kokomokox ma jebati Bog mater glupu američku, konjino jedna, kad bi barem znao di je Europa

[adjuk]

Great video - many thanks for posting it. There are other videos which show how to make a battery charging circuit from this....

[dingo27mobile]

What was that transistor?

[Dark0Lord7]

Can I use more than one LED if I wire the positive lead of the 2nd to the negative lead of the 1st?

[GHOSTTOYS]

where the heck can i get a freakin ferrit turet or something like that .. does it work with donut shape magnet ..

[Dark0Lord7]

@GHOSTTOYS If it's made from ferrite, yes.

[kpgcfd]

I bought a Joule thief kit from madscientisthut , I really like the PCB in the kit it was easy to put together. It would have been nice if they included wire to connect the battery. They also had some nice white LED packs too, i bought one of the 5mm LED packs they are pretty bright, left spots in my eyes for an hour.

[jacob7young]

what?

[NikySportsPromotion]

isn't that just a transformer?

[ciprianwiner]

@NikySportsPromotion nope it's not an transformer it's a let's say voltage boosting device :)

[firedude201234]

@ciprianwiner

its not a transfromer

[SuperHaloslayer123]

will a 2n3906 work



[SilkyTP]

And what exactly is the point? You can make a flashlight that works on an almost dead battery? Can't use the battery otherwise (shrug)

[StarNinja100]

LEDs use a lot of money thumbs up if you agree one LED cost 1.50 DAME

!!!

[russianradical]

@StarNinja100 wtf i get mine for a rate of 50 LED's for 2.35

[TheMusicPiper]

@StarNinja100 ebay baby :) 1000 for £7

[psptodon]

CHEDA NO AYUDO EN NUESTRA TAREA DE ELECTRONICA

SALU2

[Ritari2000]

It works. Took a small (15mm diameter) toroid and wirepair from cat-cable. In toroid there was only room for 11 turns but it works. The other components were bc547, 1k resistor and white led

[MultiCreek]

LED won't light on his 1.5V battery becouse he reversed the polarity of LED...idiots

[ciprianwiner]

@MultiCreek if you were so smart you would know that led's don't light up at 1.5v ...idiot

[MultiCreek]

@ciprianwiner yes they do...

[l0n3lysk8er]

Which Volume of make was this in?

[ericdalgetty]

so lets say I want to use a 9v instead of a aa, what would i need to change? please respond

[ciprianwiner]

@ericdalgetty lol with 9v you will need an big inductor with many turns and you need to vary the resistance but with 3v you can charge an big capacitor at 370v ,so yeah...

[chacarere]

@ericdalgetty you need to lower the voltage you nead to use a +/- 470 resistor in series with the led so take out all the other components

[fulanoeljitano12345]

@ericdalgetty just use a resistor to make sure you dont fry the led.

[ChedderCheeser1]

@ericdalgetty wow. the voltage needs to be LOWERED if you want to use leds. Just use a resistor. or did you mean a DEAD one?

[CocktaiLMolotovX]

This video is one of the best video of youtube. Thank you.

[crookedcreekstudios]

your finger looks like a toe haha. good job i like this. thumbs up!

[Rodrick58]

will a yellow and wire work to?



[crafty25936]

@Rodrick58 any wire, as long as they are 2 different colours

[The4LA2Baker0]

"pre-cycling"

Nice



[TheBlacksabbathfan9]

Bree is a dick

[scorpionkings]

Why don't you just call it what it really is? A home made battery tester!

[1xDRCx]

@scorpionkings it's not a battery tester, when you have batteries that don't work, it means their voltage has dropped to low to power a device, the joule thief takes the leftover power tha battery has put's the voltage up and makes it usable.

[robert0joe]

Can i use Red, Yellow, Green, Orange LEDs?

[Janigut]

@robert0joe

Red LEDs work here. Green doesn't.

[Pirate88179]

@Janigut

If you make it right, you can use any color led you want. I have used several 10mm ultra bright leds with this design and they light very well. More advanced JT circuits can light over 400 leds from a single "dead" AA battery. I have many videos on these.

[Shoyrou]

wth -.- jewel thief?

[ShadowBlade448]

It looks like the Mini ARK reactor on Stark's chest...

[JacksonElE]

dude ist works  yeaay

[greenpogo]

this is cool, but is it efficient really compared to other step up methods?

[castlefreak117]

my head meat hurts now..... ._.

[brandon14872]

@castlefreak117 why

[castlefreak117]

@brandon14872 too much smart makeing for my head meat.....  ._.

[jsiuksta]

What if I made a number of Joule thieves and put them in series? Would it work? Would I increase the output even more?

[crapmaker6]

@jsiuksta Yes, but you could get the same effect by doubling the windings through your coil :)

[moviejacker]

wow a step up transformer then an amplifier npn?

Not new tech. read some old newbie electronics baby books.

Electronics is fun, Sometimes.

[shortyskaraoke]

Thanks for the vid. I built one and it works great. After tinkering with it, I've found that it works with some d.c. sources and not on others. Does it have any voltage or amperage limitations that would make it not work? Just curious if there was a way to step it up for larger applications. Any help or ideas would be greatly appreciated. "Have a great weekend"

[spanglerangle]

can i hang out with you guys  your the best

[Roxas131413]

Step-up converter? Sweet! ^_^

[DeadNetworks]

Pony Tails FTW :P

[drberk30]

pretty cool....

[ustube27]

aaaaah tiny url

[Scrixx]

Mine doesn't work.. is it because of my wire size? I'm using really thin wires.

[RossHogan1]

@Scrixx Make sure that the wires from the coil that conect to the battery (it is really a cell) postive are taken from the start of one winding and the end of the other. Secondly test it at first with a fresh cell (make sure it is the right way round). Thirdly see if the LED is the right way. And lastly make sure the transistor is correctly orientated. Then it should work. Good luck

[UltraMif71]

I've made one of those after I watch this but i didn't add the resistor. Now a Button Cell can power the LED!

[m60man12]

I see green people

[NuVanDibe]

austin tx? thats where i live

[AxelTiger]

is the core with the red and blue leeds coming from it essentially a primitive transformer!?

[Dark0Lord7]

@AxelTiger No, just an inductor.

[RossHogan1]

I have been able to run a 1W computer fan (12V) off this device using an Ultra fast diode. At this power the circuit is drawing about 1A from the AA cell. Another one I built has been running a standard LED off of a flat AAA cell for 6 WEEKS! So far…

[RossHogan1]

It has stopped working at 9 weeks

[RossHogan1]

This happends at any were from 15000 times a second (15kHz) to over 700000 times a second (700kHz) as humans can hear frequencies up to 20kHz you can some times hear the high pitched wine from the circuit. This also explains why you can here this on an AM radio (530-1200kHz).

[RossHogan1]

When the current flows through the second winding it induces current in the opposite direction in the pick up winding. This current causes the transistor to turn off. When the transistor turns off the energy stored in the inductor has no were to go. So the inductors will increase the voltage until current flows (through the led) at witch case the process restarts. Continued…

[benjwgarner]

@RossHogan1 So the toroid acts as both a transformer and a simple inductor? (Yes, I understand that a transformer is a type of inductor).

[RossHogan1]

@benjwgarner The Secondary winding acts as a pick up coil and carries very little current and so in a way acts a little like a transformer. In fact you can use a transformer to make a Joule Thief

[crafty25936]

@RossHogan1 blah blah blah it makes the light thingy light up

[Edge123455]

@RossHogan1

Wait, so this circuit is transforming dc into ac but at a really high frequency? As the transistor turns on and off?

[RossHogan1]

This is basely a self-oscillating boost-converter (look it up). It the way it works is that current flows from the 1.5V cell through the pickup winding on the torrid, then through the 1k resistor and finally through the base of the transistor witch turns it on. (The resistor is to limit the base-emitter current to about 0.7mA) When the transistor turns on it allows current to flow through the second winding (an inductor). Continued…

[TheLhill123]

@RossHogan1 way to much talking.......got milk?

[MrSurfsAlot]

alright so i can make all this stuff, but i wanna know how it works..and make this stuff for myself without having to go to youtube.lol someone tell me like a book to buy or some shit..

[themodmancarl]

umm a capacitor

[rafkristoff]

is that the same as voltage multiplier? Where your aim is raising a 1.5V to 3V which is the threshold voltage of the LED. Where that name came from? Joule is a unit of energy, can it be renamed as Volts Thief?...lol

[humxa24]

thats awesome i made it and it worked thnx for your vid

[kfstevens2370]

It’s spelled correctly. Joule is the amount of work done when one coulomb of electricity flows under a pressure of one volt, one watt = one joule per second or 60 joules per minute.

Joules experiments 1843-50

[misteravocado5]

@kfstevens2370 Lol you totally missed the pun. They're assuming that we don't know that and we think they mean jewel thief, which would not refer to an electronic circuit.

[TheRealVerbz]

When you say that we need a ferrite toroid..... do we need a non magnetic iron donut or magnetic donut.

Can I use non magnetic neodymium, or should I use magnetic neodymium?

How many turns on the toroid?

Will the power of the toroid and windings determine how much more power you get?

What are the circumstances?

:o)

[PSPGlover]

why does it only work for white and blue?

[lll961]

@PSPGlover It only works for white and blue is because other LEDS require different voltage to work. ;)

[spored100]

great

[toiletseat1327]

how sad is your life

[toiletseat1327]

how sad is your life?

[psion0027]

dude i need one of those joule theives

[wcocowcocow]

Would this work with a mosfet to make it more power full?

Thanks.

[TheRealVerbz]

When you say we need a ferrite toroid, do you mean plain iron or magnetic?

How many turns should the coil be around the toroid?

I'd like to see you guys combine this with the "Bagdad Battery".

And have you heard of Jeanna's Light?

watch?v=11nzbi59T7w

[MrCelloman21]

this could be used as a flashlight

[Magneticitist]

it works like a small step up transformer except its also pushing more mA out of the battery. there are many variations that can be made out of this circuit to suit ones needs, usually in the form of mini-HV power supplies like those used to light fluorescents. look up chilliqueen's resonant circuit to see how to make one without a toroid core.

[uchihasharigan56]

you have a big butt on your chin

[Rickehej95]

but what does the ring do?

@Rickehej95 The ring acts as a core for the inductor, but idk its purpose in the circ