Joule thief circuit pdf files

This circuit is also known by other names such as blocking oscillator, joule ringer, vampire torch it can use nearly all of the energy in a singlecell electric battery, even far below the voltage where other circuits consider the battery fully. Joule thief circuit powering a compact fluorescent lightbulb. See more ideas about joule thief, joules and motor generator. A single aluminiumair cell cannot produce a large enough voltage to drive an led, thats where the joule thief. But the real reason is that we wanted to design a joule thief circuit that had some. This is not possible with a simple joule thief circuit. Could be my circuit, but with the battery voltage at 0. That third coil and the cfl are the only additions to the regular joule thief circuit. One example you can reference is a video on you tube called jeannes light, or this other one by lasersaber called joule ringer and joule ringer 2.

Joule thief are small, fun circuits which exploit a few characteristics of electronics and leds in order to steal virtually all of the energy stored in a battery. Really, i think that nearly everyone interested in electronics have seen this circuit at least once. What a joule thief cannot do is operate with very low voltage and current sources. Question 1 instead of using a transformer or winding a toroid coil. It takes a steady low voltage signal and converts it into a series of high frequency pulses at a higher voltage. The advantage of using the joules thief circuit in this setup is that it will boost low voltages to higher usable voltages. When power is first applied, current flows from the battery through the 1k resistor and one winding of the transformer into the base. Make a joule thief this weekend, make a super little circuit called the joule thief. The joule thief makes a great little light for field day, night light, camping light, and even one missionary intends to use them in africa. It seems that many joule thief circuits depend on a clunky bulky and heavy toroid or donut that has to be carefully wound with copper wire.

Joule thief very very very low input 0,035 volt by larskro. The led was connected in parallel or serial circuit configuration. The open circuit output voltage of the joule thief in this circuit was about 31v peak. Theres also one change and thats to change the normal low power transistor for a. This circuit boosts the peltzier output up to 14 volts by. This cool sounding circuit is astonishingly simple just a coil which you could wind yourself, a resistor, and a transistor. How a joule thief works the joule thief aka blocking oscillator is an electronic circuit that allows you to make use of batteries normally considered dead.

To be called a joule thief i think a circuit needs to be able to start when its input voltage is below 1. Joule thief led night light juneau economic development. The joule thief this following pages contain an example logbook that a student might have written while performing an experiment where they built a joule thief circuit. Pdf joulethief circuit performance for electricity. The most basic schematic for a joule thief circuit this and the next pic are from how to get what you want.

Joule thief circuits got a bad rap some time ago because some people in the overunity, freeenergy crowd went nuts over it, so lots of people wont really spend any time talking about it. Question 2 is the 1n4148 diode neccessary in the above schematic. Get the last bit of life from those supposedly dead batteries. It produces a similar amount of light as the led torch on a smartphone. Technically it may seem impossible to illuminate a 3. Turns out, you still cant get something for nothing. Pdf joulethief circuit performance for electricity energy saving.

I wanted to create a joule thief, which can be used to supply some small electronic devices, but. Joulethief circuit performance for electricity energy saving of emergency lamps view the table of contents for this issue, or go to the journal homepage for more 2017 iop conf. Jt joule thief circuits are usually poorly designed or not really designed or show signs that the people who produced them did not have a good understanding of what they were doing. The down side of this circuit is that there are conversion losses, but. A suitable driver transistor, like the 2sd965, 2sc2500, 2sc2655 must be used.

A joule thief is a selfoscillating voltage booster. Friends in this video i will show you joule thief circuit. Contribute to diysciborgjoule thieftorch development by creating an account on github. It can even take a battery that wont even power a basic led by itself when it is brand new 1. Its simple and cheap can even be assembled using parts from old cfl and incredibly easy to build. The result show that the joulethief circuit able to supply led circuits up to 40. Although this circuit is low power, it produces enough light to be a usable torch. Joule thug a joule thief bug bacteriophage hackaday. Easy joule thief soldering kit from makersbox on tindie. Without load the led i have measured voltages over 30 v. A highpower joule thief type circuit to drive a 1watt led from a 1. I chose the older, more compact version, and it was easy and fun to build. Heres what it looks like if you dont know how to read a. This circuit is also known by other names such as blocking oscillator, joule ringer.

But now there are several very small 4 legged ics available that do the job using only a simple inductor, single cell battery and a led. The same reason goes for regulating the output voltage. I keep that battery around to find the shutdown voltage of the various joule thieves that i made. The transistor does affect how low the circuit runs to. The joule thief circuit puts a heavy demand on the transistor for high current at very low voltage. Joule thief kit this kit is a version of the popular joule thief circuit, it uses power that would normally be wasted from used aa batteries to power a bank of 6 hi brightness white leds. Well, simply put, a joule thief is simply a circuit that utilizes the remaining. The joule thief is such an easy and simple device, but what it does is amazing. Thats because one volt is one of the definitions of a dead single cell battery. Note that you do not need to write your logbook exactly like this one in order to get full marks. Yx8018 led driver in bunnings lytworx solar garden led lights mcauseryx8018 solarleddriver. The peaks in voltage occur rapidly, causing the led to flash at a very fast rate. Its not a complex circuit, but it really doesnt need the 2n3904. The pdf file that goes with the podcast is here 450 kb pdf file so whatsa joule thief.

This page has two variations on the original design to use the simple circuit in a. The pcb layout in the tif file below has the windings clearly marked, and. However, the led appears to be constantly lit to the human eye due to the. I assembled my joule thief in about 45 minutes, and i was taking my time. Joule thief circuit is popular among electronics enthusiasts. A joule thief is a minimalist selfoscillating voltage booster that is small, lowcost, and easy to build, typically used for driving small loads. So if a circuit can start up on less than that its stealing energy that would have been thrown away if the dead battery was put in the hazardous waste. A suitable driver transistor, like the 2sd965, 2sc2500, 2sc2655 must. The second winding has been replaced by a pnp 2n3906 and c1.

To get a positive outpit voltage youd need a voltage inverter circuit which is so comparatively complex it negates the use of a joule thief to harvest the last bit of energy from a battery. To make a joule thief battery charger is a quick and easy project. In effect, the 4 legged ic replaces the clunky toroid. But whats really happening is that the battery voltage is no longer high enough for the device when its used directly. The joule thief is a fascinating and simple circuit that is able to produce a usable voltage from a low voltage source. Experiment with joule thief circuit do it easy with. Overunity joule thief the circuit has almost nothing to do with joule james, i just lie to remember him december 17, 20 getting it to work i s a lot easier than explaining why it wo rks 2 leonard teasca, bsc electrical engineering phone no. The joule thief circuit using solder islands cut from a wax paper cutting strip. Joule thief operation and the supercharged version. Most joule thief circuit schematic specify the use of 1 or 2 coil. Since a pile of dying batteries keeps growing, i decided to give it a try. Joule thief detailed construction north fulton amateur radio league. A single aluminiumair cell cannot produce a large enough voltage to drive an led, thats where the joule thief comes in.

If you want to drive a larger led or two or more standard leds with more than 100 milliwatts, then you will need a higher current transistor specially made for switching very high current at very low. This week, windell oskay of evil mad scientist laboratories joins me to teach you how to make a super clever little circuit called the joule thief. In april 2005 i built a joule thief circuit is in my blog and at the bottom of this webpage that used both a 2n3904 bjt and a 2n7000 mosfet, with the 2n3904 starting the circuit and the 2n7000 then supplying most of the current. Theinstantmatrix talk contribs information description en1a regulated wjoule thief circuit with closedloop control and low drop out secondary regulator to power some voltage ripple sensitive circuit, like a microcontroller. In this weeks weekend projects video podcast, make magazines bre pettis and i show you how to make a joule thief. The joule thief allows you to squeeze the life out of what most people think of as dead batteries. The pdf file that goes with the podcast is here 450 kb pdf file.

The nightlight in a box, using either a dead aaa battery or a dead aa battery. It has many implementations but probably most common is very minimalist voltage booster based on npn transistor, coil, resistor, and led. There seems to be several variations of this nifty little circuit on the. An analysis of a joule thief circuit embedders life. Pretend for a moment, the battery in the moment isnt connected. However, the led appears to be constantly lit to the human eye due to the persistence effect. Highly recommended as an introduction to soldering and electronic principles. This circuit can be most often seen lighting an led with an almost dead aa battery. The normal joule thief circuit has only two coils, but as you can see in the above circuit diagram, this one has three. Aluminiumair batteries are also interesting they can be made from throwaway materials. A joule thief is a circuit that allows you to use the energy the joules still left inside a battery that is dead. It can use a battery that is not usable in any other electronic device and give it life again. The circuit diagram for a joule thief is shown on the right. This circuit used in this project is a modified joule thief.

A joule thief circuit is basically an efficient, selfoscillating voltage booster circuit, built using a single transistor, resistor and an inductor, which can boost voltages as low as 0. See more ideas about joule thief, electronics projects and diy electronics. The joule thief aka blocking oscillator is an electronic circuit that allows you to make use of batteries normally considered dead. Jones while experimenting with a simple overunity concept. Its primary intent is to squeeze the remaining juice of dying batteries to light a led. Is it possible to use ready made inductor, those that look like surface mount resistor. A joule thief is a circuit that allows you to use the. I am in the process of building a battery charger this week and will put data about this project as i charge batteries. A joule thief is a play on words because it allows you to steal watts from dead or inefficient batteries for many, many seconds, if not weeks. The joule thief circuit is a voltage booster circuit which converts a constant low voltage input into a periodic output of a higher voltage.

Its a little wisp of a circuit that allows you to drive a blue or white led from a low voltage. But whats really happening is that the battery voltage is no longer high enough for the. It takes about 14vdc to forward bias and light the four leds. The instructions were thorough and easy to understand.