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Joule thief - getting power from dead batteries Related links: [Piezo power from rain], [EV Gray tube] Home Renewable Energy Science/Electronics Science projects Build Van de Graaff Wimshurst Mach. (27cm) Kelvin water dropper Electroscope Corona motor Crystal radios Fresnel lens Electrets Piezoelectric Electrolytic capacitor Joule thief JT running CFL Peltier/Seebeck effect Franklins bell Can Stirling Big Stirling Enterprise Ion Prop. TEA laser AM Radio Transmitter 555 timer music Materials Power supplies HV Probes/measuring Miscellaneous Efficiency & Conservation Composting Food Non-conv. Energy Non-conv. Propulsion Space Stories Blog The joule thief is an electronic circuit that allows you to make use of batteries normally considered dead. A battery is often considered "dead" when it can't power a particular device. But what's really happening is that the battery voltage is no longer high enough for the device when it's used directly. The joule thief circuit massages the voltage and current coming from the battery so that the voltage is high enough, for periods of time, for the device to work continuously. Connected directly, this batteries can't run the LED... ... but through the joule thief, it works. The LED in the above photo requires 1.85 volts but as the photo below shows, the battery voltage is only 1.27 volts. When run through the joule thief circuit, the voltage is as high as 24 volts, as shown in the oscilloscope output n the photo on the right. Notice that the LED is not always getting power, but it's often enough to keep it lit. Search open in browser PRO version Are you a developer? Try out the HTML to PDF API pdfcrowd.com Search Battery voltage is 1.27 volts but the LED needs 1.85. Oscilloscope output showing 24 volts, occasionally. ► Battery Circuit ► What Is Energy ► 12V Batteries Lamp Recycling - Simple www.simple-cycle.com Safe, Easy and Compliant. National Mailin Recycling Program What the joule thief can run It's simple to get it to run an LED for a long period of time, even starting with a battery with less that 1 volt. People, including myself, have gotten it to run a compact fluorescent lightbulb (CFL) by adding an extra coil of wire to the toroid core. Also, the electronics has to be removed from the CFL so that the joule thief circuit is powering the fluorescent tubes directly. i.e. it must be a gutted CFL. How to make a joule thief Here is the joule thief circuit used in the above photos. The joule thief circuit. open in browser PRO version Are you a developer? Try out the HTML to PDF API pdfcrowd.com 48V Inverter Transistor - The legs of the transistor can be determined by noticing that there's a flat side to the transistor case. See the diagram above. A large number of transistors have been reported to work: 2N4401, NET123AP, BC547B, 2SC2500, BC337, PN2222, to name just a few. LED - One leg of the LED is longer than the other leg. Use this to determine which one goes where. See the diagram above. Resistor - The diagram says use a 1 kilo ohm resistor but I've used an 820 ohm one just fine. I've also seen a 2 kilo ohm one in use. Use whatever works for you. You can also use a potentiometer (a variable resistor) so that you can easily adjust it to select the resistance that gives the best light. Toroid ferrite core - Some people have gotten these by opening up compact fluorescent lightbulbs (CFLs). I took mine out of some device whose original function I don't know. To get it working, my first one had just 13 turns for each wire and I used a 30 gauge wire and a 26 gauge wire. The wire must be insulated. A variety of number of turns will work. This is something you can play with. Look at the diagram carefully to determine where the wires connect to. Joule thief powering a Compact Fluorescent Light (CFL) See this page all about how to make a joule thief circuit that powers a compact fluorescent light (CFL).. Joule thief Videos Video - How to Make a Joule Thief - Making a Joule Thief to power Zombie Batteries open in browser PRO version Are you a developer? Try out the HTML to PDF API pdfcrowd.com The following video goes through step-by-step on how to make a joule thief, along with a little fun about zombie batteries. Video - How a Joule Thief Works This video goes through a step-by-step explanation of how it works. open in browser PRO version Are you a developer? Try out the HTML to PDF API pdfcrowd.com Liked this? Share it with: rimstar.org Digg del.icio.us StumbleUpon Google - Share your project on rimstar.org - About - Privacy policy - © 2011 Steven Dufresne - open in browser PRO version Are you a developer? Try out the HTML to PDF API Related links: [Piezo power from rain], [EV Gray tube] Contact: pdfcrowd.com