This Youtube video of a 7 Year Joule Thief from Xee2 AKA Xee2vids is similar to my low power Joule Thief I recently blogged. I recently built this very low power Joule Thief. The notes in the video were difficult to read, but this is what I could make out. Notes: 1 – 1″ diameter
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Fellow JT experimenter Quantsuff has been experimenting with a Joule Thief using the 2SK170 JFET, and it runs at 131 millivolts (0.131V), powered by a solar PV cell lit by a table lamp. This is a very good JFET for low voltages; I made a similar circuit a while back and it ran at several
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I built a Joule Thief using a 2N7000 MOSFET with the white LED across it, a standard coil (see below) and a voltage divider connected to the gate. I was trying to find out more about the MOSFET, such as the gate bias voltage needed to make it run on a 1.5V AA cell. The
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This is a continuation of my previous blog. I drew up a circuit (see the photo) and then built it, and I’ve been experimenting with it a little, and have some encouraging results. Time for another blog. As can be seen, the blue LED is glowing dimly. I originally used an alligator clip for the
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I was watching this Youtube video of a Joule Thief that is used as an EMF detector. Actually it is detecting the electrostatic field, not the electromagnetic field. If it had a pickup coil instead of an antenna, then it would be detecting the electromagnetic field. Anyway, it looks like he is trying to trace
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I came across this in a “99 cent” discount store, for a dollar. The UPC code is 39277 75124. They also had the standard garden lights for $2, with the plastic stake to poke into the ground. I bought one of those and opened it up, and found that they had gone cheap, and used
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In the early days of my LED flashlight experimentation in August of 2003 I was experimenting with LED V boost circuits and wrote up the following note. I don’t remember what the circuit was – might have been a Joule Thief. LED V Boost, Low V Input V = 1.503V Input I = 16.3 mA
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I came across this web page with some very interesting Joule Thief designs and I thought I should pass it on to others. If I can find the place, I’ll also put it in my home page. When I started building my LED voltage boost flashlights back in the 2001 to 2003 years, we were
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This, I believe, is the first Joule Thief I’ve built using a European style connector, I call them EuroConns, but Paul calls them chocolate blocks (I’ve never seen one chocolate color, though). I’ve built other things with them. If you’ve ever watched the Youtube videos of Xee2 AKA Xee2vids, you’ll know how handy these can
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I was thinking of Paul’s Joule Thiefs, which use a CdS photocell to shunt the base bias current to negative during the daytime, so the JT stops flashing and saves the battery. But then I thought what would happen if I took two of these JTs, and put the photocell of the first one near
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