Not me, the beasty I made is the LED abuser. Well, maybe me, too. See the photo. I had this high voltage transformer I got a few years ago, and I hooked up a power transistor (2SC2334) to the center tapped winding just like a Joule Thief. The resistor is 180 ohms wire wound. It
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I found that my modified Joule Thief circuits were running at the frequency of 550 kHz, or at the bottom of the AM broadcast band. This is the highest frequency that I have settled on as a satisfactory frequency for a Joule Thief. I have built ones that have gone as high as a few
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I my previous blog I determined that the Joule Thief flasher was not suitable as a flasher, but it was working well as a modified Joule Thief, with better efficiency than a conventional JT. I gave the schematic of the circuit, but I have made many modifications, so I decided to build a second one
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Update: This circuit is much like the Supercharged JT, see the end. A while back I built a Joule Thief flasher, like the one I had seen somewhere on the web, most likely on Youtube. The schematic shows the different arrangement of the feedback winding and base bias resistor. Normally the feedback winding is in
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I received a google alert with this Youtube video of a Joule Thief which uses a C9011 transistor. The notes give a link to the data sheet for this transistor. The actual designation for this transistor is C9011, not 2SC9011 (see note at end). As can be seen in the data sheet, the transistor’s absolute
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I watched this Youtube video where he replicates a circuit from an Instructable on designing an “Any Value Joule Thief”. I read the instructable, and found that the claims made by the author seemed far too optimistic. The Instructable goes through multiple calculations to arrive at values for the components in the schematic. In the
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I blogged a similar light recently, but I didn’t get a good closeup picture of the parts laid out on the back of the AAA cell holder. This time I got a good photo of it before I coated it with clear silicone sealant (I did get a good closeup, it’s in the linnk above).
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I received a Google Alert for a Youtube video from Mongrel Shark showing Joule Thiefs with his version of Tesla’s Pancake coils. He refers to and gives the number of the patent Tesla had on this pancake coil (I haven’t read it yet). He used two coils, each with its own Joule Thief. For some
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I tack soldered this two transistor “Joule Thief” V boost circuit together using one of the 100 microhenry low resistance (0.7 ohm) chokes that I bought from Mouser. I wanted a V boost circuit that put heavy current demands on the choke. The schematic for this type of circuit is here. I made the following
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About March, 2004 I ordered a kit from eBay IIRC, from a guy in another country, might have been Britain. He called it a Linverter. At that time I didn’t have that much experience with DC to DC converters. I assembled it, made some modifications to it and learned more about how to get the
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