DMMs All Over The Place – I have more than a half dozen of those cheapo Cen-Tech DMMs from Harbor Freight laying around my house, and I use them a lot for checking the AA and AAA cells that I’m constantly trying to drain with my germanium Joule Thiefs with their multicolored LEDs, of which
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I was discussing with Aki (theledart.com) his JT blinker, which uses a single winding coil, two transistors for the “JT” V booster, and two transistors in an astable multivibrator to blink the “JT”. He asked me to include the schematic. The first circuit boards that I had made from ExpressPCB.com used an astable multivibrator. I
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I’ve been running some AA and AAA cells on a few Joule Thiefs that use silicon transistors until the cell gets down to about a half volt, then I switch the cell to a germanium Joule Thief and run it until the LED goes out and there’s typically less than a quarter volt left in
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I received a Google alert for this website, which is clearly labeled as Joule Thief. As can be seen, the circuit shows two transistors. a single winding coil and a few other parts, which are indicative of a voltage boost circuit but definitely not a conventional Joule Thief. Some people accuse us of being pedants.
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Quantsuff gave me permission to post his schematic of the two NPN transistor voltage booster, often mislabeled a Joule Thief. This uses an NPN transistor to drive the output transistor, which is also NPN. The commonest two transistor V booster uses a PNP to drive the NPN output transistor, and for good reason, as I
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I blogged Anton’s HV JT and noticed that it uses a 2SC945. I googled for 2SC945 datasheet and found a .PDF of the datasheet from NEC. It showed that the absolute maximum collector current is 100 mA, which is way too low for a Joule Thief, which needs several hundred mA. I scrolled down to
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I’ve built an automatic shutoff timer into a regular flashlight, and into my Commercial Killer. Putting a timer into a JT has a very practical use: it saves the battery. I’m not sure why someone else hasn’t tried to do it, maybe just never occurred to them. I thought about putting one into a JT
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High Voltage Joule Thief Schematic – In this Youtube video, we see the circuit connected to and lighting a neon lamp. I corresponded with the author and he gave me permission to post the schematic to my blog. Here is the link (it’s a .PDF). High Voltage Joule Thief The author sent me some closeup
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I think this picture and schematic was posted to my watsonseblog. but it didn’t get posted to this rustybolt.info/wordpress/ blog. It’s a picture of my SJT Flasher with the parts labeled, and a schematic of same (click on the picture more than once to enlarge). I looked in my folders and found another picture of
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