Search Results For:joule thief

2014-04-13 Joule Thief As Armstrong Oscillator

In the wiki for Joule Thief on Wikipedia, someone claimed that the Joule Thief is an Armstrong Oscillator.  I dispute that claim and prove it’s wrong in the following discussion. An oscillator is capacitance and inductance ( j.omega )that forms a resonant circuit, and according to Barkhausen criterion, an amplifier that is a linear circuit

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2015-02-26 MOSFET Joule Thief, Sort Of

As the month of February fades away into March, a Google Alert (see note) brought me an actual Joule Thief, sort of.  It looks to me more like a switch mode power supply, with its opto coupler.  That, to me, seemed puzzling since the primary and secondary share the same common ground. I haven’t done

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2014-11-02 Unique Limited Power Joule Thief

I built this special Joule Thief a while ago, and I don’t remember if I wrote a blog about it. I wound the two normal windings on the toroid core, then I wound a third winding of 20 turns for driving the LED. But instead of driving the LED directly from the transistor, I connected

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2014-10-30 Low Power Supercharged Joule Thief

One might think that there is not much point in trying to get more light out of a single battery when the light output is very low and the cell is going to run for weeks. But the Supercharged Joule Thief has proved to be much more efficient and is capable of doubling the the

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2014-10-28 Joule Thief In Wikipedia

I was looking at the references in the Joule Thief Wiki at Wikipedia, especially the first reference, [1] after “Armstrong” in the first line of the text. This refers to an article which describes this as an Armstrong or Meissner oscillator. This article then points back to Wikipedia as a reference. What we have is

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2014-08-28 Waste AAA Cell Runs Germanium Joule Thief

I was out walking and saw three AAA cells in the street.  All three had been run over by cars, possibly several times;  most likely someone discarded them when their camera or whatever had said the batteries were too low.  I picked  them up and brought them home, and put them to good use at

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2014-08-05 Joule Thief Design Ideas

Here is a guy’s photo collection of his Joule Thief artistic designs on Flickr.  He’s come up with some innovative results using various items of plastic, wire and glue to give some cool looking JT lights.  I think this T. Rex might also be used for a note holder or perhaps a third hand for

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2013-06-25 Paul’s Joule Thief

Paul has been busy creating little Joule Thief Jewels out of salvaged household items such as CFL ‘corkscrew’ light bulbs.  He has given me permission to post one here. This is also a cork supported one. I used a reclaimed toroid with 15 turns of new enamelled wire for right winding and a reclaimed double

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2014-04-09 Nichia 3.3W, 225 Lm LEDs And Night Joule Thief PC Board

I left the Nichia LED on the power supply overnight, at about 85 to 90 mA, and it didn’t seem to have any problem.  I decided that I had to design a circuit to drive it from a low voltage, such as two AA rechargeable cells.  I drew up a circuit, which had two transistors

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2014-03-28 Xee2vids Self Running Joule Thief

Background: I should explain what I’ve been considering. My door has southern exposure so I would like to put a solar cell on it along with a long-running joule thief. The LED will be pointed at the keyhole in the lock. During the day the solar cell will charge a supercapacitor and run the Joule

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