Search Results For:joule thief

2014-03-19 7 Year Long Running Joule Thief

A few months ago I came across a 7 Year Joule Thief  video from Xee2vids on YouTube (link below).  It’s a conventional Joule Thief except that the resistor has been increased to 2 megohms, and a 100 pF capacitor has been added from the resistor to ground.  He calculates that the LED  should run for

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2014-03-17 Air Core Joule Thief

A .TXT file I had from 2009, probably from my late great Watsonseblog.  If it had a pic attached, I’d like to add it, but I’m unable to determine what picture. Joule Thief using Air Core Inductor – Feb 13, 2009 I saw Quantsuff’s Valentine’s Day Flashing Heart on Instructables and it inspired me to

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2014-02-27 Adjustable Power Joule Thief

I used an older Joule Thief that I pulled out of the pile to make an adjustable power Joule Thief.  I changed the transistor to a SS9018, put a 1 ohm resistor in series with the cathode of the white LED to allow measuring the LED current.  I left a 470 Ohm resistor between the

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2014-01-14 Watson’s Standardized Joule Thief

I found this picture that I had posted to my late, great watsonseblog.blogspot.com.  I have added my new rustybolt.info/wordpress blog address to it. This is a Joule Thief that uses standard parts, including a readily available toroid core.  This high permeability core can be wound with various sizes of wire, but about ten turns will

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2013-12-12 Battery Capacity And How A Joule Thief Uses It

In late 2000 I bought a digital camera which was demanding of the AA cells, and it  used quite a few.  I decided to convert to NiMH rechargeable cells.  That saved me a good bit of money, but at that time I hadn’t begun experimenting with Joule Thief circuits.  This means that I really never

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2013-12-10 Controlling The Light Output Of A Joule Thief

In a comment, Metis asked: How can I reliably measure and/or control the output voltage of the JT? I’m currently trying to build a small power supply to recharge a Li-ion battery and I’d prefer to be able to keep the output voltage at (or rather below) a known level rather than invest in a

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2013-12-04 Joule Thief As A Final Project For Class

I answered a Yahoo question: is joule thief fine as grade 12 physics final project? Additional Details Is the joule thief circuit appropriate as 12th class final physics project? I have made a joule thief circuit (http://www.youtube.com/watch?v=gTAqGKt64… as 12th class’s final project. Should my high school add this in my transcript for the Universities? Will

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2013-12-02 Photoflash DC – DC Inverter Looks Like Joule Thief

I got this schematic out of an old book, old enough to still use Germanium transistors.  It uses some overvoltage protection diodes on the base.  The 9V Zener and capacitor also look like some form of overvoltage protection. This would have to be modified for a silicon transistor. The battery says 5V, so I assume

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2013-11-12 LED Powers Joule Thief Flasher – More Info

In my earlier blog, yesterday I discussed using a 1 Farad capacitor to hold enough charge to run the flasher for several hours, from dusk to midnight or later.  I checked Mouser’s parts and found a 1F 2.5V capacitor from Bussman for about 2 dollars in single unit quantities.  Kind of expensive but cheaper in

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2013-11-11 LED As Solar Cell Powers Joule Thief Flasher

I’ve seen a lot of Xee2’s xee2vids on Youtube, but I don’t remember seeing this one before.  It’s dated Sept 2011, so it’s more than 2 years old.  The Joule Thief flasher obtains its power from four red LEDs connected in parallel, which are used as solar cells and charge a 10 thousand uF capacitor. 

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