Search Results For:joule thief

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

Flashers and attention getters Free Energy Joule Thief SMPS DC-DC Lighting Renewable Energy
on November 11th, 2013 by - No Comments

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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2013-11-05 Blog Uses Joule Thief As Battery Charger

Free Energy Joule Thief SMPS DC-DC
on November 5th, 2013 by - No Comments

I got a Google Alert that pointed to a facebook page for a Joule Thief.  In that page I found a link to this UK blog about using a Joule Thief as a battery charger (click on the link to the .PDF schematic). The Joule Thief circuit is a typical example of a conventional JT. 

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2013-10-30 Mechanical Joule Thief

Joule Thief SMPS DC-DC Magnetics & Electromagnetics (not coils
on October 30th, 2013 by - No Comments

What would you say if I told you that I could make a Joule Thief without a transistor or other electronic parts, just a single mechanical part? Would you believe me? I have seem this method used many times in old radios and old equipment made before transistors were born. It’s not magic! You may

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2013-10-27 Low Power Joule Thief With Photocell

Joule Thief SMPS DC-DC LEDs Optoelectronics
on October 27th, 2013 by - 3 Comments

One Joule Thief I have not built (at least not in the same JT) is the low power JT with the CdS photocell.  Almost all of my JTs with daylight shutoff used a LED as a light sensing diode, and then most were flashers.  I have a bunch of CdS photocells but I haven’t really

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2013-10-23 Smooth Joule Thief

Free Energy Joule Thief SMPS DC-DC Lighting Renewable Energy
on October 23rd, 2013 by - 2 Comments

I came across a schematic of a “Joule Thief” circuit, actually a two transistor LED V boost circuit, on OverUnity.com.  This is part of a garden light, and has a solar cell to recharge the battery, and the battery to store the electricity until after dark.  The schematic, dated 10/16/2013, was drawn partially upside down

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2013-10-22 Transistor Behavior In A Joule Thief

Joule Thief SMPS DC-DC Transistors
on October 22nd, 2013 by - No Comments

I was reading some of the thread over at OU about transistor behavior.  The discussion was about the BC337-25 and the 13003, which is often found in CFL bulbs.  One poster said the 13003 was rated at 1 amp, and the BC337-25 was rated at 0.8 amps.  But in the Joule Thief the BC337-25 drew

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2013-08-18 Supercharged Joule Thief Pictorial

Joule Thief SMPS DC-DC
on August 19th, 2013 by - 10 Comments

I received a request for a pictorial that shows the wiring of a Supercharged Joule Thief.  I redrew the one here to show the wiring of the SJT.

2013-08-10 Very Low Power Joule Thief Update

Joule Thief SMPS DC-DC
on August 10th, 2013 by - 2 Comments

I blogged my experiments with this very low power JT back in April, and I connected it to a cheap ‘heavy duty’ AA cell and left it running for a month or two.  I added updates to the end of that blog I made one mistake: I should have taped a post it note to

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2013-08-06 7 Year Joule Thief

Joule Thief SMPS DC-DC
on August 6th, 2013 by - No Comments

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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2013-08-02 Joule Thief, MOSFET Test

Electronic Components Field Effect Transistors FETS Joule Thief SMPS DC-DC
on August 3rd, 2013 by - No Comments

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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