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Joule Thief

Started by Pirate88179, November 20, 2008, 03:07:58 AM

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The Observer

#13220
March 30, 2010, 02:29:37 AM
Magnetic Permeability....
You have to understand it to understand coil's and cores !

Detrix..study the chart below and you might get an idea of how the transformer works.

The Observer

Eastov

#13221
March 30, 2010, 03:00:59 AM
Detrix,
  You can use a smaller toroid, or maybe the square type from an old TV flyback transformer.  Here is the schematic which was originally posted with the toroid pic I posted earlier...
e

forest

#13222
March 30, 2010, 03:32:26 AM
Iron is ok, but what about cadmium ? ::)

Pirate88179

#13223
March 30, 2010, 04:05:36 AM
Quote from: forest on March 30, 2010, 03:32:26 AM
Iron is ok, but what about cadmium ? ::)

It has to be soft iron as in soft like not holding a magnetic charge.  Regular iron does not work.  Some toroids are made of powdered soft iron and they work ok too.  You can find these inside cfl light bulb bases.

Bill
See the Joule thief Circuit Diagrams, etc. topic here:
http://www.overunity.com/index.php?topic=6942.0;topicseen

Eastov

#13224
March 30, 2010, 05:47:27 AM
You guys can try air core too, like MK1 & slayer's latest. 
Just spools of wire or wrapped around paper tubes, 
one inside of the other.  You'll have to play around
with their positioning, slide one into the other to
get things going. 
e
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