Joule Thief Circuit Diagrams, Etc....

[Pirate88179]

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[Pirate88179]

http://www.overunity.com/index.php?topic=6123.2330




TheNOP's toroid permeability chart:



The permeabilities or in this case AL factors i.e. ( inductance per 100 turns2 ) are:

TYPE            COLOR        AL                      Freq. Range

T50-26        Yel-Wh        320uH                  power freq. <--- 0 kHz. - 400 kHz i think
T50-3          Gray           175                      50 Khz to 500 Khz
T50-1          Blue            100                      500 Khz to 5 Mhz
T50-2          Red              57                      2 Mhz to 30 Mhz
T50-6          Yellow          47                       10 to 50 Mhz
T50-10        Black            32                        30 to 100 Mhz

There is no standard color code for toroids.
Each manufacturer does it his way.
The color codes for iron powder cores shown in the ARRL handbook are for cores made by Micrometals.

for those made by Amidon see this link:
http://www.uoguelph.ca/~antoon/circ/toroids.htm

to me, with a joule thief, it is almost impossible to saturate a pc power supply toroid.
the current and frequencies we seem to get are too low to do that.

if it work with the led at standard place i don't see why it stop working for a third secondary coil.
unless...
reading 0.00 Volts might still be because of your meter limits.
the hemf are polarised, try your diodes both way.

[Pirate88179]

http://www.overunity.com/index.php?topic=6123.2340

[Pirate88179]

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[Pirate88179]

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