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Overunity Machines Forum



Joule Thief

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

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Dave45

#16710
October 25, 2014, 10:30:01 PM
I replaced the resistor with a diode, it works.

MarkE

#16711
October 25, 2014, 10:38:21 PM
There is no reason it shouldn't work with an input voltage that is high enough to overcome the diode forward voltage drop and a large enough capacitor.  I am not sure what advantage you think the diode introduces.

TinselKoala

#16712
October 27, 2014, 05:28:11 AM
I'm curious as to why the Basic JT circuit, with 1:1 inductor ratio, will work with (some) reversed transistors. The NPN circuit will work with, eg, BC337-25 reversed E-for-C, and the PNP circuit will work with BC556B reversed E-for-C.
MarkE, can you give an explanation for this? It's over my head theoretically.

MarkE

#16713
October 27, 2014, 06:45:47 AM
Quote from: TinselKoala on October 27, 2014, 05:28:11 AM
I'm curious as to why the Basic JT circuit, with 1:1 inductor ratio, will work with (some) reversed transistors. The NPN circuit will work with, eg, BC337-25 reversed E-for-C, and the PNP circuit will work with BC556B reversed E-for-C.
MarkE, can you give an explanation for this? It's over my head theoretically.
There are so many JT variants out there I need to ask for a sketch.

TinselKoala

#16714
October 27, 2014, 08:51:27 AM
See below.  Straight NPN version shown. For straight PNP version reverse polarities of battery and LED. For "reverse" transistor versions swap C and E connections.
My testbed uses a 13+13 winding on a random toroid, dark grey or black.
PNP: eg. BC556B etc.
NPN: eg. BC337-25 etc.
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