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Author Topic: Bedini SSG Charger applied to Joule Theif  (Read 12360 times)

Offline d3x0r

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Bedini SSG Charger applied to Joule Theif
« on: February 14, 2012, 03:36:27 AM »
I'll try to describe this in words....
I have these Joule theives that I have been playing with; I wound 1, and it worked, I wound another and it worked, so now I'm way down the way :)  But, off the the collector I have wired in the battery collector of a bedini motor, since the spike I see looks a lot the same, actually much sharper instead of milliseconds, microseconds.... And I put in a battery that was dead, and it was a nice resistance, and the charge slowly increased.  The battery is totally dead, the voltage drained from it quickly; I used instead a few caps so I could capture the voltage, and could charge to like 8.5 from the overdrive return spike to the transistor.  Adding that, however, lengthened the low time of the pulse.  I need another scope, there's at least 4 points I want to see to track the sequence of events, and figure out where the real current draw is. 
So then I got clever and was going to use that higher potential, low amp circuit to drive another joule theif.  This potential is above the positive of the original.  I found that if I tried to scope using the wrong negatives used for the ground, I killed the circuit.  I have a secondary coil on the primary joule thief that drives 31 LEDs in series (that's quite some spike from <1.5V).  When I connect the secondary joule theif, it runs, and oscillates rather well (how can I limit the current the secondary draws from the capacitors? ) ; the LEDs go out, and I can power maybe 8 dimly(?) Maybe I get like no power on the primary's secondary pickup?  When I disconnect the joule theif, the LEDs slowly come up to a brightness (as the caps charge?); I can run a lower frequency joule thief from the back emf, if I can find it.  I think I want the diode to the base instead of to the collector.... which is why I want to know more the seqence of events.