Quote from: eldarion on July 03, 2007, 04:35:30 PM
Well, I wrapped a coil around the outside of the TPU but wasn't able to couple much energy at all, regardless of frequency.

I am wondering if your original idea was correct; if I were to put some Schottkey diodes across the control coils in order to cause a magnetic spike on back-EMF that will couple into the next coil, etc.  The electric spike doesn't seem to do much good, at least as far as I can see.

More experiments to come...

Eldarion

Thanks for your feedback. I found diodes across a coil reduce the BEMF. I tried for while without any diodes - max BEMF but obviously max chance of burning things out! Try applying a DC current from a separate 12V battery to your output coil and scoping the output coil for anything unusual.

Refer to this circuit to see how to utilise BEMF as pulses into control coils.

http://www.overunity.com/index.php/topic,2697.0.html

Bob,

Thanks for the info; I will order some fast reverse recovery time diodes and try those on the TPU.

That would explain my burnt-up 1N4007s...

Eldarion