shorting coil test 3.wmv

I noticed that in the previous video the very thin air coil do not produce strong flyback spike. So it was difficult to test the Doug Konzen circuit . So i find out from my drawers an old testing machine , in fact a MO fan motor that i cut in 2 parts in order to get a U shape electromagnet which can spin a 6 pole rotor (all the same pole). But this time i use it as a pure generator to see what happens when i short the coil. The inductance of the coil is quite high (1.5 Henry ) due to the core. So i get very interesting results. I hope this is interesting because the spikes seems to occure also at very low speed. good luck at all laurent

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