I have been testing some 8 filar 23awg bobbins with iron cores.
Using some very basic methods and a prime mover I achieved the following results. Running 4 of these coils in parallel I can peak the BUS at 120VDC.
Ive been running 120 Led's while losing 20RPM but also using less current on the prime mover with a better secondary recharge rate.
I have been adjusting and tinkering with these coils and currently peaking at .6w per coil.
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I have also tested an 8 filar 18awg with 2"x1"x4" laminated core.
I've only been able to get 5V out of this.