hello all, you might find this interesting,
Today i managed to get my small 1.75" coil working.
At first, i was getting 3-4" while driving it with a flyback
transformer/555/mosfet(IRF740) driver, then, not happy with
that, i connected this tiny little coil with only 10n tank
capacitance up to a twin mot stack. Thats where things got
loud. It threw white hot streamers straight into the
primary, a distance of about 10" or so (wasn't too worried
about it because i was using a practically indestructable
power supply and an indestructable tank cap).
The funny thing is the breakrate it was running at - 1 BPS
with flyback, FIVE THOUSAND BPS with the mot stack. Now it
may be a terrible waste of power, pumping 2kva into a 1.75"
coil, but, it finally made sparks.
anyways here are the specs:
Power:
unrectified 4kv mot pair, 2Kva
Gap:
5x 1/2" copper couplers
Secondry:
1.75", 6" winding length 900ish turns
Topload:
1.5x5 toroid (foil covered)
Primary:
6" flat spiral, 6.4 turn
10.5n beer bottle/salt water cap
Sparks:
10" loud streamers, 2 or 3 at a time
ben
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