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Registered Member #639
Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512
It all depends on the geometry and peak currents in a coil. With a very long length of thin wire the resistance of the wire itself starts to limit the output of the coil. So it all depends on coil geometry and the wire thickness. As far as I know there isn't an exact calculation for this at this time. Usually going by feel works out well enough
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Because 899 is too little and 1001 is too much!
I've always recommended using as many turns as you can, with the finest wire you can handle, for small SSTCs. It lowers the resonant frequency and makes the whole thing more noob-friendly.
My old OLTC2 coil had 1700 turns, but that was probably a little too much. Why? In simple terms: A transformer that steps voltage up must also step current down. If you use too many turns, the output voltage will be very high, but the current will be too low to feed big sparks.
Steve Ward's big DRSSTCs had a lot of turns, one had 2300, and he could get sparks over 10 feet from them.
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Secondary winding turns
