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Re: Safety gap issues



Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>

At 04:45 PM 11/27/2005, you wrote:
Original poster: "JT Bowles" <jasotb@xxxxxxxxxxx>

YOU SAID:
"A very good equation that works well to find a coils peak output voltage is:

Vt = Vf x SQRT (Cp / (2 x Cs))

Where:

Vt it the peak top voltage
Vf is the spark gap firing voltage
Cp is the primary capacitance
Cs is the effective secondary capacitance
SQRT square root function "

* if i know the distance, can you tell me the sparkgap firing voltage? it is 7.5 to 8 mm, at 30MA. 8000v?
* primary capacitance? you mean just the capacitor? 7.8nF (.0078 uF)
* secondary capacitance, with toroid, is 18.6 pF (.0000186 uF)

wtf? that means my coil only makes 117.3KV!!!!?   Cant be true. I wont buy it


8mm * 3 kV/mm for an ideal gap is 24kV.. probably more like 12-15 kV for yours..

18.5 pF is secondary self C + topload?

117.3kV is perfectly reasonable...
why complain?