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Re: Capacitor Size and BPS



Original poster: FutureT@xxxxxxx In a message dated 12/23/05 2:44:48 PM Eastern Standard Time, tesla@xxxxxxxxxx writes:


I'm trying to get a better understanding of the
appropriate size capacitor for a Pole Pig driven coil.
  Obviously a larger capacitor will give a bigger bang,
but too big will charge too slowly and may not achieve
120 BPS.  As I understand it, 120 BPS is the magic
number, anything lower essentially means charging
cycles are missed and total power transfer is less?
Correct me here if I'm wrong...

So I'm seeking advice on capacitor size for a 5KVA 11"
Coil.  Any advice?

Thanks,

Curt.


Curt,

A lot of what has been written about 120 bps applies to NST powered
coils.  Pig powered coils are more tolerant of different break rates.
You'll want to use a rotary gap with a pig powered coil.  A pig
powered coil can be run at 120 bps but a synchronous rotary spark
gap will be needed, and the capacitor value will be more
critical.  An async rotary works very nicely on a pig
coil and has the advantage of permitting one to change the break rate
during operation to produce interesting changes in sound and
spark appearance.  Break rates from 250 to 400 bps are commonly
used for async coils.  Some folks use a fixed async break rate of
around 180 bps.

John