Re: SRSG break rate

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Bill Vanyo by way of Terry Fritz <twftesla-at-qwest-dot-net>" <vanyo-at-echoes-dot-net>



Tesla list wrote:
> 
> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<FutureT-at-aol-dot-com>
> 
> In a message dated 6/21/01 8:38:22 PM Eastern Daylight Time, tesla-at-pupman-dot-com
> writes:
> 
> Bill,
> 
> The positive and negative peaks don't cancel because the positive
> peak energy is used up in that gap firing or bang, to produce sparks.

If the gap fires at a positive peak, the next firing will be at a
negative peak.  After the firing at the positive peak (the high point on
the voltage sine wave), the next quarter cycle is positive voltage
(decreasing), and then the next quarter cycle is negative voltage
(increasing).  Then it fires at the next peak.  So if firing is at the
peaks of the voltage sine wave, between any two firings the transformer
delivers equal positive and negative voltage, which would seem to have a
net effect of doing nothing.

Again, I'm new at this, and as someone else attempted to clarify, there
are other things going on here.  I'm completely ignoring the primary
coil as a component (because I'm not sure exactly how it comes into play
with regard to the question at hand - cap charging).

Before I start building a SRSG, I'd like to have some confidence that
I'll be able to phase it properly without frying my beloved NST's in the
process.  Maybe I should just stick with the static gap.  My coil is not
up to where it should be though (three 15/60 NST's, 0.06uf cap, 1000
turn 6.5" secondary, etc... producing approx 3 to 3.5 foot purple
streamers), and I thought a SRSG might help.  I'm pretty confident about
my tap points for the various toroids I've run with.  I've tried all
conceivable combinations of adjusting the tap point, toroid size, static
gap spacing and primary-secondary coupling, and can't seem to get it
past 3.5 foot streamers.

	- Bill Vanyo


> Now the
> energy is gone, and the cap is charged up again from the negative
> peak, and then the gap fires, and the energy is used up again.
> >From the point of view of the cap, it may as well be charged with
> DC, and it can be considered that way.  Each firing is a separate
> event.  If the gap firing was delayed so that the cap was discharged
> and recharged to the other polarity before the gap fired, then what
> you're saying would be true, but a coil doesn't work that way.
> The gap must fire when the cap is fully or mostly fully charged
> to a peak voltage.
> 
> I usually just phase up my sync gaps at low power using a variac,
> then raise the power level gradual, rephasing along the way.  Some
> sort of mechanical or electrical phase controller is helpful.  My
> electrical phase shifter circuit can be seen at my website.
> 
> John