From: "Tesla list" <tesla@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: LTR cap BPS?
Date: Tue, 30 Nov 2004 07:59:33 -0700
Original poster: "Bunny Killer" <bunikllr@xxxxxxxxxxxxx>
Hey Jamie...
when using an LTR cap and NST the spark gap is the item that sets the
majority of the break rate...
the cap will fill to the highest voltage the NST can provide during the
time it takes to make a complete sine wave ( well it will be a tad less
due to resistances) if your spark gap ( lets say its a static gap) is set
to fire at some voltage due to its gap width, the so called break rate (
in theory ) should be 120 BPS ... this is considering that the gap width
is set for maximum voltage of your NST ( which is pretty much impossible
to set without dedicated measuring equipment) if you set the gap too
wide the voltage will and can build to better than 2 times its rated
voltage ( and by the way the voltage ratings you see on the NST are
RMS ratings... this is sort of an average rating of the sine wave, not
the peak ratings the transformer is capable of... a good reason to get
your caps voltage value at 2 times the name plate rating)
if the gap width is set smaller, allowing the spark to be created in the
gap before the sine wave peaks, it is possible to have 240+ BPS...
what happens in this situation is that the voltage builds and then jumps
the gap ( lets say at 50% of max NST voltage) the resonate circuit will
keep the voltage up a bit allowing the NST to recharge the cap set quickly
and POP another spark jumps the gap before the sine wave peaks... this
can happen several times before the peak of the sine wave.... thus 200+ BPS
so in a nut shell the BPS should be 120 and resonate action will
cause it to go higher...
why 120? a complete sine wave has both a "positive" voltage swing and a
"negative" voltage swing.. thus 2 swings per complete cycle ( and
there are 60 complete cycles per second in general USA applications
since the cap is capable of being charged in both directions ( an AC cap)
it is quite capable of the 120 BPS rate
hope this helped..
Scot D
Tesla list wrote:
Original poster: "Black Moon" <black_moons@xxxxxxxxxxx>
Hi, I was wondering, when using a LTR cap an a NST, is your break rate
spost to be around 60? is the resonant action what causes it not to be 120+?