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Re: [TCML] Old post, Sync. rotary phase effect

On 9/11/20 4:58 PM, shaun wrote:

How in the world can the cap keep charging higher after peak sine wave and
on the down side of the sine wave, there is only one peak. Peak is at 4.16
ms anything after that is lower voltage. Unless you are saying:

Say my cap is only charged to 70% at peak mains, so what you are saying is,
after peak use roughly another 2 or so ms of time on the other side of the
sine wave to continue charging won't be as high, but higher than 70%.
Don't forget that your charging source (NST) has a big inductance. It's easy to set up situations where you're getting a resonance with the primary cap, and ring up to higher voltages.
Back 10-15 years or so, plenty of people killing NSTs with async gaps that happened to fire at just the wrong time.
This is why we talk about STR (smaller than resonant) and LTR (Larger than resonant) Primary caps - it's resonance with the L of the source, not the TC primary.
The big advantage of LTR is that it's hard to kill it with a rotary gap, no matter the phase (and potentially bigger bangs, from the larger stored energy). The downside is that it's more expensive. 






-----Original Message-----
From: Tesla [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of Yurtle Turtle via
Tesla
Sent: September 11, 2020 4:30 PM
To: 'Tesla Coil Mailing List'
Subject: Re: [TCML] Old post, Sync. rotary phase effect

  Not necessarily. If your current limited NST can't fully charge the cap by
the time your mains hit their peak, the cap can keep charging up to the
point where its "charge" = NST output, which can occur after mains peak.

     On Friday, September 11, 2020, 2:57:22 PM EDT, shaun
<snoggle@xxxxxxxxxxxxxx> wrote:
I adj my sync gap using a scope, when the sine wave is at its peak is when 
my gap is aligned and fires. The peak of the ac sine wave is when I want the
cap to discharge. So I set the gap to fire at precisely peak of the charging
sign wave. I want my tank cap in all cases to fully charge and that is at
the peak of the sign wave. So no matter what size tank cap I have, I want it
fully charged and that will always be at the peak of the sign. If it fired
any other place it would not be full charge. The peak ac don't change.
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