Re: Coil schematics?

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

Original poster: "Malcolm Watts by way of Terry Fritz <twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>

Hello Marc,

On 3 Oct 2001, at 11:42, Tesla list wrote:

> Original poster: "mbarbani by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<mbarbani-at-yahoo-dot-com>
> 
> Hi Terry, Gary,
> 
> Thanks for the tips!!  My thoughts were that if the PFC cap is connected
> directly across the NST, it would likely be having to keep charging up with
> every poewer-up of the coil.  It no doubt would be OK like that but I would
> think that since the PFC acts as a "holding tank", it remains fully
charged and
> "ready to go" when connected across the mains. I run my coil for only 2-3
> seconds at a time, but you make a good point about the higher currents
> involved.

Nice idea but no cigar. Suppose it is charged to the opposite 
polarity to the mains voltage at switch-on time?  Fact is, you can 
always count on a transient of some sort whenever you power a circuit 
up; any circuit.
 
> As for the placement of the safety gaps, it seems there are a couple
schools of
> thought on that? I've seen them placed directly across the NST output as well
> as after the RC network, across the main gap as I have them.  My thinking is
> that if anything happens to the main gap, i.e. it gets opened too wide or
> somehow gets disconnected, the safety gap is right there to fire off and let
> you know. Is there a standard that needs to be set here or am I just blowing
> smoke?  Thanks for your comments, you guys are great.

See my other post for my comments on safety gaps.

Regards,
malcolm