RE: sstc driver enclosure

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

Original poster: "John Tomacic by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla_ownz_u-at-hotmail-dot-com>

Hi everyone,
On my SSTC driver I use a small rubber booth on the main power toggle 
switch, plastic booths on the small toggles and plastic knobs on the 
potentiometer shafts.  This works fine as long as the controller is at least 
10 feet away from the magnifier coil.  That's one of the advantages of 
building a magnifier as opposed to an air coupled primary/secondary 
arrangement... you can keep the coil far away from yourself and the 
controller.  I still get RF burns from touching the controller chasis, and 
the plexiglass cover sounds like a very good idea.

John Tomacic


>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: RE: sstc driver enclosure
>Date: Wed, 02 Jan 2002 08:02:24 -0700
>
>Original poster: "Lau, Gary by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
><Gary.Lau-at-compaq-dot-com>
>
>While a plastic enclosure or sheet may well be HV puncture-proof, don't
>forget that the potentiometer shaft & knob poking through, the thing you
>tend to hold on to, may not be.  There shouldn't be any kind of switch that
>would shut the TSG off, as it MUST always be on as long as power is applied
>to the NST.
>
>Gary Lau
>MA, USA
>
>
>Original poster: "Justin Hays by way of Terry Fritz <twftesla-at-qwest-dot-net>"
><pyrotrons2000-at-yahoo-dot-com>
>
>Hi James and All.
>
>Using plastic enclosures for SSTC's can be good and bad in a couple
>of ways.
>
>Good reasons for plastic enclosure:
>
>1. Doesn't burn you when you touch it (like, when you turn it off ; )
>2. Looks great as you can see the circuit "guts". (I put a blue and
>red LED in mine once, it looked way cool).
>
>Main bad reason for plastic:
>
>Doesn't shield the circuit inside from RF. If your coil output gets
>back into the electronics (and I don't mean arcing to it!), you'll
>have some major problems. Test the design first, to see if it will
>operate without having to be inside an enclosure. If it does, a
>plastic case will be fine.
>
>If the circuit DOESNT work outside of a metal box, make or buy a
>metal case for it and surround it with plastic (lexan, p-glass,
>etc.)......yes, it will make a capacitor out of the thing, but NO
>you'll not get burned by it. Because there's no way YOU will
>accumulate enough voltage to puncture the plastic and arc to the
>metal behind it. I've tested 1/8" plexiglass sheet with a measured
>25kVDC and it doesn't puncture. And 25kVDC will arc a couple inches
>through air....so you're safe....
>
>Good luck!
>
>Justin Hays
>KC5PNP
>Email: justin-at-hvguy-dot-com
>Website: www.hvguy-dot-com
>
>
>
>


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