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Re: Bypass Caps



On Thu, 21 Mar 1996 tesla-at-grendel.objinc-dot-com wrote:

> >From jim.fosse-at-bdt-dot-com Thu Mar 21 01:18 MST 1996
> >Received: from bdt.bdt-dot-com (root-at-bdt-dot-com [140.174.173.10]) by uucp-1.csn-dot-net (8.6.12/8.6.12) with SMTP id VAA16874 for <tesla-at-grendel.objinc-dot-com>; Wed, 20 Mar 1996 21:06:26 -0700
> From: jim.fosse-at-bdt-dot-com (Jim Fosse)
> To: tesla-at-grendel.objinc-dot-com
> Subject: Re: Bypass Caps
> Date: Thu, 21 Mar 1996 04:03:21 GMT
> 
> tesla-at-grendel.objinc-dot-com On Wed, 20 Mar 1996 13:31:17 +0700, you
> wrote:
> 
> 
> >Re: Damping resistors with transformer protection filters
> >Jim:
> >	I have been running some (approximate) simulations here
> >which lead me to the same conclusion - use resistors in series
> >with the RF choke, as large as you can stand and still keep
> >the power dissipation under control.  Your 2.25 k per leg sounds
> >good, and 5 k would be better but burn up a lot of power (no
> >problem except the resistors would get pretty hot, depending
> >on rating).
> >Ed Phillips
> >
> >
> Ed,
> 	When I started seeing 80KV on the neon during simulations, I
> went oh-oh. Then Malcolm mentioned using a series resistor and I went
> AH-AH. It's a resonant circuit, dampen it. It's been so long since
> I've built any RF circuitry that I've almost forgotten the real world
> basics.
> 
> Since I've added the resistors, I'm down to very few flash overs on my
> safety gaps. Right now I think they are a good compromise between
> power and neon life.
> 
> 	thanks for the confirmation,
> 
> 	jim
> 
> 
> 
The inductive kick you see using spice is due to the Vsin supply turning 
ON and changing from 0V to 15KVAC in a fraction of a second.  change the 
parameters and increase the turn-on time of the supply (Actually what you 
should do is simulate the effect of slowly increasing the voltage. As if 
you were using a variac.)

Matthew J. Klueppel       Software Engineer,System Administrator
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