Re: Spark Gap Replacements

• To: tesla-at-pupman-dot-com
• Subject: Re: Spark Gap Replacements
• From: FutureT-at-aol-dot-com
• Date: Sat, 4 Jan 1997 14:52:19 -0500
• Subscriber: FutureT-at-aol-dot-com Sat Jan 4 21:50:23 1997

In a message dated 97-01-04 01:31:47 EST, you write:

<<  From: Jim Fosse <jim.fosse-at-bdt-dot-com>
 > To: tesla-at-pupman-dot-com
 > Subject: Re: Spark Gap Replacements
 > 
 > >Date: Wed, 01 Jan 1997 10:06:26 -0800
 > >From: Bert Hickman <bert.hickman-at-aquila-dot-com>
 > >To: tesla-at-pupman-dot-com
 > >Subject: Re: Spark Gap Replacements
 > >
 > [snipletto for chip, et. al.]
 > >
 > >Thanks for the update! This is an area I'd like to further explore when
 > >time permits, though probably with power MOSFETS or IGBT's instead of
 > >straight bipolars, for the same reason - investigating quenching. In
 > >snip>
 > John and Bert,
 > 
 >         Don't forget that a reversed biased transistor ( Collector
 > Emitter reversal; not base reversal), unlike a tube (cathode emission
 > problem) or mosfet (reverse diode conduction on problem), exhibits a
 > gain of about 0.8! with a very low drop of (say) 20 millivolts.
 >       
 >>         jim
 > snip
 > Jim,
 
> Thanks! Seems I remember that this configuration had low voltage
 >withstand capability (but made for excellent DC restorer circuits). 
 >snip
 >-- Bert --
  >>

  Bert,   Jim,

The transistor I used (TV  horizontal output type), has a built-in damper
diode; probably protecting the transistor?

John Freau

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