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Re: Spark Gap Replacements



Tesla List wrote:
> 
> Subscriber: jim.fosse-at-bdt-dot-com Thu Jan  2 23:18:47 1997
> Date: Fri, 03 Jan 1997 05:15:35 GMT
> 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
> >your work, did you see any surprises, or did experiment seem to match
> >theory?
> >
> 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.
> 
> ( I'm not sure about IGBTs, but, I'd bet that they have a reverse
> diode in their construction;(
> 
>         Regards,
> 
>         jim
> 
> abysmal sentence construction! I hope it's understandable in american
> instead of the engineerese that it was written in;)

Jim,

Thanks! Seems I remember that this configuration had low voltage
withstand capability (but made for excellent DC restorer circuits). Its
been a while...

-- Bert --