From: Mark Fergerson
Organization: @Home Network Member
X-Mailer: Mozilla 4.61 [en]C-AtHome0407 (Win98; U)
Subject: Re: Spark gap q
Date: Fri, 15 Nov 2002 19:32:10 GMT
NNTP-Posting-Date: Fri, 15 Nov 2002 14:32:10 EST
"N. Thornton" wrote:
> email@example.com (John Crighton) wrote in message news:<firstname.lastname@example.org>...
> > On 12 Nov 2002 10:07:43 -0800, email@example.com (N. Thornton) wrote:
> Thanks for the replies.
> > Is there any combination of material / curent etc that produces a
> > fixed spacing spark gap that doesn't burn at all, i.e. would be very
> > long lasting?
> I am thinking in terms of miniature spark gaps, run at very small
> currents, more signal than power.
> > Spark gap design is still something of
> >an art. What voltage, current, rep rate, etc?
> V very low, very narrow gap. Below 20v.
You want the arc to start at 20V, or
to drop 20V once started (you say you've
worked with carbon arcs so you ought to
know they're negative-resistance
phenomena)? I agree with others that
starting an air arc at 20V is gonna be,
> Current ditto, far below an amp.
> Rep. rate 100Hz. faster rep rates would be attempted later, but aren't
> a necessity.
I think somebody mentioned a Diac or
similar semiconductor as a better
solution. Looked into other
negative-resistance ideas, like
Negistors or Lambda diodes?
> Its difficult to be more precise at this point.
We ought to have asked earlier; why
are you trying to build such a
low-voltage gap? What's it for?
Mark L. Fergerson