Re: Sam Barros' Latest experiments:-)
The National type 7703 will hold off 20 kV (most up to 25 kV) and work as
great ignitors for a cap discharge. We use a 20 kV 50 MFD cap with them to
blow up wires 10-12 feet long. Trigger with a 2 MFD cap charged to 2.5 kV
Another, less expensive, way to discharge your cap --- use a solenoid to
move a ground ball approx 2 inches to make contact with the lower end of
the charged wire. Be sure to use a relay to disconnect charging power
supply first so you don't blow your diodes.
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: Sam Barros' Latest experiments:-)
> Date: Thursday, January 14, 1999 5:54 PM
> Original Poster: "danial stocks" <diode-at-hotmail-dot-com>
> Hi folks...
> I was mucking around with hotwire explosions etc a few years ago, and
> one of the best things for this instead of a spark gap is an ignitron.
> They are not perhaps too good for coil use as they are a bit slow to
> ionize, but even a smallone can hold off lots of kv ( someone was
> telling me that if you encased the entire top of one where the anode
> lead comes out you could get it to hold 20kv!) and they will just sit
> there until you trigger them - at which point you can get pulses of
> 10000 - 15000amps! to flow if your caps are suitably rated. This pulse
> current rating will not do any damage to the tube. I was triggering them
> with a 0.5uf cap charged to about 800 - 1000v thru a 2 ohm resistor .
> The cathode of these tubes are mercury and the whole thing is sealed in
> vacuum , so they will only really suffer damage electronically if you
> damage the ignitor or melt the anode with very long high current pulses
> ( 10's of ms). The bonus of these tubes over a spark gap is that the
> discharge happens on cue - rather than when breakover point is reached
> at some stage, and the voltage drop is less - so more energy can be
> devoted to blowing something up...
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> >Subject: Sam Barros' Latest experiments:-)
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> >Original Poster: Sam Barros <sambarros-at-yahoo-dot-com>=20
> >Greetings Fellow Coilers!
> > Yep, it's me again... You probably remember my latest posting about a
> >High-Power Double Car Ignition Coil Driver which used two coils in
> >anti-parallel and could create arcs up to 10cm in length. I didn't
> >receive a whole lot of response on it and some of the few responses I
> >got were from people doubting the fact that it was outputting 1.1kW
> >and whereabouts. Hopefully that is cleared out now.
> > Well, I =93teamed up=94 with another soon-to-become Coiler called
> >Reinars. He's on the list, but, like 95% of all users he seems to be
> > Sam Barros,
> > "The Less You Know, The Better You Sleep"...
> > "Evolution Stops When Stupidity Is No Longer Fatal"
> > "If At First You Don't Suceed, Increase The Amperage"
> >DO YOU YAHOO!?
> >Get your free -at-yahoo-dot-com address at http://mail.yahoo-dot-com
> Get Your Private, Free Email at http://www.hotmail-dot-com