RE: SCR spark gap results are in!

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Steve Conner" <steve.conner@xxxxxxxxxxx>

>i am now working on a single transistor spark
>gap replacement.

*ahem* done that :P Mine uses an IGBT though (actually two 600A, 1200V IGBTs
in parallel, but would work with a single device) It uses a single turn
primary with a voltage of 1000v and over 5000A of peak current. I don't
think it would work so well with a BJT/darlington type thing. They have
serious trouble trying to pass more than twice their rated current,as the
current gain falls off terribly at high currents.

The record for my IGBT coil is 73" at 3kW.

http://www.scopeboy.com/tesla/t4proposal.html the complete story of how it
was made
http://www.scopeboy.com/tesla/oltc2_6foot1.jpg a picture of it doing 73"

It's not nearly as efficient (in terms of spark length per watt) as a good
spark gap coil but it still produces more sparks than I know what to do
with!

To get the very best performance it seems you need to make a "DRSSTC" using
a H-bridge of four large IGBTs.

Steve C.