Re: PIRANHA-III Trigger Circuit (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Gerry Reynolds <greynolds@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Thu, 21 Dec 2006 16:39:44 -0700
From: Terrell Fritz <terrellfone@xxxxxxxxxxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: PIRANHA-III Trigger Circuit (fwd)

Hi,

At 07:15 PM 12/20/2006, you wrote:

>From: S&JY <youngsters@xxxxxxxxxxxxxxx>
>Subject: PIRANHA-III Trigger Circuit
>
>Terry & perhaps others,
>
>
>Recently you mentioned you were going to try triggering your SIDAC-IGBT
>stack with an ignition coil.  I came across an interesting and simple
>variable rate trigger circuit for a strobe light which also uses a SIDAC!
>It might work well for your trigger - see
>http://geocities.com/lgtngstk/Strobe/Strobe.html.  Just substitute the
>ignition coil for the trigger transformer.  Of course, eliminate the flash
>tube & R1, and you will probably want to increase C3 to pump more energy
>into the ignition coil and correspondingly decrease R3 and R2 to get the
>break rate range you want.

This is similar to the DF-DRSSTC pulse firing circuit I used on the 
DF-DRSSTC (upper right):

http://hot-streamer.com/temp/DF-DRSSTC-SCHEMATIC.pdf

Your circuit is pretty nice and easy and should work fine ;-))


>Also, an ignition coil without a common
>primary/secondary connection would be safer, or run the trigger from an
>isolation transformer.

I was going to use two ignition coils for total isolation since everything 
in the primary circuit is very hot!

Cheers,

         Terry



>Merry Christmas,
>--Steve Young