Re: SSTC newbie

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Sundog by way of Terry Fritz <twftesla-at-qwest-dot-net>" <sundog-at-timeship-dot-net>

Hi Justin, All,

  The ferrite core transformer I have I scavenged from an SMPS.  It's about 
1 3/4" high, 9/16" wide, and 1 5/8" deep.  It's a dual E core with a round 
center post.  The bobbin gives me about 1/4" x 1.5" window.   I already put 
it on the signal generator, and it operates best from 300-500khz, but 
output looks good up to 3mhz (but it'd probably be lossy as heck.)   I 
tried a variety of waveforms into it, and while a square wave gave me some 
funky looking output, it was mostly a sine wave.

   I only intend to run it on 120v, because by the time I move up to 240v 
mains in the garage, I'll be ready to build a more powerful one and I'll 
use a much beefier set of MOFSET's for that.  Just like VTTC's, I want to 
get it running well before I try for a big one.

   I wondered about the core because it's handy, and the bobbin makes it 
real convenient ;)  Many thanks on the info about the gate drive.   I'm 
following Richie's design pretty much, because it's proven to work, and 
work well.   Does this design give me an interruptor, or should I use a 555 
timer's output on the MOFSET driver to put it into sputter mode?

  And a strange question...what the heck is that unearthly squeal and 
where's it coming from??!?! :)

Sundog G5-1203



At 07:34 PM 7/30/2002, you wrote:
>Original poster: "Justin Hays by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
><pyrotrons2000-at-yahoo-dot-com>
>
>Hi Shad,
>
> > For this, the IRF740's should work well.
>
>IRF740's are rated 400V and 10A I believe. If you are just getting
>into power electronics via SSTC's, I suggest starting with parts
>rated at least 500V and 15A or so. IRF740's will work great with a
>good design, however.