A Variable Question.

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

Original poster: "Ken Stevens by way of Terry Fritz <twftesla-at-qwest-dot-net>" <bluewaterdiver-at-earthlink-dot-net>

I was musing over the cost of a descent variac. 

Anything worth while on E-Bay costs a small fortune to ship, and my
local surplus store wants gold for even a tiny trashed unit.

While I was crying in my milk, I cleaned out some boxes and found my
stash of 150A Power HexFET's. I have several of these monsters that I
used as R/C switches in my Battlebots endeavors.

My question is does anyone have plans for or know of them for a FET
based variable AC power supply? Basically an electronic variac!

With 2 or 3 of these things in parallel you could conceivably create a
200A "variac".

Any info on something like this hiding out there??

As always, thanks,

Ken Stevens

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com] 
Sent: Saturday, October 05, 2002 8:22 PM
To: tesla-at-pupman-dot-com
Subject: MOT Voltage Doubler--Again!

Original poster: "Gregory Hunter by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <ghunter31014-at-yahoo-dot-com>

Dear List,

I've gotten over my ill-tempered tiff with silicon,
and rebuilt the twin MOT power supply with voltage
doublers. I figured if some coilers can build an
entire system from nothing but FETs and PWMs, then
surely I can employ a simple rectifier string without
blowing it. I don't usually give my coils or major
components silly pet names, so I have simply dubbed
this PSU the "Mark III", since it is my third
iteration of the MOT doubler scheme. Have a gander at:

http://hot-streamer-dot-com/greg/Mark III.htm

Cheers,

=====
Gregory R. Hunter

http://hot-streamer-dot-com/greg