RE: military transformers

To: tesla-at-poodle.pupman-dot-com, tesla-at-poodle.pupman-dot-com, tesla-at-poodle.pupman-dot-com, tesla-at-poodle.pupman-dot-com
Subject: RE: military transformers
From: Tesla List <tesla-at-stic-dot-net>
Date: Sat, 03 May 1997 01:59:11 -0500
Approved: tesla-at-stic-dot-net

Subject:  RE: military transformers
  Date:   Fri, 2 May 97 06:15:30 UT
  From:  "William Noble" <William_B_Noble-at-msn-dot-com>
    To:  "Tesla List" <tesla-at-pupman-dot-com>

if you really want 400 hz, just build yourself an inverter - it's a
simple 
circuit if you don't feel a great urge to include power factor
correction - 
use a full wave bridge and some capacitors to make your 110 or 220 AC
into DC, 
then us a push/pull (or just a pair of transistors if you have a center
tap on 
the transformer primary) circuit to drive the transformer.  you can let
it 
self oscillate at whatever freqnency it wants to - it will settle out
near 400 
hz typically (e.g. more than 200 and less than 1000) - at least that's
been my 
experience - but I have usually been back driving them to make 6VDC into
220 
AC.  I can scan a schematic for an electronic ignition I built years ago
that 
has such an inverter based on a 400 hz aircraft type power transformer,
but 
it's really pretty obvious.

For higher power work you can probably use an SCR with a suitable
snubber, but 
I have found transistors easier to work with.  A typical TV horiz drive 
transistor will easily handle the power levels - they can switch 3 or 4
amps 
at 700V or more.

-----Original Message-----
From:   Tesla List 
Sent:   Wednesday, April 30, 1997 9:41 PM
To:     tesla-at-poodle.pupman-dot-com
Subject:        Re: military transformers

Subject:  Re: military transformers
  Date:   Wed, 30 Apr 1997 08:36:05 -0500
  From:   David Huffman <huffman-at-FNAL.GOV>
    To:   Tesla List <tesla-at-pupman-dot-com>

Wouldn't it be nice to have 400Hz or higher to play with! Recharge those
caps every couple of milliseconds instead of every 16ms.
DLH

[Bill]  snip