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Re: military transformers

Subject:  Re: military transformers
  Date:   Mon, 05 May 1997 09:35:53 -0500
  From:  David Huffman <huffman-at-FNAL.GOV>
    To:  Tesla List <tesla-at-pupman-dot-com>


Hi,
The only problem here is that electronics and TCing are a hard
combination
to get working together. I'm thinking of 1KW minimum, 5KW would be hard
to
do with transistors/SCRs especially with my budget.  Years ago my
college
room mates and I bought a 3 phase 400Hz dynamotor surplused from some
aircraft. That would be a forgiving unit to use with a coil.
I'll have to get my buddy a call and see if he still has the unit.
Dave Huffman

----------
> From: Tesla List <tesla-at-pupman-dot-com>
> 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
> Date: Saturday, May 03, 1997 1:59 AM
> 
> 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
>