[Milsurplus] 400 Hz Static Inverter

[Paul Kraemer]

That really was many years ago!
PWM, and microprocessors---that is the way it is for past several decades
Paul K0UYA
----- Original Message ----- 
From: "KD7JYK DM09" <kd7jyk at earthlink.net>
To: "Paul Kraemer" <elespe at lisco.com>; "Francesco Ledda" <frledda at att.net>; 
<jfor at quikus.com>
Cc: <milsurplus at mailman.qth.net>
Sent: Sunday, April 29, 2012 9:36 PM
Subject: Re: [Milsurplus] 400 Hz Static Inverter


>I played with some inverters many years ago.  They were all nearly
> identical, an
> oscillator with a pair of resistor/capacitors to control frequency.  No
> schematics, but easy to figure out by looking at them.  Changing the two
> capacitors on the oscillator was all it took to increase the frequency 
> from
> 60 Hz to 400 Hz.
>
> Somewhere around here is the one I modified, a few others I played with 
> and
> print-out of the description of how to do this.  I last saw it when we 
> moved
> about eleven years ago, so it may never be seen again.
>
> Kurt
>