[Milsurplus] Inverter idea

[Dick]

Marty and gang:

A word of caution.  Don't feed the output of a synthesizer type inverter 
into a spike filter.  The filter sees the rise and fall times of the 
synth'ed waveform as a spike and clamps it so that the filter appears as a 
short to the inverter output.  You get the same warning with a UPS backup.

Happy inverting,

Dick

----- Original Message ----- 
From: "Marty Reynolds" <cosmoline at ba-watch.org>
To: "Jack Antonio" <scr287 at sbcglobal.net>
Cc: <milsurplus at mailman.qth.net>
Sent: 11 May, 2005 10:07
Subject: Re: [Milsurplus] Inverter idea


> .
>>
>> Has anyone tried to see if these inverters can be
>> altered to make 400 cycles instead of 60?
>>
>> Jack
>
> OK, I just looked into a 175W GE.  3 16-pin dip ICs, one
> 20 pin.  Lotsa glue pieces.
>
> This was 2nd visit, 1st being a year back.  Again I felt
> like the nude in the sculpture looking @ the skull saying
> "Alas poor Yorrick."
>
> These modern inverters are some kinda neat.  They're PWM
> to deliver 115VAC rms independent of load.  Waveform is
> series of steps that approximate a sine.  Each step made
> of lots little PWM interior spikes.  And they're always
> delivering ~300V p-p.
>
> If you find the answer Jack, call - don't write!
>
> Makes you wonder how they come to market so cheap
>
> Time flies like an arrow
>
> Fruit flies like a bananna
>
>   Groucho