[HomeBrew] Inverters

[Andrew Roos]

Hi Jim

You need a low-pass filter with a cutoff frequency of about the output
frequency of the inverter (50 or 60HZ, not sure which you guys use). A
square wave contains the fundamental frequency plus all odd-order harmonics
(3rd, 5th, 7th etc). If you filter out the harmonics, you will be left with
the fundametal frequency (a sine wave). I magine that a C-L-C pi section
(shunt C, series L, shunt C) should be quite adequate.

73
Andrew ZS1AN

-----Original Message-----
From: homebrew-bounces at mailman.qth.net
[mailto:homebrew-bounces at mailman.qth.net]On Behalf Of Jim Miller
Sent: 06 December 2005 07:47
To: HomeBrew at mailman.qth.net
Subject: [HomeBrew] Inverters


** Please do NOT cross-post messages when posting to HOMEBREW **

Does anyone know how to smooth the stepped square wave coming out of these
cheap inverters to something more like a sine wave?  Transformer?  LC
network?

It blew up my little color TV at my station. After that I put the scope on
it and found it was a two step inverter.  It SAID is was good for TV,
appliances, etc up to 1200 W.  Bull.

TIA, de Jim KG0KP
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