I found an old artical on my computer and was reading it, what caught my eye was that he was using some pass filters to give his mod sine wave a better look...Does anyone have a circuit or can point me via link in the right direction to a 60hz pass filter of this type? Thanks....
THis is all I have....Don't know where i picked it up from...
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A friend of ours gave us a 1500 Watt inverter that contained Siemens Mosfets (look it up).. these are good transistors and can handle being filtered on the input AND the output. The Inverter had a bad transformer in it, but this was easily replaced. Then I took the Modified Sine wave the inverter produced and rounded off the top and bottom of the wave and smoothed out the inclines using pass filters I made on breadboard. The wave looked good and I seemed to hit an RMS value of .707 (which is all you can expect from the power company). Then I put a computer on the inverter and let it run for 3 days. This computer pings the atomic clock in Boulder Colorado over the internet and automagically adjusts the system clock... I turned off the atomic pinger and let the computer run.. when I pinged the atomic clock again in three days I had lost only 3 seconds!!!! I can live with that, and it means my cycles and wave are pretty darn close to what the power company is giving me... It felt so good to me that I did the same thing to a UPS unit AND a smaller inverter we use for lamps and such
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