Mark Scoville escreveu:
> Thanks again to everyone that made suggestions on how to generate 50Hz AC.
>
> Here is what I ended up doing.
>
> We had a APC UPS in our lab gathering dust - it has a small lead acid
> battery and puts out 115Vac at 60Hz when the AC fails. We opened it up and
> found that it has a PIC16C745 with a 6Mhz crystal. I changed the crystal =
to
> 4.915Mhz (Don't have any 5Mhz) and now it puts out 115Vac at 49.15Hz (Clo=
se
> enough to 50Hz for me). So, we intend to replace the APC UPS battery with
> our large 12Vdc lab power supply and use the UPS ac output at 49Hz to pow=
er
> the device we want to test.
>
> This is undoubtedly not as good as a Behlman power source or some of the
> other true sinewave solutions, but it is probably good enough for what we
> intend to do.
>
> -- Mark
>   =


Can't you add a low pass filter (big inductor) at output? It will remove
some high-frequency harmonics and make the wave more sinusoidal.

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