RM> The only ways I can see of faking a 240V sinewave are (a) synth
 RM> it with fast pwm, as above, (b) do a squarewave and filter it
 RM> at hi power with caps and big fat heavy expensive inductors,
 RM> (c) synth it as in (a) and filter the output as in (b), and (d)
 RM> drive the transformer with a linear amp, and waste a bit of the
 RM> 240 output to drive its cooling fans.

  The usual solution is to synthesise it (but balanced push-pull) with
a simpler low-Q filter than you need for (b). As I said once before, I
like the linear amp approach for low power.

Regards,
Bob
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