Hi Bob



 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.



 BL>   The usual solution is to synthesise it (but balanced push-pull) with

 BL> a simpler low-Q filter than you need for (b).



Gotcha. I'll rewrite the list.



 BL> As I said once before, I

 BL> like the linear amp approach for low power.



Its disadvantages (size, heat, efficiency esp. on batteries)

usually outweigh the sensual beauty of the sine curve...



Cheers



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