Am 26.05.2017 23:21, schrieb Graham:
The H bridge seems a interesting design, one point , the amp is
on frequency , F in = F out ?
Yes, there is no divider stage in this design.
As far as i know the ones which are cheap and available in small amounts
are not suitable for 137 kHz and such power levels.
Composite driver IC's are available for the H configuration,
Have you looked at these ? ?,
would seem to simplify construction , to a single out put
transformer , whilst producing less harmonic power ... ?
A single housing will concentrate the dissipated power on one spot which
is a disadvantage. I prefer the normal TO-247 components...