>This is the circuit I'm thinking of using
>
>http://home.clear.net.nz/pages/joecolquitt/FETbridge.html
>
>Not shown is a charge pump (probably MAX232) to get 2 x V+
>

I suspect you are making a rod for your own back ... or one of the many
similar expressions.


Get down to RS and buy an Intersil HIP4080. It has a built in charge pump
for the upper FET's, and all sorts of other goodies. It also has a built in
PWM oscillator section so you need only feed in a DC voltage, but it can be
fed with an externally generated PWM if preferred.

There are all sorts of useful app notes and data sheets on the Intersil web
site on the HIP408x family.

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