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> Have you tried running it from mains?

Oh yeah, it works OK

> I suppose the thing I *should* have asked is what it came out of!

Bought cheaply as a new new part, place in town was having a clear
out. But I have quite a few old appliances (taken from the side of the
road during inorganic collections) that have these motors in such as
fans and microwaves. If I can sort out a controller for them they'd be
ideal as high-torque robot motors for eg lifting arms, particularly those
with gearboxes. Which is why I wanted to know if they're bi-directional.
I've tried making this one go backwards but it won't. Modifying the gear
box doesn't appeal (not impossible) and it would be much simpler if
it could be done electrically at the motor. Reversible synchronous
motors are available but I've yet to see one that has an associated
speed control

> As for protecting the FETs, you are on your own. Again as a TV guy I
> generally will pick something I have lying around, usually a TV horiz
> output transistor good for 1500v, 8amps and has internal diodes and
> resistor protection. Suitable for switching 320vdc into an inductive
> load. :o)

What do you reckon about this attempt at a circuit ? The +ve side looks
OK but I'm not sure about the -ve side, can't find a PNP opto. Because
the o/p transistors have quite low hfe there needs to be both voltage
gain and current gain. It's basically half of an H-bridge (for a non-
reversible motor). I'll have to be very careful that the PIC o/ps are
initialised properly before any mains is present, perhaps hold it off
with a relay

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