>     in the milliamps range. Can anyone suggest a good AC to DC conversion
>     circuit, preferably without a transformer?
>
Sorry ? Could you plese explain what for (Input/Output parameters) ? At
least I didn't understand the connection of that problem with a DC motor
control (unless it's related to getting the 90 Volts DC from a 115/230 V AC
net).

>     Second, can anyone suggest a proper interface circuit that will allow
>     the PIC to perform PWM. In other words, perhaps control of a MOSFET
>     that does the switching with proper protection for the PIC.

If you want to do breaking, you'll need some possibility of electronically
short-circuiting the motor. With a full bridge it's easy, but that requires
4 power transistor vs. 1 for a simple speed control.

For the power part: at that current/voltage I'd use a bipolar transistor.
High voltage mosfets tend to be more difficult to organize. Anyway, the
power part of this circuit (without breaking) could be: optocoupler for PIC
protection, pull-up resistor and a pnp (perhaps darlington) between motor
and positive supply. Should work, but try it beforehand.

>
>     Any assistance would be eagerly and gratefully received. BTW, I have
>     the capability to handle attached graphics files if anyone wants to
>     include a schematic. :)

If you need one, drop me a line - I don't think we should handle schematics
on the list, but in case I talk complete gibberish, the other people here
are bound to provide some corrective feedback.

Bye
  Markus