> I'm planning to generate a 0-10V analog voltage using the PIC PWM, RC
> filter, and op-amp.
>
> The question is how do I isolate the output voltage. The voltage is to
drive
> a 90V DC motor controller where the controller ground is live.
>
> One solution is to opto-isolate the inputs to the PIC and have the whole
> circuit live. I would have to power the PIC circuit via a 12V zener and
> resistor.
>
> The other option is to isolate the 10V signal via a transformer. Does
anyone
> have experience with this or other alternatives?

Why not use an opto-isolator on the PWM output signal from the PIC, then use
it to generate the analog voltage on the other side of the isolator?


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