> -----Original Message-----
> From: Roman Black [SMTP:fastvid@EZY.NET.AU]
> Sent: Friday, November 29, 2002 12:54 PM
> To:   PICLIST@mitvma.mit.edu
> Subject:      Re: [EE]: Generating an isolated 0-10Vdc voltage
>
> Peter Homann wrote:
> >
> > Hi,
> >
> > 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.
>
>
> The smart solution is to isolate a digital
> signal, not an analogue one. Get the PIC to
> output a digital PWM, through a cheap opto-
> coupler, and then filter to analogue with an
> RC filter at the receiving end. :o)
> -Roman
>
Note that most cheap opto-couplers are horribly slow.  Some devices I used
were hard pushed to get 10KHz through.

Mike

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