Hi all,

Looking for a way to measure a voltage of 200VDC or a bit more with a=20
PIC circuit.  I don't need the full range all the way to zero -- only=20
about 100V to 200V.  The PIC circuit already has its own power supply,=20
so I only need the circuit to drop the 200V to something under 5V, or=20
some varying resistance perhaps.  And it needs to be cost-effective=20
(under say $5 in 100-pc quantities).

A resistor divider is not doable because the sections are isolated. I=20
did find some special opto-isolators for analog signals, but they're=20
very pricey.  But I understand that some common (ie: typically used for=20
on/off signals) opto-isolators can work for linear signals.  Anyone here=20
know if this is true, or have another way to do this?

Cheers,
-Neil.

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