> > I am asking if anyone can help me in understanding how to create a circuit
> that will vary the voltage to the A/C converter on a Pic chip based on
> varying capacitance due to a hand or body part near a piece of metal.
>
> My idea is to create a Theremin or some sort of proximity detector.

There is a small startup that is producing a sensor based on this. A kit
contains 4 sensors + 1 control module.

http://www.thereminvision.com/

I warn you, the website is absolutely horrible.

The kits are sold at
   http://www.robotlandinc.com/tvision.htm

The price of the complete kit is $50.
--
D. Jay Newman           !
jay@sprucegrove.com     ! Xander: Giles, don't make cave-slayer unhappy.
http://enerd.ws/robots/ !

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