🚀 go-pugleaf

In article <19481@well.sf.ca.us> nagle@well.sf.ca.us (John Nagle) writes:
>Remember to use an enclosed variable capacitor with a grounded, conductive
>case, so that the readings aren't affected by nearby moving conductive
>objects.
>					John Nagle

John, I've got a couple of noisy var caps in my antenna tuner I would like to 
introduce you to ;-).   The mechanical coupling to the variable element
seems to have worn, resulting in noise when the shaft is rotated.

Anyways, using capacitance to close the loop seems a reasonable solution.  
Check out the July 1990 Issue of Sky & Telescope for an application that 
uses a differential capacitative measurement to control the mirror in the
Keck telescope.  Neat idea!

					Rick Spanbauer