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build a variable capacitor
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July 16th 05, 09:37 PM
Gary S.
Posts: n/a
On Sat, 16 Jul 2005 13:08:18 -0500,
(Jim)
wrote:
i need a variable for a receiving loop antenna. does anyone know how to
determine the area of plates for a given value of cap? for example i
need 365 pf. two half circle plates would be handy, separated by a piece
of plastic or card stock. what surface area for each plate would
approximate that value? does two stator plates with one rotor between
them increase the value if compared to one plate each?
The spacing between the plates is an important factor as well.
You will need to construct it mechanically solid enough that the
spacing does not change much.
The dielectric material properties will have an effect as well,
although smaller.
Happy trails,
Gary (net.yogi.bear)
--
At the 51st percentile of ursine intelligence
Gary D. Schwartz, Needham, MA, USA
Please reply to: garyDOTschwartzATpoboxDOTcom
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