Re: Variable capacitor

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Original poster: "Jolyon Vater Cox by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jolyon-at-vatercox.freeserve.co.uk>

Christopher,
Ffor the non-conductive displacer, how about using an inflatable air-filled
balloon; for more capacitance inflate the balloon to displace more liquid
for less, deflate the balloon.
A small compressor -possibly a tyre pump- and an air-release valve could be
used to control the pressure.

However  might not "live-tuning" still be a problem with salt-water
capacitors  due to the short-term adherence of the solution to the container
wall increasing the plate size (and hence capacitance) above the desired
value whenever a reduction in capacitance was required?

Jolyon
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, October 25, 2002 12:43 AM
Subject: Variable capacitor


> Original poster: "Christopher \"CajunCoiler\" Mayeux by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <cajuncoiler-at-cox-dot-net>
>
>
> I forget at the moment who it was that last brought up
> the topic of a variable capacitor for "live" tuning, but
> I just had an idea along those lines...
>
> Such a thing might be feasible, if one were using a
> saltwater cap.  Imagine if you will, a standard saltwater
> cap, BUT have a non-conductive object within the brine,
> that can be raised and lowered by a threaded plastic shaft,
> to vary the displacement of the brine (and hence, it's level
> in relation to the outside electrode) , varying the total
> capacitance between it's full possible value, and say HALF.
>
> ... just a thought.
>
>
>
>