Re: Variable capacitor

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Black Moon by way of Terry Fritz <twftesla-at-qwest-dot-net>" <black_moons-at-hotmail-dot-com>

your going about this wrong.
A: you insert well, anything into the center brine, to raise and lower its 
level (can be conductive, its purely to displace the brine, infact, 
conductive would probley be perfered)
B: you use a cap with brine on both sides, and simpley raise and lower the 
inside container
C: Standard rolled caps, when pressured is applyed will usally change 
capasatance, with a few pounds a 3.5nf cap will become a 4nf cap, depending 
on how well the foil was layed (presumeing tin foil used for plate)




>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: Variable capacitor
>Date: Mon, 28 Oct 2002 00:02:13 -0700
>
>Original poster: "Harold Weiss by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
><hweiss-at-new.rr-dot-com>
>
>Hello all,
>I have built a Cu/PVC tubing variable cap somewhat similar to what you
>describe.  It did not work!  PVC has too low a puncture voltage.  My 6/30 
>NST
>could breakdown the 3/4" PVC tubing dielectric.  You need to go with 
>Acyrlic or
>polyethelene in oil.  The cap I made used a 3/4" Cu patching pipe over 3/4" 
>PVC
>pipe.  The repair pipe was 12" long.  For the other plate, I used 1/2" Cu
>pipe.  I measured this for capacitance, and was able to get 100pF.  This 
>cap
>failed as soon as I applied power.
>
>Thanks for bringing this idea back up!  Now that I am older and wiser about
>materials, I can bring this cap to life. ( Isolated servo system.  Hmm.. 
>where
>did I put those motors?...........)
>
>David E Weiss