Re: Dip Meter TC Tuner

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

Original poster: "robert & june heidlebaugh by way of Terry Fritz <teslalist-at-qwest-dot-net>" <rheidlebaugh-at-desertgate-dot-com>

Matthew: You are quite correct, this day of age a variable capacitor is hard
to find. A capacitor from an old AM radio is about 600pf and low voltage. I
have used reverce biased rectifiers as voltage controled capacitors for
about 100pf max. The old military 600v+ capacitorts are all but gone.
    Robert  H
-- 


 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > Date: Fri, 03 Jan 2003 23:19:28 -0700
 > To: tesla-at-pupman-dot-com
 > Subject: Re: Dip Meter TC Tuner
 > Resent-From: tesla-at-pupman-dot-com
 > Resent-Date: Fri, 3 Jan 2003 23:20:19 -0700
 >
 > Original poster: "Matthew Smith by way of Terry Fritz <teslalist-at-qwest-dot-net>"
 > <matt-at-kbc-dot-net.au>
 >
 > Hi Steve/All
 >
 >> Might have to cannibalize one out of a cheap AM radio.  If you know of
 >> sources, please post it or email me directly - they are becoming scarce
 >> items.
 >
 > Can't speak for anywhere but Australia, but I have seen ex-military
 > variable caps on Yahoo auctions over here.  But you're right, neither
 > Farnell nor RS have them listed (I haven't tracked down a Digikey Australia
 > yet).
 >
 > Old wireless sets should be plentiful in junk shops, so that may be the
 > answer.
 >
 > This does raise the question: how do people build radios now if you can't
 > get variable capacitors? (Apart from trimmers.)  I'm sure that they don't
 > use variable inductors and I didn't think that RC oscillators were suitable
 > for high frequencies; forgive me for being out of date...
 >
 > Cheers
 >
 > M
 >
 > --
 > Matthew Smith            | Business: http://www.kbc-dot-net.au
 > IT Consultant            | PGP Key:  http://gpg.mss.cx
 > Kadina, South Australia  | * Tivis Project * Community Connect *
 >
 >
 >
 >
 >