Article View: sci.electronics
Article #17211Re: Variable Capacitor, need one
From: carl
Date: Mon, 26 Jan 1987 20:42
Date: Mon, 26 Jan 1987 20:42
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1369 bytes
In article <3201@ece-csc.UUCP> kwf@ece-csc.UUCP (Kenneth W. Fernald) writes: >I'm looking for a panel-mount, variable capacitor for a project I'm >working on here at home. The maximum value needs to be somewhere around >50 pF of so. Trimmers won't work because I need to put a knob on it. > >At first I tried using a standard 365 pF tuner capacitor and removing some >of the plates to reduce the capacitance, but it was rather unstable. > Have you considered putting 60 pF or so in series with your standard 365 pF capacitor? Then you will go from a minimum capacitance of about 30 to a maximum of 50 pF as the variable is tuned. Oh for the junk box of my youth!! By the way, is the instability mechanical, or is neither side of the variable cap. grounded so you have also electrical instabilities? Maybe a circuit redesign could help too.
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!cbatt!ucbvax!sdcsvax!carl From: carl@sdcsvax.UUCP Newsgroups: sci.electronics Subject: Re: Variable Capacitor, need one Message-ID: <2603@sdcsvax.UCSD.EDU> Date: Mon, 26-Jan-87 15:42:20 EST Article-I.D.: sdcsvax.2603 Posted: Mon Jan 26 15:42:20 1987 Date-Received: Tue, 27-Jan-87 05:45:42 EST References: <3201@ece-csc.UUCP> Reply-To: carl@sdcsvax.UCSD.EDU (Carl Lowenstein) Organization: U.C. San Diego Lines: 14