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Re: [Amps] Need some 220K 2 watt carbon resistors

To: garyschafer@comcast.net, 'Chris Fox NI4L' <ni4l@charter.net>,amps@contesting.com
Subject: Re: [Amps] Need some 220K 2 watt carbon resistors
From: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Reply-to: g3rzp@g3rzp.wanadoo.co.uk
Date: Mon, 27 Mar 2006 11:05:28 +0200 (CEST)
List-post: <mailto:amps@contesting.com>
Gary said:
>If you are using them for cap equalizers in a power supply I would use metal
film resistors instead. The carbon resistors drastically change value.<
220K could be a bit high for series capacitor equalisers, depending upon the 
leakage current of the capacitor. Even if they're low enough in value (I'd use 
a rule of thumb of resistor current equals 5 times rated max leakage current), 
I agree with Gary. Use MOX instead. Carbons drift like Kon Tiki. 
I had some packs of resistors. A MIL Spec, NATO part numbered 4k7, 5%, 1/4 
watt, carbon comp resistor, packed in a sealed polythene bag in August 1963 
measured, when taken out of the bag 42 years later, 22% high.
73
 
Peter G3RZP
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