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From: "Phil Allison"
Subject: Re: how to reduce noise from 555 timer...???
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Sat, 21 Dec 2002 11:03:05 +1100
NNTP-Posting-Date: Sat, 21 Dec 2002 10:51:24 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"Kevin McMurtrie" wrote in message
> In article ,
> "Phil Allison" wrote:
> >"Kevin McMurtrie" wrote in message
> >> Is your timer capacitor an electrolytic? You better open up your
> >> electronics book and read up on them.
> >They are constantly shorting and
> >> self-reparing.
> > ** Can you provide a reference for this ???
> Find a ~100uF capacitor that hasn't been powered up in a while. Try to
> charge it through a 1M resistor. It won't charge or it will hesitate at
> certain voltages.
** You are describing a very old and DEFECTIVE cap - one that needs
Charge up the capacitor with a higher current and
> leave it charged for a while. Now discharge and repeat the 1M test.
> Now it charges smoothly.
** Your claim is bullshit when applied to electros in general.
> They're fine for many audio applications but they will not operate an
> oscillator at a constant frequency, especially if the current is low.
** The issue is leakage current - which increases with temp.
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