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From: ftpam1@acad3.alaska.edu (MUNTS PHILLIP A)
Newsgroups: sci.electronics
Subject: Re: The 555
Message-ID: <1991Jan14.070933.20746@ims.alaska.edu>
Date: 14 Jan 91 07:09:33 GMT
References: <10014@as0c.sei.cmu.edu> <1991Jan13.044249.1640@rodan.acs.syr.edu> <1991Jan14.055718.18614@ims.alaska.edu>
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In article <1991Jan14.055718.18614@ims.alaska.edu>, ftpam1@acad3.alaska.edu (MUNTS PHILLIP A) writes...
>In article <1991Jan13.044249.1640@rodan.acs.syr.edu>, amichiel@rodan.acs.syr.edu (Allen J Michielsen) writes...
>>In article <10014@as0c.sei.cmu.edu> rsd@sei.cmu.edu (Richard S D'Ippolito)
>>>years back!) that there is a fundamental design flaw with the 555 timer
>>>chip, in that there are certain operating conditions and external part
>>>values which could cause part of the chip circuitry to latch up (like a
>>>
>>>Rich
>>   I have used the 555 in many a circuit, and will testify that it is a very
>>good chip.  It may still have a tendancy to lock up at the ends of the design
>>limit, but usually the chip specs from like ti are quite reasonable and
>>reliable.
> 
>     I have noticed in the past that some makes or perhaps lots absolutely
>need bypass capacitors on pin 8 and pin 4.
                                     ^^^^^ Should be pin 5. Sorry. 
Philip Munts N7AHL
NRA Extremist, etc.
University of Alaska, Fairbanks