How much protection do I need?

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Article #2791

#2791

From: Brian J. Catlin
Date: Mon, 13 Apr 1992 03:11

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I am planning on building a digital tachometer for my truck.  For the input,
I would like to count the number of times that the ignition coil is pulsed.  
Since there are likely to be some rather large power spikes, I would like to 
know what kind of circuitry I would need to protect my TTL-level circuitry.

Any suggestions would be greatly appreciated.

B. J. Catlin
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-----  Brian J. Catlin                     *  Colorado State University  -----
-----  bc338569@longs.LANCE.ColoState.Edu  *  Electrical Engineering     -----
-----  (303) 491-2841                      *  Fort Collins, Colorado     -----
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Path: arc1-ca.pugleaf.net!sparky!uunet!think.com!mips!darwin.sura.net!gatech!purdue!yuma!ALLISON100.HALLS.ColoState.EDU!bc338569
From: bc338569@longs.LANCE.ColoState.Edu (Brian J. Catlin)
Newsgroups: sci.electronics
Subject: How much protection do I need?
Message-ID: <bc338569.82.703134685@longs.LANCE.ColoState.Edu>
Date: 13 Apr 92 03:11:25 GMT
Sender: news@yuma.acns.colostate.edu (News account)
Organization: Colorado State University  -  College of Electrical Engineering
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