Re: How much protection do I need?

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Article #2964

#2964

From: Dave Medin
Date: Tue, 14 Apr 1992 22:27

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In article <1992Apr13.043121.11482@athena.cs.uga.edu>, mcovingt@athena.cs.uga.edu (Michael A. Covington) writes:
|> I have had no trouble using 7805-type voltage regulator chips as the
|> only thing between the automotive 12V line and the device I wanted to
|> power.  Well, maybe put an RF choke ahead of it too...
|> 
|> By the way, most of the ripple in the 12V line comes from the spark
|> plugs firing.  The _interesting_ way to do a tachometer would be to
|> measure the ripple itself, thereby avoiding any connection to the engine.

Careful what you mean by ripple. On the average car, the main ripple
(RMS) is from the alternator, not the ignition. The ignition
noise has much faster risetimes, though. Either could be counted
and are proportional to RPM.

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     Dave Medin				Voice: (205) 730-5812 (w)
  Intergraph Corp.			       (205) 837-1174 (h)
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   *********Everywhere You Look...(at least around my office)***********

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Message-ID: <1992Apr14.222737.27270@b11.ingr.com>

Path: arc1-ca.pugleaf.net!sparky!uunet!infonode!ingr!b11!catbyte.b11.ingr.com!medin

References: <bc338569.82.703134685@longs.LANCE.ColoState.Edu> <1992Apr13.043121.11482@athena.cs.uga.edu>

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Newsgroups: sci.electronics
Path: arc1-ca.pugleaf.net!sparky!uunet!infonode!ingr!b11!catbyte.b11.ingr.com!medin
From: medin@catbyte.b11.ingr.com (Dave Medin)
Subject: Re: How much protection do I need?
Message-ID: <1992Apr14.222737.27270@b11.ingr.com>
Sender: medin@catbyte (Dave Medin)
Reply-To: medin@catbyte.b11.ingr.com
Organization: Intergraph Corporation, Huntsville AL
References: <bc338569.82.703134685@longs.LANCE.ColoState.Edu> <1992Apr13.043121.11482@athena.cs.uga.edu>
Date: Tue, 14 Apr 1992 22:27:37 GMT
Lines: 24

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