I agree. It might be a red-herring, (and down to my crappy old car), but
have you tried a 'click' counter? I'm sure we've all heard the
interference from the sparks generated by cars on 'quiet' AM/LW radio
stations? As the rev's go up, so does the pauses between clicks.

Just a thought...

s

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Mike105105@AOL.COM
Sent: 19 May 2004 23:46
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE]: how to extract rpm signal from car's dc outlet


Actually the way to read the rpm is by measuring the ignition noise not
the alternator noise.


Mike Hillpot

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