They are picking up the alternator
On Mercedes trucks and diesel cars, the first sign of alternator brushes
wearing out is a jumpy tacho

Peter Cousens
cousens@biscit.biz

> -----Original Message-----
> From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]
> On Behalf Of Picdude
> Sent: Wednesday, July 16, 2003 2:56 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [OT]: Car Tach designs
>
> Ugh ... The intention here is to pick up the noise induced on the line
by
> the
> spark-plug wires.  Unless you absolutely cannot get the signal from
the
> engine for some significant reason, I hate this idea.  Design it
properly,
> I
> say.
>
> Cheers,
> -Neil.
>
>
> On Tuesday 15 July 2003 18:23, Mike Hord scribbled:
> > I don't have any links, but I do have a suggestion.  Someone
suggested
> > a few weeks ago that monitoring the cigarette lighter voltage on a
car
> > can be used to extrapolate the speed of the engine.  I don't know
what
> > the relationship is; my suggestion, stick an o-scope on it and find
out!
>
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