----------
> From: Olin Lathrop <olin_piclist@EMBEDINC.COM>
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: Car Tachometer
> Date: Saturday, March 24, 2001 2:55 PM
>
> > On the MSD (Multi Spark Discharge) boxes, there is a short burst of
> voltage
> > spikes to fitre the plug several times. It simulates the type of plug
> > firing you get with points. The multi sparks stop at about 3k rpm or so
> > because of time constraints.
>
> What a concept!  So we now have sophisticated electronics going out of
its
> way to simulate bouncing of old fashion mechanical contacts.  What's
next,
> tuners with DSP filters to simulate the old fashion AM radio sound?

How about transistors that simulate tubes in guitar amplifiers?
>
> Anyway, if this is the case then it should be easy to get rid of the
> multiple pulses by something akin to a debouncing circuit.  You should be
> able to push most of the logic into the firmware and keep the electronics
> rather simple.  You know that engine speed can't change drastically from
one
> revolution to the next, so it should be rather easy to ignore all pulses
for
> the first half cycle (for example) after detecting one.
>
>
> ********************************************************************
> Olin Lathrop, embedded systems consultant in Littleton Massachusetts
> (978) 742-9014, olin@embedinc.com, http://www.embedinc.com
>
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