Data Acquisition newbie question

[Brian Dessent]

Don DRI05 Ricciardiello wrote:

> I'm looking at the dataQ starter kit as a way of diving into the murky
> waters of data acquisition without the up front capital outlay and was
> wondering if anyone could help me understand the tracking engine rpm data.
> How do you input this signal into the dataq module as a voltage?

Take a look at the LM2907 or LM2917 chips from National Semi:

http://www.national.com/ds/LM/LM2907.pdf

They are designed for just this purpose.  The application hints section
of the datasheet show sample circuits that output a voltage proportional
to RPM using either the crankshaft position (reluctance) sensor signal
or the ignition coil primary.  All you need is their chip and a few
resistors.  The datasheet shows many interesting automotive applications
in fact.  Plus if you go to their website (www.national.com) you can
order samples of the chip shipped overnight for free. (!!)

Brian
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