In a message dated 98-01-19 12:06:16 EST, you write:

<< Hi Dave

 Sorry to be nit picky, but it will. How do you think that a lot of OEM
 or after market engine control modules work. They have a disk with
 multiple notches, (dependant upon the number of cylinders and the
 degrees accuracy needed) mounted to the front of the crank shaft.

 They mount a Hall Effect package to sense the notches in the disk. From
 what I understand the automotive package (what I suggested) has a hall
 effect sensor and a magnet to give a DC field. These packages have three
 leads, power, ground and output. A lot operate off 5V and give a 5V
 square wave  output because of an inbuilt Schmitt trigger.

 To see a hall effect used in this manner look up a data book on hall
 effect sensors for either notch or gear tooth sensing or I would be
 happy to email you a copy of an Allegro sensor to give you an idea of
 the principle.

 The easiest way is to go to an auto junk yard and grab one out of a car
 with an engine control module (a late model fuel injected car).

 Peter G.
 peter.graham@dsto.defence.gov.au >>


Peter...Peter...Peter...

A Hall efect sensor all by its itty bitty self WON'T!!!!!!
It requires a magnet to bias the thing.  OK?????

I have defended this thred long enough.  I have used enough Hall sensors to
know what I am talking about.

The original post (What seems a hundred or so years ago for those of you
recieving email by dog sled) simply stated a Hall effect sensor......NOT a
Hall effect interupter or slot sensor.  The added magnet makes all the
difference in the world.  I was simply trying to prevent some poor guy on his
boat with a 99 cent surplus Hall transistor for wasting too much time.

Enough said already.  I am related to popstal workers and I am not afraid to
use them!!!!!!

Dave