Here is my new trigger wheel. I am getting it ready for a Lamar
ignition demo at Sun N Fun in 2 weeks. It will also work with the RX8
CAS. Fires at 20 deg BTC and 4 or 5 times after that every 10 degrees
of e-shaft rotation.

Paul Lamar


Here is my DC motor eng sim along with a movie and scope pictures. It
is working and ready to go.

You can see the six triggers on the scope.

This is an ABS sensor about one fifth the cost of a Mazda CAS. Less
than $20.

They are manufactured in the millions and just about every car has 4
0f them. My 2 rotor ignition set up  needs two.

Paul Lamar


I've got to ask a question re the trigger traces;  why is the rise on the
6th trace higher than the previous 5 traces?  Then I notice that the fall
is lower on the 1st trace of the next set.  Just curious and there is
probably a simple explanation.

It all appears to be looking good...  It will be interesting to see the
response at Sun N Fun.

Gary Knutson

The amplitude is highly dependent on the spacing of the sensor
from the teeth. The spacing is somewhere between .020" and .050"
Any run out or wobble of the sprocket will cause variations in
the amplitude of the signal.  I machined it on my cheap Chinese
lathe. Nuff said :)


Fortunately the electronics doesn't care about amplitude as long
as it is high enough to trigger. Generally about 1/10 of what
you see here. This is the chip I use to handle the ABS and Mazda
CAS.

Paul Lamar


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