Kevin,

  I set one up on the bench. It is in the category of "Inductive Solid
  State".

  I was right about one thing. There is a one shot in there but it only
  controls how
  long the coil is grounded by the switching transistor. 0.2 milliseconds
  over a wide
  RPM range. That is not to say the coil will not ring long after that.

  The coil fires when the computer pin goes low.

   The rest of the time the coil is charging or heating up from DC current.
  The coil
  itself is .3 ohms but the ballast resister is .5 ohms so that is a lot of
  current.
  About 15 amps. Obviously the ballast resister is switched out on starting.
  There is another brown wire that bypasses it. Not shown in the schematic
  but you can
  see it in the pictures.

  Here is a schematic with the color codes of the Mazda part.

  I replaced the coil with a 25 ohm power resister for testing  because I
  did not want
  sparks flying all over the place. Interestingly if the RPM falls too low
  the system
  shuts down. This prevents the coil from over heating while the car is
  stopped with
  the ign switch on.

  Paul Lamar


 Paul, your shop looks a bit neater than my work area. I tend to make the
 best use of my time by multitasking- like when I am waiting for fiberglass
 to cure out, I go on to something else, I go until I need a bolt or part,
 then add to the list, etc.

 After some more testing and planning, I have decided to take a second CAS
 unit and modify it. I plan to remove one of the top tits and install a
 second inductive coil 180 degrees from the first. I think that with my ever
 so simple system, the tits 180 apart firing twice per revolution will
 require cause ignition issues with timing that will require either lots of
 code, or additional hardware modification. I thought about a simple
 equation related to RPM that would delay the spark of the second rotor, but
 then the thought hit me that there are no teeth missing on the lower array
 and therefore no indexing signal for an interrupt, so when I turned off the
 key, the ignition system could be oriented 180 degrees out of phase the
 next time I tried to start it. So, I think that removing one tit from the
 CAS and adding the other pickup will let me signal the coils to fire at
 TDC, and I can also include a delay to retard the timing while under boost
 with code.

 Today I have boat repair to get to, so I will have time to think about it
 more while I am sanding :).

 Kevin Alderman

 I am going to a bit more experimenting with the 2nd gen igniter.
 The ultimate non CD is coil on plug.

 Paul Lamar

Just a thought. How about two sets of teeth. One with three teeth on
top, and a second set with two teeth 180 degree from it? First teeth
on both sets are exactly 180 degree apart? The extra teeth tells us it
is the top even after stopping the unit.

Also, if we were to calculate delays for ignition, having an extra
signal 180 degree apart can let us know if the engine is accelerating
or decelerating. We can do some fine tuning on timers as well.

Henry

Opens up a whole new group of possibilities.

Paul Lamar
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