Inductive Pickup Circuit

[Bruce Bowling]

~ 
~ --------
~ 
~    In message <199510152309.TAA11230 at coulomb.eng.ohio-state.edu> , you write:
~  
~ | pickup works.  The ignition system is nothing more than 
~ | an HEI distributor driven by a motor, and 4 spark plugs.
~ | My goal is to make a negative transition logic pulse
~ | from the pickup to drive a counter circuit.
~ 
~ Why not use the tack port on the HEI? i.e., count the driving waveform
~ pulses on the coil primary (divide by 4) rather than the output on the
~ secondary (magnetically coupled at the spark plug wires). Both have
~ considerable ring, but it's *much* less on the primary side and easily
~ filtered. The primary on the HEI is basically 0-12V. I recall using a
~ high speed comparator and a little filtering for a vary reliable TTL
~ tach output... just a thought.
~ 
~ 
A good idea!  But my dictated goal was to demonstrate "transformer"
action to the H.S. kids, and the inductive pickup illustrates how one
can "magically" induce currents into the pickup.  Life would be muck
easier otherwise.

Is the SCR approach the "best" method?

- Bruce

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               Bruce A. Bowling
  Staff Scientist - Instrumentation and Controls
 The Continuous Electron Beam Accelerator Facility
    12000 Jefferson Ave - Newport News, VA 23602
                 (804) 249-7240
                bowling at cebaf.gov  
        http://devserve.cebaf.gov/~bowling
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