Inductive Pickup Circuit

[Bruce Bowling]

~ 
~ In a message dated 95-10-15 19:45:23 EDT, you write:
~ 
~ >Ripping apart the timing light and following the circuit
~ >around concluded that the pulses from the pickup are
~ >fed into a gate of an SCR (through a 100 ohm resistor,
~ >and 0.002 micro cap to ground). 
~ 
~ 
~ 
~    If there was only 100 milivolts out of the inductive-pickup-coil you would
~ never forward bias (and hence turn on) the SCR. Did you have the coil
~ connected drectly up to the 50-ohm imput of your scope? This could give you a
~ deceptive "feel" for howmuch voltage you will see across the picup. 
~ 
~     ---Lou
~ 
You are right - an SCR needs about 0.8 volts, and some trigger current.  I did
just hook the probe to the 50 ohm input, since I am not really sure what
signal I was going to get.  

- 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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