help design of round counter

Discussion in 'The Projects Forum' started by medridha, Mar 3, 2010.

  1. medridha

    Thread Starter New Member

    Mar 2, 2010
    6
    0
    i need circuit to build a round counter using optical diode and transistor and convert this signal in value in round per minute
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    That would be a tachometer. Google the data sheet for an LM2907.
     
  3. medridha

    Thread Starter New Member

    Mar 2, 2010
    6
    0
    but plz do you have the circuit using this LM
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    There are several examples in the data sheet. Take the signal off the optotransistor, between the collector and the resistor to the voltage source.
     
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