120V AC to 60HZ Square wave

Discussion in 'The Projects Forum' started by krogerson2, Jan 28, 2009.

  1. krogerson2

    Thread Starter Member

    Jan 8, 2009
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    0
    I need help taking a ac voltage and converting it to a 60HZ square wave to drive a digital clock. I am not sure what type of recitfier to use and how to go about constructing it
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    You need a transformer.
    Have a look at Bill Bowden's binary clock schematic:
    http://ourworld.compuserve.com/homepages/Bill_Bowden/clock.htm
    Upper left corner; he used a center-tapped transformer, and picked up the 60Hz signal from before the rectifier, then fed it through a Schmitt-trigger inverter. You could use a 4093 quad NAND Schmitt trigger or a 40106 hex inverter or the listed 74HC14 hex inverter.
     
  3. krogerson2

    Thread Starter Member

    Jan 8, 2009
    24
    0
    I have a transformer i am just not sure about the rectifier circuit
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    OK, so tell us about your transformer.
    Does it have a 120V primary?
    What is the secondary voltage?
    Is the secondary center tapped?
     
  5. krogerson2

    Thread Starter Member

    Jan 8, 2009
    24
    0
    it has a 14V secondary voltage and yes it is center tapped
     
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