Voltage of square wave

Discussion in 'General Electronics Chat' started by ne89, Oct 14, 2007.

  1. ne89

    Thread Starter New Member

    Sep 25, 2006
    9
    0
    hi all
    I want to measure the voltage of 75 Hz bipolar square wave with single ended ADC as voltmeter.
    What is the good method to measure it?
    I need your help please.
    Thanks
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Bipolar into single ended won't work at the ADC. You can use an op amp to offset the square wave to unipolar, although a bipolar ADC might be preferable. You would probably want another circuit to detect the rise of the square wave and then trigger the conversion

    What is the magnitude of the square wave?
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Well, what about floating the input between ground and the positive rail?

    See attached (connections to ADC omitted except for Vin)

    Wouldn't that work?
     
  4. kender

    Senior Member

    Jan 17, 2007
    263
    0
    The most general ways to convert the bipolar into single ended is ti use a difference OpAmp, InAmp or balun transformer. InAmp will give a more precise conversion. InAmp will work for your low frequency.

    Could you post a sketch block diagram that shows the source of your bipolar square wave, your adc, power supply and the (common?) ground?
     
  5. ne89

    Thread Starter New Member

    Sep 25, 2006
    9
    0
    Thank you for your kindly help

    What is the suitable type of general opamp as single supply InAmp for my low frequency?
     
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