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Tone Detector

Discussion in 'General Electronics Discussion' started by stuart smith, Feb 3, 2016.

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  1. stuart smith

    stuart smith

    9
    0
    Aug 4, 2015
    Hi all,

    Thinking about using a tone detector.
    Namely NJM567.
    Just getting back into electronics so a bit ropey. Does anyone know from the datasheet what the voltages will be when then the tone dector is running.

    ie) detects the right frequecy what will it output? same for wrong?
     
  2. KMoffett

    KMoffett

    719
    73
    Jan 21, 2009
  3. Harald Kapp

    Harald Kapp Moderator Moderator

    10,223
    2,202
    Nov 17, 2011
    Don't forget to add the external pull-up resistor as the output is open drain.
     
  4. stuart smith

    stuart smith

    9
    0
    Aug 4, 2015
    Thanks for the reply.
    Data sheet says:
    The frequency range, centered about fO, within which an input signal above the threshold voltage (typically 20mVrms)
    will cause a logical zero state on the output. The detection bandwidth corresponds to the loop capture range.

    Does that translate that if the frequency is within the bandwidth set (ie) frequency is within range then the output will be logic zero (typically zero volts).
    And if the freqency is outwidth this bandwith then will be logic one? Ie typically 5V.

    Regarding the pullup resister? is this to compensate for any switching when the output will be floating?
     
  5. Harald Kapp

    Harald Kapp Moderator Moderator

    10,223
    2,202
    Nov 17, 2011
    The pullup resistor is required to create a logic high potential at all. Without it, you'lll see only logic low or an open output. Read up on pull-up resistors e.g. in the respective Wikipedia article.
     
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