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i want to activate a dc motor via a specific frequency can you help me?

Discussion in 'General Electronics' started by David, Apr 14, 2004.

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  1. David

    David Guest

    Hi, i want to activate a dc motor via a specific frequency between
    50Hz an 1kHz.When we got this specific frequency, i want the motor run
    the time this frequency is there.

    Do you have any idea how i can make this kind of circuit or any web
    site that can help me please?

  2. Seth Koster

    Seth Koster Guest

    Does it need to be exactly a certain frequency or any frequency in
    a range, and if in a range what range would that be? Does it need to
    cut off at a high resolution, or can you tolerate the circuit cutting
    off the motor at 'about' frequency X (within how many Hz?)?
    Depending on your needs, a bandpass filter driving some sort of motor
    switch (what kind depends on your output) might do it. More specific
    information about your output would help (voltage, amperage, frequency
    or frequency range). Also more information about the frequency
    resolution required of the circuit would help.
  3. JeffM

    JeffM Guest

    .-------. .-------. / \
    | | | OPTO | | |
    ---| LM567 |---| TRIAC |---| MOTOR |
    | | | | | |
    `-------' `-------' \_______/
  4. JeffM

    JeffM Guest

    Lets try that again.
    .. _______
    .. .-------. .-------. / \
    .. | | | OPTO | | |
    ..---| LM567 |---|COUPLER|---| MOTOR |
    .. | | | | | |
    .. `-------' `-------' \_______/
  5. David

    David Guest

    Thanks for response. the range of frequency i would like to use his
    between 50 to 500 hz. the voltage range is the same as audio output on
    a computer audio card between 0v to 5v I think.

    thanks for the schema but the lm567 is a discontinued part. maybe
    they're an alternative to this ic? or a filter can do the same? I want
    to adjust between the range of 50hz to 500hz.

    thanks for the help
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