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vibration detector

Discussion in 'Electronic Basics' started by Jimlhebert, Feb 23, 2004.

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  1. Jimlhebert

    Jimlhebert Guest

    Need a circuit diagrame for a simple vibration detector that will sense when my
    table saw is on and operate a small relay.
  2. CFoley1064

    CFoley1064 Guest

    Subject: vibration detector
    If you've got a 120VAC table saw, why not just put a 120VAC relay coil across
    the motor wires?

    Good luck
  3. I would make a current relay in an extension cord that pulls in when
    the load plugged into the cord is drawing current. Then plug the saw
    into that extension cord. I once made one of these to turn the
    furnace blower on when the window air conditioning compressor turned
  4. Jamie

    Jamie Guest

    well i think if you have it powered up you have power that you can use
    to trip a relay, hook into the switch!.
    or are you talking about the spin down ?
    there are a couple of ways..
    one is to place a hall effect or some optical sensor on the shaft ,
    or place a round magnet around the shaft and use the spinning effects
    to push onto a steel switch.
    the other ways is to make a circuit that monitors the regeneration
    of the motor as it spins down.. motors will act like generator when you
    disconnect power , while waiting for it to spin down i will generate
    so if you were to make a low voltage monitor device that will also
    handle the line voltage when on you have a good indication of when the
    blade stops spinning.
    using a simple OP-Amp protecting the inputs via high value resisters
    into a zener you can drive a voltage comparator..
    if interested i guess you could ask more about it.
  5. JeffM

    JeffM Guest

    Need..a simple vibration detector
    Popelish has it right: 1st dump the vibration idea.

    This question has been asked here before, in almost identical words.
    (Google is your friend; learn to use it.)*+table-saw+switch+relay&btnG=Google+Search

    Jim Thompson came up with a specific (and excellent) solution:

    Popelish's extension-cord-assembly idea is the final touch.
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