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RE: [Electronics_101] Rpm Sensor (inductance type?)

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  • Toby Paddock
    Here s a couple of simple things I did with some Allegro hall sensors. They make it real easy these days. The ones I used only have 3 pins: +5V, ground, and
    Message 1 of 4 , Jul 10, 2001
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      Here's a couple of simple things I did with some Allegro
      hall sensors. They make it real easy these days. The
      ones I used only have 3 pins: +5V, ground, and output.
      I don't know about max frequency, but you can follow
      the links to their site. There's linear and switching
      output types. And one is a switch that turns on when
      it sees either pole of the magnet. Free samples online.

      Magnetic Sensor as a Control Voltage Source
      http://www.seanet.com/~tpaddock/mag2cv.html

      Whirly-Whirler LFO
      Spinning plate toy and magnetic sensor as a
      mechanical Low Frequency Oscillator.
      http://www.seanet.com/~tpaddock/spin_lfo.html

      - -- - Toby Paddock

      ----------
      bbranham@... wrote:
      >Does anyone know what type of a component I can use
      >for an inductance sensor (kind used in like automotive
      >timing lights) I would like to generate a logic pulse per
      >voltage pulse for use in a Basic stamp Tachometer for
      >use on small engines. Will se up to absol. max 10,000
      >rpm's. Any body have any ideas. Otherwise does
      >anyone have a good expanation of how a hall effect
      >sensor works and if i could use it to send a pulse out
      >as the magnet of the flywheel spins past the sensor.
      >THanks all


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    • markallen
      Hi, I have a circuit that tries to run a solenoid by using a reed relay to connect the power. The circuit+relay works fine if I try and connect a motor, and
      Message 2 of 4 , Jul 11, 2001
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        Hi,

        I have a circuit that tries to run a solenoid by using a reed relay
        to connect the power. The circuit+relay works fine if I try and
        connect a motor, and the solenoid works fine if I just connect it
        direct to the power source. it seems like maybe my relay is switching
        on and off really fast instead of just staying on, does this seem
        possible and could it be the problem?

        any advice appreciated,

        Mark
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