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vr sensor negative pulse

Discussion in 'General Electronics Chat' started by yougarage, May 2, 2013.

  1. yougarage

    Thread Starter New Member

    Nov 29, 2010
    Hi, I have a variable reluctance sensor(a pick up) monitoring a half moon wheel.One wire of the sensor is grounded. It's output is a positive pulse when the pickup meet the full edge of the wheel, and a negative pulse when it meets the other edge. I need to pick these signals to feed a mcu, I know how to condition the positive one, but how can I pick the negative one? Ground is shared between the mcu and one side of the pickup.
    I tought of a pnp transistor, do you suggest anything better?