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Circuit to turn a square signal to a VR signal

Discussion in 'General Electronics Discussion' started by katana, Mar 5, 2012.

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  1. katana


    Mar 5, 2012
    This is an automotive type application. The engine has a variable reluctance sensor on it and I need to signal this to make an engine controller think it's watching an engine run. I have a micro which can be programmed to output any squarewave I like.

    What sort of circuit can I use to turn a standard squarewave output signal into one that looks like VR signal.


  2. Rleo6965


    Jan 22, 2012
    In automotive ignition system. Variable Reluctance or signal from Reluctor was converted into square wave pulse as trigger signal to ecu or cdi.

    Why do you still have to convert square into sine wave reluctor signal?
  3. katana


    Mar 5, 2012
    I need to have the engine controller believe it sees a proper VR signal. I'm not sure if a simple squarewave pulse will do it since I think the controller probably triggers on the 0 crossing.

    In short I suspect there is probably a simple analog circuit with an inductor that can turn a simple squarewave into this sort of signal. I just don't have much expertise in analog circuits.
  4. john monks

    john monks

    Mar 9, 2012
    Driving a transformer through a capacitor with your square will get you there to some degree. Ultimately you will need an arbitrary waveform generator. The waveform you are looking at is what you typically see from a coil sensor from a distributor with a moving magnet.
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