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NPN proximity switch feed an LM2907?

Discussion in 'Electronic Design' started by Glenn Ashmore, Jan 31, 2004.

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  1. Not wanting to spend any money on another experiment I need to use an
    Omron NPN proximity sensor as input to an LM2907 Freq to voltage
    converter. I forst thought about an inverter but I don't think that
    would work. Any suggestions?


    --
    Glenn Ashmore

    I'm building a 45' cutter in strip/composite. Watch my progress (or lack
    there of) at: http://www.rutuonline.com
    Shameless Commercial Division: http://www.spade-anchor-us.com
     
  2. CFoley1064

    CFoley1064 Guest

    Subject: NPN proximity switch feed an LM2907?
    Hi, Glenn. Looks like a good plan, as long as your Omron sensor will work
    within the LM2907 power supply limits. I've successfully done this exact thing
    several times. First, use a pullup of around 1K from the sensor output wire to
    V+. Second, follow the datasheet to get your values. If you're using the
    LM2907-8, capacitively couple the Omron output to the tach input (pin 1) using
    a .01uF cap and another 1K pullup. If you're using the 14 pin version, set the
    trigger point at 1/2 Vcc. Use a well filtered power supply. Also, try to
    scope out the voltage output for desired minimum ripple, and desired frequency
    response. The national data sheet and app note have the information you need.

    http://cache.national.com/ds/LM/LM2907.pdf

    http://www.national.com/an/AN/AN-162.pdf

    Good luck
    Chris
     
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