NAMUR input simulation

Discussion in 'Embedded Systems and Microcontrollers' started by Negativ3, Dec 5, 2011.

  1. Negativ3

    Thread Starter New Member

    Dec 5, 2011
    3
    0
    Hi All!

    I have an arduino cct I can use for simulating the "shorting" of NAMUR inputs (+/-) to provide a signal input, and it works well.

    I was wondering if its possible to do this in a single, self-contained circuit, drawing power from the NAMUR +ve rail?

    I have ideas of using a 555 to set the pulse frequency, but not sure where to start on the output, shorting of contacts part... drive a transistor off the trigger output possibly?

    Any guidance really appreciated.
     
  2. Negativ3

    Thread Starter New Member

    Dec 5, 2011
    3
    0
    Oops, mods, can you please move this to the correct forum? Thanks
     
  3. Negativ3

    Thread Starter New Member

    Dec 5, 2011
    3
    0
    Here is the cct I have so far but it's not pulsing to the base of the BC546.
    Sw1 should be continuous mode, frequency set by Sw3 position. Sw2 is for a single pulse.

    Any help appreciated...
     
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