Trigger Signal Distributer

Discussion in 'The Projects Forum' started by Mukund jha, Jun 13, 2016.

  1. Mukund jha

    Thread Starter New Member

    Jun 13, 2016
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    i have a trigger signal of 8V and need to be distributed to 4 devices, need techniques to achieve this
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    You can use four diodes, or a cd4016 quad switch,,, ideally we need more information on the devices being triggered..
     
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  3. Mukund jha

    Thread Starter New Member

    Jun 13, 2016
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    There are four individual systems requiring trigger signal to perform some action, they will be connected to my board using bnc cable.
     
  4. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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    An op amp buffer/line driver comes to mind
     
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  5. Mukund jha

    Thread Starter New Member

    Jun 13, 2016
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    I am not getting any fanout buffer/line driver which supports 8V input signal
     
  6. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Emitter follower?
     
  7. AlbertHall

    Well-Known Member

    Jun 4, 2014
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    Trigger signal - frequency, pulse width, amplitude?
    Output impedance of the trigger source and input impedance of the four destinations?
     
  8. Mukund jha

    Thread Starter New Member

    Jun 13, 2016
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    Amplitude: +8 ±1 V

    Drive capacity 75 Ohm nominal load, max trigger duty cycle is 20%.

    Rise time <=30 ns (10-90%)
     
  9. AlbertHall

    Well-Known Member

    Jun 4, 2014
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    That's over 100mA drive current - times 4 four! :eek:
    I agree with Alec_t the first option to try (simulate?) is four emitter followers.
    Amazingly, the golden oldie, NE555, comes close to being able to do this except typical rise time of 100nS o_O
     
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  10. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Simulation shows a 2N3904 should make a fast enough emitter-follower.
     
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  11. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    What about an 8 V power supply and saturated switches rather than emitter followers?
    Also, is there a required min or max fall time?
    Also, since you are using 75 ohm cable, do you need a 75 ohm output impedance to minimize reflections.
    Also, 75 ohms and 8 V makes me thing broadcast facility sync pulses...?
    Also, what are the min and max frequencies of the pulse train?

    ak
     
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