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Open Collector using ULN2003A

Discussion in 'General Electronics Discussion' started by Sparks_21, Feb 18, 2011.

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  1. Sparks_21

    Sparks_21

    17
    0
    Dec 3, 2010
    Hi guys I wonder if you could help me,

    Here is a simple circuit that i am using.

    when the Switch is open, i need it to trigger my LCD module Board that requires open collector inputs. - 6 inputs will display 6 different messages when activated.

    So here comes the question, if i take the output from this (from zone 2) and feed it into the ULN2003A (Darlington Transistor Array) and then the output from that too the inputs of my LCD module will this trigger it?

    I will try to supply as much Information as i can,

    Thanks in advance

    Marc
     

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  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,305
    2,738
    Jan 21, 2010
    Firstly, a 4050 does not have an open collector (or open drain) output.

    You could put a diode in series with the output, the cathode closest to the 4050's output and you would achieve a similar effect.
     
  3. Sparks_21

    Sparks_21

    17
    0
    Dec 3, 2010
    Right ok, Thanks for your reply.
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,305
    2,738
    Jan 21, 2010
    I misread your question. the ULN2003 or whatever probably has open collector outputs. But I doubt that you need so much power for your application. I would try the diode trick with your buffer first.
     
  5. Sparks_21

    Sparks_21

    17
    0
    Dec 3, 2010
    I got it working with the ULN2003A
     
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