​ ​ ​ ​ Using PNP Transistors on a 7 segment display. am I doing it right? - Page 2
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Thread: Using PNP Transistors on a 7 segment display. am I doing it right?

  1. #11
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    Thankyou everyone
    For keeping me from messing up with the transistors.
    I found a surface mounted Darlington array that will do the job and save space.

  2. #12
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    Quote Originally Posted by Marmitas View Post
    Thankyou everyone
    For keeping me from messing up with the transistors.
    I found a surface mounted Darlington array that will do the job and save space.
    Next time, you can use APA102 ==> no driver needed ==> no space for driver, only 2 Picaxe pins needed...
    There are 10 types of people in the world: those who understand binary, and those who don't.

  3. #13
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    Hi,

    Quote Originally Posted by Marmitas View Post
    I found a surface mounted Darlington array that will do the job and save space.
    But does your "Darlington array" have the additional internal inversion stage (as does the 2981) that is required to drive the Cathodes with the correct signal phase? Like Martin and Goey, I can't see how a normal "Darlington" could drive the Cathodes correctly, because it would invert the voltage polarity from the MAX7219.

    Cheers, Alan.

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