running 24v from an arduino?

Discussion in 'General Electronics Chat' started by matelot, May 18, 2014.

  1. matelot

    Thread Starter New Member

    Apr 15, 2013
    24
    0
    I am updating a monitor board (by building a new one) that consists of lots of LEDs (around 60).
    The board runs from a 24 volt circuit so all the LED's will have 1.2Kohm resistors in series.
    I want to be able to build a test unit to plug onto the board and run it with an arduino.
    The arduino works on 5v.

    Even if I use a number of shift registers (I have enough experience of writing arduino software to drive shift registers) I will still need some way of increasing the output to 24v.
    Is it possible to do this with NPN's (I have plenty of C945's) or other NPN/PNPs (I have lots of old boards that are populated with various transistors)?
    Alternatively could I do it with FET's?

    If not is there any other way I could do it in solid state? If I use relays I will have to buy them (more than 60) and the size of the test unit will be bigger than the board itself.
    I have experience of making printed circuit board and building small circuits.

    I know I could run it from 5v and the LED's would show up dimly but I would like to build the circuit.

    Thanks,
    Bob.
     
  2. #12

    Expert

    Nov 30, 2010
    16,298
    6,808
    This is easily done with bipolar or mosfets. These aren't "finished" to your specs, but this activity is so common that I have several drawings in stock.
     
    absf likes this.
  3. enggricha

    Member

    May 17, 2014
    62
    1
    if you have multiple signals Darlington arrays like ULN2008 are a faster and sometimes cheaper way of doing it.
     
  4. matelot

    Thread Starter New Member

    Apr 15, 2013
    24
    0
    thank you #12 I will try those and let you know.

    sometimes enggricha I am suprised how little people read before posting.

    Code ( (Unknown Language)):
    1. Is it possible to do this with NPN's (I have plenty of C945's) or other NPN/PNPs (I have lots of old boards that are populated with various transistors)?
     
  5. #12

    Expert

    Nov 30, 2010
    16,298
    6,808
    enggricha was trying to tell you that you can get several transistor in a dip package. They take up a lot less space on the circuit board.
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,548
    2,373
    I use them all the time, and the ULN2805 gives you one more! ;)
    Max.
     
Loading...