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Transistor LED driver

Discussion in 'Electronic Basics' started by Conrad, Robert, Dec 6, 2003.

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  1. Is there some kind of pre-built transistor driver that comes in a small IC

    I currently have a bunch of transistors and resistors on my PCB design and I
    am looking to clean it up if need be. I need to take a 0 or 5V input and
    turn on a 30ma 9V output. Is there an easy way to setup this up other than
    having components all over my PCB?
  2. CFoley1064

    CFoley1064 Guest

    Is there some kind of pre-built transistor driver that comes in a small IC
    Hi, Robert. The standard solution for the problem you describe is a peripheral
    driver IC such as the ULN2003 (7 TTL inputs, 7 high voltage darlington
    outputs), ULN2004 (7 CMOS inputs, 7 HV darl. out), ULN2803 (8 TTL in, 8 HV
    darl. out), and ULN2804 (8 CMOS in, 8 HV darl. out). Transistors and resistors
    are built in on the chip. ST and a number of other manufacturers make them,
    and they're less than a buck each at DigiKey. They also have built-in
    protection diodes to help with inductive kick when driving relays.

    Good luck.
  3. One more question for you if you don't mind.

    Whats the name of the 8 or 16 bit bus selector chip? I can't seem to
    remember what that thing is called at all..
  4. Ian Stirling

    Ian Stirling Guest

    <snip quoted message incorrectly placed at bottom>

    Me neither.
    However, last time I looked, had a very nice
    selection guide for logic parts, where you can search by function,
    rather than part number.
  5. RD

    RD Guest

  6. Rober, Chris,

    A "good" old 74LS07 will also do the job. Six 30V, 30mA open collector
    outputs in a 14 pins DIL package.

  7. I have 5 control lines going to my PIC's that need to be selected and
    disabled. Each is an I, O, or both an IO. I need something that can sit on
    this bus and enable the lines going to each PIC. (There will be up to 32
    PICs on this bus, and the controlling PIC.
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