darlington array question

Discussion in 'General Electronics Chat' started by adamclark, Oct 6, 2013.

  1. adamclark

    Thread Starter Member

    Oct 4, 2013
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    hello all... Im sort of new to electronics with a very knowledge. I can read schematics and assemble basic circuits.. Im just now truly learning transistors, I have a fair understanding of resistors and was just taught a lesson in leds in my first post here.. I like to reuse scavenged electronics from old broken things I find.. I recently found a darlington array chip and after searching the net for a datasheet, I learned that it is essentially just 7 transistors in on piece... Being a newbie and wanting to learn as much as I can I was hoping someone might be able to suggest some newbie project I can do to help me understand how to use this and learn how to identify the need for it in future projects of my own..
     
  2. ScottWang

    Moderator

    Aug 23, 2012
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    767
    According what you described that it seems like as ULN2003, also the ULN2803 is 8 darlington pairs, the total Imax=500mA, whatever you are using anyone or total 8, they all can providing the same current.

    But for the heat and the products using life, so you better using it less than 1/3 of 500mA, it will be about 166.667mA.
     
  3. adamclark

    Thread Starter Member

    Oct 4, 2013
    472
    6
    Its uln2003a.. I googled a datasheet and it said its a 7 pair darlington array... im not quite up to speed on transistors and am looking for a simple project to understand the use of this.
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Did you want a project to enable you to use the ULN2003 or did you want a break down of what a Darlington is?
    A typical use of the arrays is to transition from TTL to say higher current 24vdc operating devices.
    Or stepper motor driver etc.
    Max.
     
  5. adamclark

    Thread Starter Member

    Oct 4, 2013
    472
    6
    I have a problem learning from technical explanations and ive read the datasheet and other explanations on the web.. The only way I can learn is from hands-on doing.. So what I really want is a small basic project using one so I can learn from it as I build it... I just don't want to burn it up not knowing how to use it.. I don't care if its lighting up leds, I just want to learn how it works by using it.. Ive read something like it multiplies voltage or something.. maybe something where I can meter the output to understand how it does that..
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
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    You could just use a switch on the input side that sets the input from a 5vdc supply and place a LED with a series resistor using say a 12vdc supply and switch the LED on/off on the related output.
    http://digital-diy.com/general-electronics/101-tip-uln2003-high-power-driver.html
    This shows a Micro but you would substitute that with a simple on/off switches and LEDs with suitable resistor on each darlington..
    Max.
     
  7. adamclark

    Thread Starter Member

    Oct 4, 2013
    472
    6
    thank you sir.. Like I said ive never been able to learn by theory.. I can learn quickly and retain information, However I have to learn by hands-on and have things explained in dummy terms..
     
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