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BJT for 7 segment display

  1. Dec 5, 2011 #1
    May i know what is the use of the npn and pnp bjt for my schematic? can someone please advise. Thank You
     

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    Last edited: Dec 5, 2011
  2. jcsd
  3. Dec 5, 2011 #2
    I would guess they're acting as controlled switches. BJT switches generally have the advantage of allowing more current to pass than can be drawn from the output of many chips.
     
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