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Help with circuit

  1. Oct 22, 2012 #1

    Can anybody help me in telling me what the two transistor in the picture of circuit i attatched are being used for?

    Thanks in advance

    Attached Files:

  2. jcsd
  3. Oct 22, 2012 #2


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    They are both being used as 'drivers' to supply more current to the LED and Buzzer than the Integrated Circuits can deliver. Look up " electronic driver circuits" to see more examples.

    Is this a Homework Question?
  4. Oct 22, 2012 #3
    nope it's just a general question and thanks for the quick answer.
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