Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Darlington Pair

  1. Mar 31, 2010 #1
    I have a small problem regarding darlington transistor pairs.

    Lets say a source is connected to the coupling capacitor Ci and this source has an internal resistance of for example 10kOhms. When finding the Output resistance of the darlington, should the internal resistance of the source be taken in consideration?

    Thank you

    Note: The coupling capacitors are assumed equivalent to a short at signal frequency

    Attached Files:

    Last edited: Mar 31, 2010
  2. jcsd
  3. Apr 1, 2010 #2


    User Avatar

    Yes, the internal resistance of the source is in parallel with R1 and R2.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook