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

Constant current source

  1. Dec 18, 2011 #1
  2. jcsd
  3. Dec 18, 2011 #2
    A good starting point would be a single transistor with you load in the collector circuit.
    The current would be set with the bias voltage at the base (eg 1.7V) and the value of the emitter resistance (eg 1k).
    This would give an emitter and collector current of more or less I = 1V/1k.......1mA
  4. Dec 18, 2011 #3

    jim hardy

    User Avatar
    Science Advisor
    Gold Member
    2018 Award

  5. Dec 18, 2011 #4
    I should have mentioned before. My load is connected to ground.
    I am trying to make a low voltage(0.2v or 0.3v), voltage reference using constant current source.
    I could use a standard voltage ref and divide it using resistors. But I thought using current source would be cool.
    There are a few voltage ref chips available with low voltage. But I am more interested in the current source.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook