Classic Circuits You Should Know: Constant Current Source

Classic Circuits You Should Know: Constant Current Source

You can use a single NPN BJT to make a simple constant current source. The output of the BJT is a function of the input current to the base times the BETA (amplification). yes there are more stable and better ways to do this but this circuit if the foundation. You can set the output current by dividing the voltage at the base - .6 by the emitter resistance.

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