MadSci Network: Engineering

Re: How to obtain a constant current source?

Date: Mon Jan 19 11:21:42 1998
Posted By: Gus Calabrese aka puppet boy, Design Engineer
Area of science: Engineering
ID: 885206202.Eg

A constant current source is usually created by 
monitoring the voltage drop across a resistor 
and keeping that voltage constant.  You can do 
this with OP amps.  You can also obtain 3 
terminal parts called current mirrors.  The 
current through one input of the current 
mirror is a multiple of the current through 
the other side.

Quite a bit of the decision to design a particular 
constant current source is based on the amount 
of current you want to deliver.  I can answer 
more fully if you give me more details.


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