Abstract:

This paper describes the design of a programmable current source.The output of the programmable current source ranges from 200 mA to 2000 mA,and current frequency is 50 Hz.The keys can increase or decrease the value of current,and the step is 1mA.AT89C51 is used as controller outputs current control words to control the op amp and chip MAX539 is used for digital-analog conversion.The design has the advantages of high control precision and easy production.

Key words: programmable;current source;current control word