The design of program-controlled constant-current source circuit is introduced.The principle is that the controllable voltage which is generated by microcomputer’s timer outputting pulse-width signal is applied to control the constant-current source to produce controllable current.Current output is set by microcomputer’s interface key.Current output is regulated continuously and current is measured dynamically.This program-controlled constant-current source circuit is used to design the gas sensor sintering and aging equipment

which can guarantee the quality of the gas sensor.