Improvement and Application of a Common Precision Constant Current Source

The common constant current source circuit structured by TL431 and transistor has many advantages such as tiny temperature coefficient,precisie current and so on.But the supply voltage of this constant current source change will affect the size of the output current,and the load change will affect the size of the output current too.This article clever uses 7805 and 2N7000 to improve the TL431-constant current source.The superior performance of the improved current source has been verifed from the perspective of simulation and experiments.The improved constant current source circuit has applied practically.