Abstract: An improvement in a constant current circuit comprising a metal oxide semi-conductor field effect transistor (MOSFET) integrated circuit (IC) for providing a feedback voltage indicative of current flow as a control parameter for either on-off mode or linear feedback mode. The improvement comprises the usual drain, gate and source terminals with an additional feedback terminal and dual, parallel connected FET's formed into the MOSFET IC and connected in parallel to the drain and gate terminals. One of the FET's is much larger and has a much greater current carrying capability than the second one and the second one is connected serially with a resistor, the juncture of the second field effect transistor and resistor being connected with the feedback terminal to give a voltage indicative of current flow at the drain terminal.