PURPOSE: To obtain an inexpensive, small-sized balanced feeding circuit for feeding a telephone set, by composing the feeding circuit only of a DC bias circuit with high resistance and a couple of current limiting circuits.

CONSTITUTION: A DC voltage source 1 supplies a 0V voltage to a terminal 1c, a positive voltage to a terminal 1a, and a negative voltage to a terminal 1b. The 1st and 2nd current limiting circuits 11 and 31 conduct constant currents without reference to voltage drops across the circuits. When a telephone set is connected between output terminals 2a and 2b, currents determined by the 1st and 2nd current limiting circuits 11 and 31 flow to the telephone set and a balance circuit 7. At this time, if a current difference is generated between the 1st and 2nd current limiting circuits 11 and 31, the difference current flows through the resistors 5a and 6a of the balance circuit 7 and the potentials at the output terminals 2a and 2b are held approximately at the voltage at the terminal 1c.