POWER SUPPLY CIRCUIT

PROBLEM TO BE SOLVED: To provide a power supply circuit capable of suppressing consumption of unneeded current even when feeding operating voltage to a plurality of loads with different amounts of needed current at the time of operation. SOLUTION: When feeding operating voltage to only a receiver 3 whose current amount to be required at the time of operation is relatively small, the power circuit 20 turns on a transistor 24 and drives a power transistor 21 through a bias resistor 25 having a high resistance value by lowbase current. Then, current to be consumed in the power circuit 20 can be reduced while feeding necessary and sufficient current to a receiver 3. COPYRIGHT: (C)2006,JPO&NCIPI