| 摘要 |
PROBLEM TO BE SOLVED: To obtain a power supply circuit whose power supply voltage variation can be reduced, and which can be reduced in size and cost and is suitable for an audio circuit or the like. SOLUTION: The power supply circuit is provided with a transistor 15 whose collector-emitter path is connected between a DC power 11 and a load 13, and whose base is grounded through a Zener diode 16, and a power supply voltage variation removal means provided between one end of the DC power 11 and a connection point of the base of the transistor 15 and the Zener diode 16, wherein the power supply voltage variation removal means has resistors 17, 18 connected in series between the one end of the DC power 11 and the connection point of the base of the transistor 15 and the Zener diode 16, and a capacitor 19 connected between the connection point of the resistors 17, 18 and the ground. The total value of the resistance value of the resistor 18 and a operating resistance 20 of the Zener diode 16 is set to a value equal to the resistance value of the resistor 17. COPYRIGHT: (C)2007,JPO&INPIT
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