| 摘要 |
PROBLEM TO BE SOLVED: To restrain power supply voltage fluctuations in the reduction and increasing properties of a PWM amplifier, without having to degrade the space factor. SOLUTION: In addition to a pull-type regulator consisting of a transistor, a current-limiting resistor, a capacitor, and a bias resistor, a positive power supply series regulator is connected to between power supply voltage and the PWM amplifier. It is thus possible to restrain power supply voltage fluctuations in the reduction and up increasing of the PWM amplifier and use a capacitor with small capacitance, thereby preventing the space factor from degrading. |
