Abstract: An power-saving amplifying device is disclosed, the power-saving amplifying device uses a micro controller unit (MCU) to receive a control signal transmitted by a volume controller and to generate a decision signal based on the control signal; the MCU transmits the decision signal to the volume controlling circuit for obtaining a drive signal, then the volume controlling circuit transmits the drive signal to a power amplifier for driving a speaker to output a sound with a required volume; the MCU also calculates an output value of a PWM signal and transmits the PWM signal to a DC integrating circuit for rectifying and integrating the PWM signal into a DC voltage; the DC voltage is coupled with a voltage control terminal of the power supply to increase or decrease the DC voltage outputted by the power supply to the power amplifier, thereby reducing power consumption by using the volume to control the output voltage of the power supply.

Abstract: An power-saving amplifying device is disclosed, the power-saving amplifying device uses a micro controller unit (MCU) to receive a control signal transmitted by a volume controller and to generate a decision signal based on the control signal; the MCU transmits the decision signal to the volume controlling circuit for obtaining a drive signal, then the volume controlling circuit transmits the drive signal to a power amplifier for driving a speaker to output a sound with a required volume; the MCU also calculates an output value of a PWM signal and transmits the PWM signal to a DC integrating circuit for rectifying and integrating the PWM signal into a DC voltage; the DC voltage is coupled with a voltage control terminal of the power supply to increase or decrease the DC voltage outputted by the power supply to the power amplifier, thereby reducing power consumption by using the volume to control the output voltage of the power supply.