Controllable supply voltage circuit for power amplifier

The utility model discloses a controllable supply voltage circuit for power amplifier, it contains a preamplification level, and be equipped with a preamplification ware and control circuit is strengthened to a bass of being connected with back coupling mode and this preamplification ware in this preamplification level, a power amplifier stage is equipped with an audio power output stage and a dynamic mains voltage change over switch in this power amplifier stage, this audio power output stage and preamplification level electric connection, and a less fixed mains voltage is connected to one of them input of these developments mains voltage change over switch, another input of dynamic mains voltage change over switch is connected to a supply voltage circuit for as preamplification level reinforcing bass audio signal the time, provide a dynamic mains voltage who is greater than this fixed power voltage to this power amplifier stage, therefore, the utility model discloses can realize the supper bass strengthenin