Description: This design USES is composed NE5532 chip preamplifier circuit will input sine signal amplifier, realize the load power output is equal or greater than 5 W requirements. Through the division of MOS tube complementary amplifier circuit, enhance power amplifier and drive ability to drive eight Ω load. The power amplifier output power, power supply rate through the STC89C52 SCM in the A/D converter sampling calculation, and get the whole machine efficiency, and displayed on the LCD display. The band elimination filter circuit can reduce the ac power to the influence of the amplifier. The design of the system realized the output power range in 10 Hz ac-50 KHz, power is greater than 5 W analog signals, and the error within 5 and the signal no significant distortion.
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