Design of voice amplifier circuit 1. Design tasks and requirements Design a low-frequency power amplifier with weak signal amplification capability and simulate it with Multisim7. The schematic diagram is as follows: Requirements: When the voltage amplitude of the sinusoidal signal input is 5~100mV and the equivalent load RL=8Ω, the amplifier should meet the following requirements: (1) Rated output power POR≥5W; (2) Bandwidth fbw≥20~2000 Hz; (3) Nonlinear distortion coefficient ≤3% under POR and within fbw; (4) When the input end of the preamplifier stage is short-circuited, the AC sound power on RL is ≤10mW. Square wave generation: The external sinusoidal signal is converted into a symmetrical square wave with positive and negative polarities: the frequency is 1000 Hz and the peak-to-peak voltage is 200mV. When the above square wave is input, the amplifier should meet the following requirements under the load RL=8Ω: Rated output power POR≥10W.
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