The designed power supply is conver

The designed power supply is converted to 25 v AC through a transformer, and gets 35 v DC through rectification and filtering. Then through the three-terminal integrated voltage-stabilized circuit output 24V, Supply pre-amplifier circuit and power amplifier use. The main function of the input stage is to suppress the zero drift, ensure the stability of the circuit, at the same time, the first stage tonal control stage of the signal sent low distortion, low noise amplification. For this purpose, a composite tube with a constant current source is used, and the static bias current is set to be Differential amplifier. The function of the push stage is to obtain a sufficiently high voltage magnification and to provide a sufficiently high drive current for the output stage. For this purpose, a collector active load co-emitter amplifier circuit is used, whose static bias current is larger than that of the input stage. The function of the output stage is to provide a large enough output signal power to the load. In addition, a Class B complementary symmetric amplifier or a quasi complementary amplifier with a composite tube can be used, aC negative feedback circuits shall be considered for stabilizing the Biasing, AC negative feedback circuits shall be considered for stabilizing the voltage amplification factor and improving the performance of the circuit, as well as overcurrent protection circuits. The circuit shall be designed with suitable Biasing at all levels, and shall be tested statically and dynamically after assembly to maximize the output power without distortion of the waveform. During dynamic testing, attention should be paid to eliminating vibration and connecting the fuse to prevent damage to the components. In addition, AC negative feedback circuits shall be considered for stabilizing the Biasing, AC negative feedback circuits shall be considered for stabilizing the voltage amplification factor and improving the performance of the circuit, as well as overcurrent protection circuits, etc. . The circuit shall be designed with suitable Biasing at all levels, and shall be tested statically and dynamically after assembly to maximize the output power without distortion of the waveform. During dynamic testing, attention should be paid to eliminating vibration and connecting the fuse to prevent damage to the components. The pre-amplifier circuit adopts low-noise dual operational amplifier, which is used as the signal amplification of left and right channels in the same way. The power amplifier circuit consists of three parts: input stage, push stage and output stage. The input stage is composed of two triode Differential amplifier, the push stage is composed of a triode, and the output stage is composed of two triode symmetry. The speaker is directly connected between the output terminal of the two output tubes and the ground. At the same time, the amplifier should be operated in a B state.