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The circuit uses 3 DY336 low noise, high quality op amps. Among them A1 is used as the buffer follower of the input signal, in order to reduce the burden of the signal source. A2 and RPl form a negative feedback volume regulator. This volume adjustment method can reduce the distortion and noise caused by the change in RPl resistance. Compared with the conventional volume adjustment, the transient distortion is smaller due to the lack of integral effects caused by the RC constant. A3 and VTl and VT2 form an output stage, which works in a single-ended Class A state. Its single-ended output contains even-order harmonics, which makes the sound quality better, and the current drive of the transistor output is strong, and the low-frequency control when matched with the rear stage Force will also be more ideal. As shown in the figure, the circuit is one of the amplifier circuits in the front stage of the power amplifier (the other is the same)
The audio pre-amplifier circuit provides switching signals, volume adjustment, buffering, etc. for the audio, and can add about 10 times the voltage amplification to make the audio have better sound quality.