Circuit diagram of transistor audio amplifier with DC coupling

As shown in the figure, this circuit uses an A1 (CA3100) integrated circuit as the input stage, while the power amplifier stage uses a separate transistor, which is actually two cascaded amplifier modules with a common feedback loop. The column amplification module is composed of R17, R10 and C8 to form its own local feedback. The input stage of the split section is a common base VT12, VT13 (Q12, Q13) circuit. This stage is used as a voltage converter and works in class A. The next stage VT1, VT2 (Q1, Q2) also works in class A And its main function is voltage amplification.

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