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    50W power amplifier circuit composed of SAP15 ----- 50W Power Amplifier

     

    50W power amplifier circuit consisting of SAP15, 50W Power Amplifier Keywords: 50W amplifier circuit consisting of SAP15 50W amplifier circuit with SAP15 Author: Wu Jianguo This active uses the discrete component to serve as the input stage and driver level, and the output power reaches 50W. The input stage is held by VT1, VT2, which is fully symmetrical, which has a higher conversion rate than the general differential circuit, but the temperature stability is slightly in the differential circuit. VT3, VT4. The drum level is used to enlarge the input stage signal and drive the amplifier output stage composed of SAPL5n / P. The output stage uses a current driving method, and the negative feedback voltage is taken out on the sampling circuit in series of the speaker, and the negative feedback voltage is added to the actuator of the input tube, and the negative feedback voltage is proportional to the current of the electrical resistance R5, R9. The closed loop voltage gain of this unit is GV = R12 // RL / RL3 × (R5 + R6) / R6≈42.

     

     

     

     

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