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二、末级功放配合前级电路的五路末级功放均采用大功率放大集成电路,大大简化了电路,其电路如图1所示。图中R、L主声道采用飞利浦公司TDA7294。当±38V供电、负载阻抗为8Ω时,有效输出功率达70W。由于主声道功放为全频功率放大,因此两路放大器输入回路的基准频率被C9(C16)、P1(P2)设置在15.4Hz。R5(R7)、C10(C17)组成具有频率校正特性的电流负反馈电路,上述元件按图示取值,使
Second, the final stage power amplifier with the previous stage of the last five-stage power amplifiers are used to amplify the high-power integrated circuits, greatly simplifying the circuit, the circuit shown in Figure 1. The figure R, L main channel using Philips TDA7294. When ± 38V power supply, the load impedance of 8Ω, the effective output power of 70W. Since the main channel amplifier is full-band power amplification, the reference frequency of the two-channel amplifier input circuit is set at 15.4 Hz by C9 (C16) and P1 (P2). R5 (R7), C10 (C17) form a current negative feedback circuit with frequency correction characteristics, the above components as shown in the figure so that