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μPC1353C是带有低放输出级的电视机伴音中放、低放集成电路.(一)组成和特点:μPC1353C由伴音中放、差分峰值调频检波、直流(DC)可变式音量调节、声音输出电路等部分组成,其内部结构方框图见图1,内部电路以及外围电路见图7.在这块集成电路中,采用直流音量控制,其控制范围可达80分贝以上.在伴音输出级的集电极所联接的电源中纹波较大,所以采用后面要讲的纹波消除电路.(二)伴音中放、限幅放大器及低通滤波器:这部分由Q_1～Q_(10),D_1～D_3,R_1～R_(14),C_1以及外围元件T_1,(13)脚上的电容器0.022微法组成.伴音中频信号注入(12)、(13)脚,但(13)脚是交流零电位,Q_1的直流偏置由(13)脚供给.如果不用中周T_1而用陶瓷滤
μPC1353C is a low-output amplifier with low-output audio amplifier, low-lying integrated circuit. (A) Composition and features: μPC1353C by the audio amplifier, differential peak FM detection, DC variable volume control, Circuit and other components, the internal structure of the block diagram shown in Figure 1, the internal circuits and peripheral circuits shown in Figure 7. In this integrated circuit, the use of DC volume control, the control range up to 80 dB above the output stage of the collector The connected ripple in the power supply is larger, so the ripple cancellation circuit to be discussed later is used. (2) Audio amplifier, limiting amplifier and low-pass filter: This part consists of Q_1 ~ Q_ (10), D_1 ~ D_3 , R_1 ~ R_ (14), C_1 and 0.022 μF of capacitors on the peripheral components T_1, (13) .Audio intermediate frequency signal is injected into the feet of (12) The DC bias is supplied by pin 13. If not use the middle of the week T_1 with ceramic filter