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该微型调音台可用于家用声象设备音频输入的端口扩展,如卡拉OK、摄象机、录象机及录音机;也可用于各种音频节目的复制。该微型调音台有两路线路输入(BU2、BU3)和一路话筒输入(BU1),各路信号的音量可分别调整。并可通过耳机监听混合后的输出信号,监听音量也可单独调整。简易微型调音台电路如图1所示。音频信号通过插座BU2、BU3输入,经隔直流电容C5和C6分别送到音量调整电阻R6和R7。话筒信号通过插座BU1输入,经耦合电容器C2送到运算放大器IC1A的正输入端(③脚)。由于IC1仅用一正电压供电,故必须使运放的正输入端通过R4接到经分压电阻R1和R2得到的1/2供电电压上。电路的输入电阻可通过R4调整。在本电
The mini-mixer can be used for port expansion of audio inputs for home audio equipment such as karaoke, video cameras, video recorders and recorders; it can also be used for the reproduction of various audio programs. The mini-mixer has two line inputs (BU2, BU3) and one mic input (BU1). The volume of each signal can be adjusted separately. And through the headphones monitor the mixed output signal, the monitor volume can also be adjusted separately. Simple mini mixer circuit shown in Figure 1. The audio signal is input through the jacks BU2 and BU3, and sent to the volume adjusting resistors R6 and R7 via the DC blocking capacitors C5 and C6, respectively. Microphone signal input through the socket BU1, through the coupling capacitor C2 to the positive input of the op amp IC1A (③ feet). Since IC1 is powered by only a positive voltage, the positive input of the op amp must be connected via R4 to the 1/2 supply voltage across the divider resistors R1 and R2. The input resistance of the circuit can be adjusted by R4. In this electricity