2 0. Despite its ultra-compact size, the MICROMIX MX400 4-channel line mixer is really big on features Providing the highest sonic quality at all output levels.1 LM3900 integrated circuit (4 operational amplifiers) (U1).LM3900 Pinout (4 Operational Amplifiers) List of components for the 4-channel audio mixer These capacitors filter (block) the direct current component of the signals at the input and output, amplifying only the alternating signal (the audio signal). The outputs of the 4 channels are mixed after passing through 4 resistors of the same value (R11, R12, R13, R14)Īll operational amplifiers are configured as inverting amplifiers and have decoupling capacitors at their inputs and outputs. The potentiometers are used to control the volume of the input signals. Each potentiometer controls the audio level of each channel before amplifying the signal and performing the audio mix. Four channels means that we will use 4 potentiometers (P1, P2, P3, P4), placed at the inverting input of each amplifier. The amplification (gain) of each channel is controlled with 1 potentiometer.
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