We have tested four channel audio mixture in lab of BEP with three different input signals.Ĭheck out the other audio mixture circuit posted in bestengineeringprojects. This circuit is used as a high quality audio mixer.įor stereo effect, two different circuits can be used to obtain the desired output. As a result, the voltage in the output pin is equal to the total sum of every individual input signal. In the circuit four channel audio mixer, when two or more audio signals are fed in the input terminal, then the input circuit combines all input signals as one and connects the input pin of audio signals with inverting pin of the IC-741. Capacitor C 1 behaves as a blocking capacitor whereas variable resistor VR 1 as signal controller for channel 1. When a single audio signal is fed as input in the circuit, it starts working as an inverting amplifier, where R 1 and R 7 are combined for voltage gain. The IC 741 as previously mentioned works in inverting mode with extra resistor for every single input channel.
The circuit of four channel audio mixer is wired around op-amp IC 741 followed by few other active as well as passive components.
Circuit Description of four channel audio mixer:
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