Audio mixing is the process of combining multiple audio channels into one or more audio channels. In this process source signals, frequency content, dynamics, level and panoramic position are manipulated. This audio mixing process is used in sound recording in order to produce the output which is more appeal to listeners. This audio mixing is also done in studios in order to produce album or single. Generally audio mixing process is carried out by the mixing engineer. Currently artists and engineers are using PC (personal computer) for audio mixing. This article describes you how to design a multi channel audio mixer using lm3900 quad amplifier. This audio mixing circuit has 2 MIC inputs and 2 line inputs. If you want to increase the input channels according to the application then add same circuit in parallel with the existing circuit. Before going to know about this circuit, get an idea about
Circuit Diagram of Multi Channel Audio Mixer using LM3900:
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