The different sounds in songs like the sound of the guitar, drums, the voice of the singer etc. are recorded as separate tracks using separate microphones. More than 10 numbers of tracks are very common in normal quality songs. The audio mixer circuits find its applications in both recording and playback side. When recording a song the audio mixer circuits are used to mix two or more different sounds into a single track. The audio mixer devices used by the DJs for playing songs are familiar to most of the people.
Fig. 3: Circuit Diagram of Single Transistor Based Amplifier
Music Generator, Summing Amplifier