Simple Audio Mixer Circuit Diagram. Audio mixing is normally performed by a mixer with virtual ground in which the various input signals are applied through series resistors to virtual ground that at the inverting input of operational amplifier. Download the schematic diagram simple mixer 4 inputs circuit in pdf document.
Audio taper potensiometers are possibly much better but linear will do the job. The simple audio mixer circuit is built on common base principle where input voltages are transformed in alternative currents wich are summed to form the alternative current component for the collector. The two internal amplifiers share a common bias network and power supply.
The power supply and audio power amplifier circuits are shown in figs 3 and 4 respectively.
Audio mixing is normally performed by a mixer with virtual ground in which the various input signals are applied through series resistors to virtual ground that at the inverting input of operational amplifier. Passive tone control circuit this is a simple tone control circuit that you can make with components available at your hand. For the op amps choose a jfet input dual or singles such as from the national semi lf3xx series or something such as the tl072 or tl082. Audio taper potensiometers are possibly much better but linear will do the job.
