Mini Audio Mixer Circuit Diagram

The two internal amplifiers share a common bias network and power supply.

Mini audio mixer circuit diagram. Block diagram of the audio mixer with bass treble volume and balance controls. The output is provided across a 22uf capacitor. If all input resistors r1 r2. You are left with a two channel stereo mixer.

Vo a1 v1 a2 v2 a3 v3 an vn ax is the voltage gain for the xth input and it is equal to rf rx. This is the simple and low cost 3 channels mini audio mixer circuit diagram. Featured 3 inputs with switchable high low sensitivity and unusual level control circuits giving low noise figures and high overload margins proportional to gain level settings. This is the circuit diagram of simple and low cost mini audio mixer.

This circuit supplied using 9v power supply. The ic has short circuit protection and wide common mode and differential voltage ranges. Set the ac voltage amplification factor through the ration of r2 r1. The emitter is connected with gnd and the collector is connected with a 3 9k resistor.

The other components are connected across the base of the transistor. The power supply and audio power amplifier circuits are shown in figs 3 and 4 respectively. The audio mixing circuit alone is a very simple summing amplifier. Rn and also the feedback resistor rf have the same value then the voltage gain for each input channel becomes equal to the unity and the formula becomes.

Here dual operational amplifier ic 747 ic3 is used for mixing several inputs without any mutual interaction. To set the amplifier gain correctly choose the value of r4 2r2 double the value of r2. The three boxes that look like strange renderings of potted flowers are actually audio jacks with their barrels connected to ground. This circuit consume low current due to the simple design.

There are high low sensitivity switchable inputs for each input channel and each channel used low noise and high gain transistor of bc550c. In designing this mini audio mixer circuit diagram you can freely choose the value of the resistor r2 100k in the mixer schematic. A music generator ic is used to produce high frequency musical sound which will be then mixed with the audio mixing circuit. The right channels can be mixed in identical fashion.

Also featuring three inputs with switchable high low sensitivity and unusual level control circuits providing high overload margins and low noise figures proportional to gain level settings. This audio mixer circuit uses two stage amplifiers with a microphone to capture and amplify the bass beats played on an external device so that it should have enough loudness when mixing with other sounds.