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The simple mixer schematic 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 total amplification is R6 / Ri, where Ri is one of the input resistors. I’ve build this mixer for a little transmitter and works great.
The simplest audio mixer circuit diagram on the net. It has only one transistor and can support as many audio signal as you can afford. BC109C is a very cheap transistor and with a few resistors and capacitors you can build quickly a mixer circuit diagram that you can use in your pirate radio or wherever you want, imagination is the final frontier. Please keep in mind not to use higher voltages than 22V as a power supply for this audio mixer.
This FET mixer is an example of FET’s versatility. FETs are originally designed for high frequency applications but they can be used for audio frequencies and in fact they perform excellently in this area.
This mixer needs only four FETs and performs very well (actually you cannot expect a high quality mixer).
The audio mixer schematic we propose is developed arround 4 amplifiers build inside SSM2024 produced by Precision Monolithics Inc. (PMI) and is voltage controlled (VR).
The maximum VR voltage is 5.5V. The signal/noise ratio is 90dB and 130Khz band wide. This 4 channels mixer works great at +- 15V but you can use voltages between 9V and 18V.
