A simple microphone mixer. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Audio equipment
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In the process of recording and sounding rooms, it is sometimes necessary to amplify and mix signals from several microphones. Such a device can be made independently within one evening, using available and inexpensive parts.
The mixer circuit (Fig. 1) is very simple.
The DA1.1 operational amplifier is connected according to the adder circuit with level controls for each input. The number of inputs can be increased or decreased as needed. The amplified signal goes to a simple passive tone control. Its frequency response is shown in Fig. 2.
After the tone control, the signal is fed to the buffer follower on the op-amp DA1.2, and from its output to the line input of an amplifier or tape recorder with a sensitivity of 150 ... 350 mV.
Almost any type of part can be used in the mixer. Due to the simplicity of the device, surface mounting or mounting on a prototyping board can be used. Level regulators R4-R6 are best used with a logarithmic dependence of resistance on the angle of rotation of the engine, for example, SP2-6. Variable resistors with a linear dependence, such as SP2-5, are suitable for the tone control. When constantly working with the same microphones, you can limit yourself to trimming resistors "under the slot". OU K157UD2 can be replaced by any other with the appropriate correction circuits, and both dual and separate ones are suitable. The mixer is powered by two "Korund" batteries.
Author: A. Shikhatov, Moscow
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