Simple stereo mixer. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Musician
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For school discos and recording enthusiasts, the Funkamateur magazine offers a five-channel stereo mixer circuit (Fig. 1). It is designed to connect two stereo players (X1, X2), two stereo tape recorders (X3, X4) and one microphone (X5) for a soloist or program host.
The design is simplified as much as possible due to the use of unified circuit solutions, blocks and parts. Preamplifiers V1-V10 are made on three transistors V1-V3 according to the same circuit (Fig. 2).
In the first stages, low-noise semiconductor triodes are installed, for example, the KT306 or KT3102 series. The channel gain is set with trimmers R2, R7, R42, and the levels are smoothly adjusted with potentiometers R4, R9, R44.
Input X1-X4 and output X6 jacks are five-pin, and microphone jack X5 is three-pin. The device is powered by six 1,5 V dry cells shunted with a capacitor with a capacity of at least 220 μF (Fig. 3).
The remote control is assembled in a small metal case with an inclined front panel and has dimensions of 240X160X110 (40) mm.
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