SIMPLE STEREOMIXER

For school discos and Amateur recording magazine “Funkamateur” (GDR) offers a scheme of five “anal stereomixer (Fig. 1). It is designed to connect two stereophonically (X1, x2), two stereos, (XS, X4) and one microphone (X5) for a soloist or a master program.

Construction is simplified through the use of standardized circuitry, blocks and parts. The preamps V1—V10 is made three transistors V1—V3 on the same diagram (Fig. 2). In the first stage installed a low-noise semiconductor transistors, such as series КТ306 or КТ3102. The gain of the channels set trimming resistors R2, R7, R42, and smooth adjustment of the levels produced by potentiometers R4, R9, R44.