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The set of radio amateurs "Electronics Integral-1" since the beginning of 1988 has been producing the Tomsk Research Institute of Semiconductor Devices. The set of radio amateurs "Electronics Integral-1" is intended for radio amateurs who have basic knowledge of radio engineering and contains components and parts from which a powerful end audio amplifier can be assembled using the above diagrams. Main technical data: Rated output power 50 watts. The nominal band of amplified sound frequencies is 20 ... 20000 Hz. The sensitivity of the amplifier is 0.5 V. The harmonic factor is 0.5%. Input impedance is 10 kΩ. The finished design requires a housing, an appropriate radiator and a powerful power source.