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The radio constructor "Start-7240" (2x2 W low-frequency amplifier) "‹"‹was manufactured by the Kamenets-Podolsky plant Elektropribor in the I quarter of 1989. The radio constructor allows you to assemble a stereo power amplifier used in portable or stationary equipment with a supply voltage of 6 ... 15 V. The amplifier contains a minimum of parts, is simple to manufacture, does not require adjustment. The circuit consists of two identical channels, each of which is assembled on an integrated chip K174UN7. As a load, you can use loudspeakers with a resistance of 4 ... 8 Ohms and the corresponding power. Main characteristics: Frequency range - 40 ... 20000 Hz. The rated input voltage is 250 mV. Rated output power at a load of 4 ohms at a supply voltage of 12 V 2x2 W, maximum 2x4 W. The harmonic coefficient at a frequency of 1 kHz, no more than 1%. Supply voltage 6 ... 15 V. Current consumption in the absence of a signal is not more than 40 mA. Dimensions of the board 167x92x45 mm. Macca 200 g