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The toy "Low Frequency Amplifier" since 1989 produced the Pavlodar plant "Spring". The ULF toy is intended for technical creativity of children of middle and senior school age who are familiar with the basics of radio electronics and for beginner radio amateurs. The toy is a modular unit that can be used to enhance the volume of the audio signal in amateur designs. Its rated output power is at least 0.25, the maximum power is 0.6 watts. Current consumption with no signal 10 mA. The maximum current consumption at a load of 8 ohms - 100 mA. Input impedance is 10 kΩ. The input voltage is 0.14 V. The dimensions of the amplifier are 40x07x30 mm. Weight 0.15 kg.