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Radio constructor. Sound effects simulators have been produced since 1982. The set developed by TsKBIT in Vinnytsia, mastered the production of one of the plants in the Lviv region. It consists of 3 printed circuit boards, 22 transistors, 17 capacitors, 34 resistors, a 0.2.5GD-19 head, a KM-1-1 button and an installation wire. What simulators can be assembled from a set? Their 4. The first is a single-tone siren representing an asymmetrical multivibrator on 2 transistors of different structure, loaded onto a dynamic head. The next one is a siren with varying pitch. It is obtained by adding to the first siren a delay circuit of the bias voltage of one of the transistors. When you turn on the chain with a button, the frequency of the sound gradually increases, and when you turn off the button, it gradually decreases. Devices mounted on a single board. The second board is designed to accommodate parts of a two-tone siren, consisting of 2 generators; tone generator and symmetric multivibrator, smoothly changing the frequency of the tone generator within 800 ... 1500 Hz (the frequency of the multivibrator is 0.5 Hz). On the 3rd board, a bird singing simulator device is mounted. The basis is a tone generator made according to the symmetric multivibrator circuit (oscillation frequency 1000 ... 1500 Hz). To obtain a complex signal resembling the singing of birds, the oscillations of the generator are modulated by four multivibrators, and the fifth is used by the timer, limiting the duration of the trill and pause. Power supply from 9 V, consumed current ~ 40 mA. Set price is 12 rubles.