Radio constructor. Sound effects simulators.
Radio and electrical constructors, sets.Generators, calibrators, testers ...Radio constructor. Sound effects simulators have been in production since 1982. The set, developed by the Central Design Bureau of Industry and Technology in Vinnitsa, was mastered in production by one of the factories in the Lviv region. It includes 3 printed circuit boards, 22 transistors, 17 capacitors, 34 resistors, a 0.2.5GD-19 head, a KM-1-1 button and an assembly wire. What simulators can be assembled from the kit? There are 4. The first is a single-tone siren, representing an asymmetric multivibrator on 2 transistors of different structures, loaded onto a dynamic head. The next one is a siren with a changing key. It is obtained by adding a bias voltage of one of the transistors to the first siren of the delay chain. When the chain is turned on with the button, the sound frequency increases smoothly, and when the button is turned off, it decreases smoothly. The devices are mounted on a single board. The second board is designed to accommodate parts of a two-tone siren consisting of 2 generators; a tone generator and a symmetrical multivibrator that smoothly changes the tone generator frequency within 800 ... 1500 Hz (the multivibrator frequency is selected to be 0.5 Hz). On the 3rd board, a bird song simulator is mounted. The basis is a tone generator made according to the scheme of a symmetrical multivibrator (oscillation frequency 1000 ... 1500 Hz). To obtain a complex signal reminiscent of birdsong, the oscillations of the generator are modulated by four multivibrators, and the fifth is used by a timer, limiting the duration of the trill and pause. Power supply from 9 V, current consumption ~ 40 mA. The price of a set is 12 rubles.