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Radio constructor.
Sound effect simulators have been produced since 1982.
The set developed by TsKBIT in Vinnitsa, mastered one of the plants in the Lviv region in production.
It includes 3 printed circuit boards, 22 transistors, 17 capacitors, 34 resistors, a 0.2.5GD-19 head, a KM-1-1 button, and a mounting wire.
What simulators can be assembled from a set?
There are 4. The first one is a single-tone siren, representing an asymmetric multivibrator with 2 transistors of different structures loaded on a dynamic head.
The next is a siren with varying keys.
It is obtained by adding to the first siren the bias circuit of the bias voltage of one of the transistors.
When you turn on the chain with the button, the sound frequency gradually increases, and when you turn off the button, it gradually decreases.
Devices are mounted on one board.
The second board is designed to accommodate the details 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 (multivibrator frequency selected 0.5 Hz).
On the 3rd board, a device for simulating birdsong is mounted.
The basis is a tonal generator made according to the scheme of a symmetric multivibrator (oscillation frequency 1000 ... 1500 Hz).
To obtain a complex signal, reminiscent of birdsong, oscillations of the generator are modulated by four multivibrators and the fifth is used by a timer, limiting the duration of trills and pauses.
Power supply from 9 V, current consumption ~ 40 mA. Set price 12 rubles.