Siren simulator. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Calls and audio simulators

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An electronic simulator, the schematic diagram of which is shown in fig. 1, mimics the sound of a siren. The device consists of two identical audio frequency generators assembled on transistors VT1, VT2 and VT3, VT4 of different structures according to the asymmetric multivibrator circuit.

As a result of the interaction of acoustic vibrations close in frequency, emitted by the dynamic heads BA1 and BA2, working as a "duet", the nature of the sound differs sharply from the usual tone signal emitted by one head. The sound acquires an unusual pleasant coloring, becomes saturated, colorful, enriched with overtones. When the heads are placed at some distance from each other, an effect close to stereophonic is observed.

The positive feedback circuit is made up of resistor R3 (R6) and capacitor C1 (C2). The parameters of these elements determine the main operating frequency of generation, as well as the volume of the sound reproduced by the dynamic head BA1 (BA2), which is the load of the generator. The divider of resistors R1 (R4) and R2 (R5) creates the necessary bias voltage based on VT1 (VT3), which determines the mode of operation for direct and alternating current of each pair of interconnected transistors.

To exclude the influence of the generators on each other due to galvanic coupling, each is equipped with an autonomous power supply G1 and G2. Turn on the simulator with the double button SB1.

Fig. 1

Any transistors of the series KT201, KT301, KT306, KT312, KT315, KT342, KT373 (npn) and MP13-MP16, MP20, MP25, MP26, MP39 - MP42 (pnp) with a base current transfer coefficient of at least 30 can be used in the device. MLT-0,125 or MLT-0,5, capacitors MBM, KM and others. Dynamic heads with a power of 0,1-2 W, with a voice coil DC resistance of 4 - 16 ohms. Instead, you can use electromagnetic telephone capsules with a coil resistance to direct current of 30-200 ohms (for example, DEMSH-1, DEM-4m, TM-2A). In this case, the resistance of resistors R1, R4 should be increased. Pushbutton switch type KM2-1. Power - elements 332, 343 or 373.

Establishment comes down to serial tuning of generators. First, the power source is connected to the first of them and by selecting the resistance of the resistor R2, the highest volume of the sound signal is achieved. Then the same operation is repeated for the second generator. After that, both generators are turned on at once and their joint action is listened to, experimentally determining the best relative position of the heads (in a real design). The operating frequency of the generators is selected by changing the capacitance of the capacitors C1, C2 within 0,033-0,25 μF. If their values ​​differ, the character of the sound will be different, but interesting in its own way.

Author: E. Savitsky, Korosten, Zhytomyr region; Publication: cxem.net

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