Sound simulator for a shooting gallery. Encyclopedia of radio electronics and electrical engineering

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

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The shot of machine-gun bursts, the screech of mines, the heavy bass of land mines... A rather simple device, made on only three transistors, imitates such a sound picture of a battle.

As can be seen from the circuit diagram, the combat sound simulator consists of a self-excited pulse generator - a multivibrator based on transistors VT1 and VT2, an amplifier (VT3 semiconductor triode) and a dynamic head BA1. Moreover, users themselves choose sound effects by pressing certain control buttons.

To simplify the design, one common generator is used, the operating mode of which is changed by appropriate switching. In the "machine gun" mode, this multivibrator is powered directly from the GB1 battery through switches S4 (it turns on the simulator) and S1, which (thanks to contacts S1.2, S1.3) in parallel with capacitors C5, C7 connects relatively large electrical capacities C3 and C6 than a "queue" with a certain frequency of "shots" is provided. If desired, by adjusting the value of capacitors C3 and C6, you can change the frequency with which the "machine gun scribbles". The current value of the transistor VT3, indicated in the diagram, is set by selecting the resistor R5.

When simulating the passage of a mine, power is supplied from a pre-charged capacitor C1, when the movable contact of group S2.1 of the switch is transferred to the right position according to the scheme. At the same time, capacitor C2.2 is connected to the multivibrator arm by group S4. As the capacitor C1 discharges, the voltage on the multivibrator gradually decreases, while the generated frequency increases and a sound occurs that resembles the screech of a flying mine.

Schematic diagram of the device for imitating sounds (click to enlarge)

The organization of the power supply of the multivibrator in the "rocket" mode is similar - from the capacitor C2 through the switch S3. In this case, only capacitors C5 and C7 work in the arms of the multivibrator. A sound that starts at a low note gradually rises to a very high note and seems to disappear into the distance.

Imitation signals are amplified by a cascade on a transistor VT3, connected according to a common emitter circuit. Its load is the dynamic head BA1 in the collector circuit of the transformer T1.

The power source of the simulator is a "Korund" battery or two 3336 cells connected in series. It is possible to use a network unit (adapter). As switches S1-S3, it is better to use buttons or toggle switches with self-return to their original position. A knife-type range switch from a portable radio is also suitable as S1. An automatic return to the open state will be ensured here if the switch handle is provided with a coil spring.

The circuit board of the simulator is made of foil fiberglass. Corresponding oxide capacitors K50-6 or MBM (C4), KLS (C1-C3, C5-C8), resistors (all of them are of the MYAT type, with a power of not more than 0,5 W) and other elements of the fundamental electrical circuit.

Sound simulator circuit board

It is possible to replace used parts with their analogues. In particular, instead of the transistors indicated on the circuit diagram, others from the MP39-MP42A series, as well as (only all at once) MP35-MP38A of the npn structure, are suitable. But in the latter case, you will have to reverse the polarity of connecting the power supply and oxide capacitors.

Transformer T1 - output, from radio receivers of the "Selga-404" type. Dynamic head - 0,1 GD-8 or another having a voice coil resistance of 8-10 ohms.

The controls can be placed in the simulator case or in a remote control panel connected to the board with a bundle of flexible stranded wire in vinyl insulation. The dynamic head is mounted on the front panel of the case, where holes with a diameter of 2-3 mm are drilled for this (for fasteners and "sound" ones located opposite the diffuser).

A correctly assembled device starts working immediately after turning on the power supply.

Author: Yu.Prokoptsev

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