Engine sound and car horn simulator. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Engine sound and car horn simulator. Encyclopedia of radio electronics and electrical engineering

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

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Another version of the electronic imitator - it allows you to simulate the rumble of a running internal combustion engine and a horn tone. Such a universal device will help to "come alive" various toys, models and models of machines and mechanisms, such as cars, motorcycles, tractors, diesel locomotives.

The basis of the device is an asymmetric multivibrator assembled on transistors VT1 and VT2 of a phase structure (Fig. 1). It was possible to expand the capabilities of the simulator through the use of two separate frequency-dependent circuits with different time constants, switched by a push-button switch SB1. Turn on the device with the toggle switch SA1, applying the voltage of the battery GB1.

In the SB1 position shown in the diagram, the oscillation frequency of the multivibrator is determined by the parameters of the timing circuit R1R3C1 connected to the base of the transistor VT1. The generator works in the metronome mode, generating periodically repeating impulses with significant pauses between them - the "motor" is working. Its sounds are reproduced by the dynamic head BA1, connected through the transformer T1, which serves as the collector load of the transistor VT2. The frequency of "exhaust" is regulated by a variable resistor R1. In the upper position of its engine according to the scheme, "exhausts" are rare. By moving the engine to the lower position, the resistance of the resistor is reduced - the "motor" adds speed, the speed increases.

Engine sound and car horn simulator
Fig. 1

If you need to give an audible tone, press the SB1 button, and another circuit R1C2R2 will be connected to the base of the transistor VT4, which converts the device into an audio frequency generator. The duration of the beep depends on the time the button is pressed.

In a real mechanism, say, in a car, a loud horn drowns out the noise of a running engine, this circumstance is also taken into account in the simulator - once the button is released, the signals switch and the noise of a running "motor" is heard. When the "engine" needs to be "switched off", its "revs" are reduced to a minimum, and then the power is turned off - the "motor" stops working, but not immediately. One or three more cycles of "idling" are heard with decreasing volume, which is due to the energy stored by capacitor C3.

About the details. Low-power silicon transistors: VT1 (npn) of any series KT201, KT301, KT306, KT312, KT315, KT342, KT373; VT2 (pnp) - any KT208, KT209, KT351, KT352, KT361 series. Fixed resistors MLT-0,125-MLT-0,5; variable resistor of any type, preferably group A. Oxide capacitors K50-3, K50-6; C2 - paper, metal paper or ceramic (BM, MBM, KLS).

Transformer - output, from any transistor radio. Only one half of the primary winding, which has a middle output, is used. Dynamic head - with a power of 0,1-2 W and with a voice coil DC resistance of 6 - 10 ohms. SA1 - toggle switch of any type, for example P1T-1-1, MT-1; SB1 - self-return button type KM1-1, KMD1-1 or self-made based on the MP microswitch, as well as P2K without a latch. GB1 battery 3336L ("Ruby") or three series-connected elements 343, 373.

A device assembled without errors using serviceable elements begins to function immediately. But since the maximum and minimum engine speeds are different for different machines, the capacitance of the capacitor C1 should be selected within 1-5 microfarads. The tone of the signal is determined mainly by the capacitance of the capacitor C2, which ranges from 0,033 to 0,25 microfarads, and the volume (and within a small range of tone) is set by selecting the value of the resistor R4, thereby changing the duty cycle of the audio frequency pulses. To get more deaf "exhausts", the winding I is shunted with a capacitor with a capacity of 0,047 microfarads.

Sometimes the "motor" speed controller (resistor R1) is combined with a power switch. In this case, we recommend using a variable resistor with a switch - TK, TKD or SP3-106.

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

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