Engine sound simulator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Calls and audio simulators
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A "voiced" model of a tractor, car or locomotive immediately "comes to life" if you equip it with an electronic sound simulator. A diagram of a device that imitates the "voice" of an internal combustion engine was published by the Yugoslav magazine Radioamater.
The simulator is based on one of the many variants of the LC generator based on two transistors of different types of conductivity. The oscillation frequency is regulated by a variable resistor R1. If the "motor" increases speed, respectively increase the frequency of the generator, reducing the resistance R1.
The DC mode of both transistors is set by selecting the resistances of resistors R1 and H19. The voltage on the collectors VT1 and VT2 should be approximately half the supply voltage.
In the equalizer, you can use any low-power silicon transistors KT3102, KT342, KT315, KT312, KT306 with any letter indices.
When using slider-type potentiometers, it is easy to imagine the shape of the frequency response of the equalizer by the position of the knobs - in this case it is called "graphic".
The device can use pairs of any low-power transistors KT306, KT312, KT315 (V1) and KT208, KT209, KT361, KT814 (V2) with any letter indices. Output transformer and dynamic head - from any transistor radio. Food - battery 3336L.
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