Surf noise simulator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Calls and audio simulators
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The simulator is made in the form of a set-top box connected to an audio frequency amplifier. The source of the noise signal is a silicon zener diode V1, operating in the avalanche breakdown mode with a small reverse current. On transistors V2-V4, an amplifier with a variable gain is made, which serves to amplify the noise signal.
(click to enlarge)
The change in the gain is made by the transistor V5, included in the emitter circuit of the transistor V4, by applying a control voltage to the base V5 through the integrating circuit R8C4. This voltage is generated by a symmetrical multivibrator on transistors V6 and V7. Thus, at the output, the noise signal will periodically rise and fall, simulating the sound of the surf. High-impedance headphones can be connected to the "Output" jacks.
The simulator uses transistors of the KT351D type.
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