Noise noise strife, there is one under which it is good to dream. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Noise noise strife, there is one under which it is good to dream. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Electronics in medicine

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Nothing restores strength and nervous system like healthy sleep. In our stressful times, many suffer from insomnia and resort to chemical psychotropic drugs. But it's dangerous. Negative side effects may occur. But modern medicine very successfully uses electronic devices that have a beneficial effect on the body and are completely harmless. In patients who have undergone electrosleep treatment, their well-being improves, fatigue disappears, and vital activity increases.

Electrosleep devices are usually of two types. In one case, this is a miniature noise generator, similar in character to the murmur of a stream or rain. The device located behind the ear muffles extraneous noise and has a calming effect on the nervous system. The second type is an electronic sleeper in the literal sense of the word. It acts on the body with selected current pulses. Sleeping agents are resorted to only on the recommendation of a doctor and are used under his supervision. Therefore, we recommend making an apparatus of the first type for home conditions.

A small console will allow you to go to bed with the help of a tape recorder, radio or TV to the sound of the surf.

The prefix (Fig. 1) consists of a noise generator (transistor VT1 and a zener diode VD1), an emitter follower VT2, a variable gain stage VT3, VT4 and a control voltage generator VT5, VT6. The source of the noise signal is a silicon zener diode VD1, operating in the so-called avalanche breakdown mode with a small reverse current. To change the gain of the cascade on the transistor VT3, a transistor VT4 is included in its emitter circuit, the base of which receives a signal from the control voltage generator through the resistor R7 and the integrating circuit R8, C4. It is a symmetrical multivibrator on transistors VT5, VT6. Periodically changing resistance between the collector and emitter of the transistor VT4 causes a corresponding change in the gain of the cascade on the transistor VT3. As a result, the noise signal at the output will periodically rise and fall, simulating the sound of the surf.

Noise noise strife, there is one under which it is good to dream
Rice. 1. Schematic diagram of the electrosleep apparatus

The duration of rise and fall of the control voltage can be changed by selecting resistors R8, R10, R11 and capacitor C4.

The details of the prefix are mounted on a board made of foil-coated getinax with dimensions of 70-55 mm. Any stabilized power supply with a voltage of 22 ... 25V can serve as a power source.

Setting up a prefix is usually not required. It is ready to work immediately after connecting the power supply. And you can check its performance using TON-2 headphones (or other similar ones) included in the X1 "Output" sockets. The nature of the sound of the surf is changed by selecting the supply voltage, as well as by shunting the sockets X1 with a capacitor C7 with a capacity of 1000 - 3000 pF.

Enjoy your dreams!

Author: V.Tsibulsky

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