Noise generator: principle of operation and scope

With the help of electronic circuits today you can realize the most daring ideas. A novice radio amateur is able to collect even such an "exotic" device as a noise generator. This device is manufactured on an industrial scale and is designed to protect against information leakage from working radio electronic devices: computers, mobile phones, etc. They are often called "jammers" because of the ability to suppress any information signal that falls within the scope of their action.

The use of the device is advisable in offices or laboratories, in general, wherever there is a special regime of secrecy. If in any organization there is a ban on the use of mobile communication, then the noise generator is able to block any signal and prevent negotiations. In addition, you can create a device that will generate a so-called "white noise". This is noise of the audio range, which can prevent information leakage during meetings or especially important negotiations. The room is "enveloped in white noise".

In addition to the above examples, the noise generator can be used for other purposes. Probably, many remember the slot machine "Battleship", in which it was necessary to destroy the ship with the help of a torpedo. When hit the target included a noise generator that worked in the sound range and simulated the sound of the explosion.

Such a device is easy to construct if you know the principle of its operation. The device operating in the audio range generates audio frequency signals equal in amplitude. The peculiarity of the device is that at the output there is simultaneously a mixed signal. It can be generated, say, on a microprocessor, accurately dividing the audio range and mixing the signals with a certain discreteness. But it is much easier to use electronic instruments as a source of white noise: radio tubes or a zener diode. Such devices are easy to find in specialized stores. The noise generator on the zener diode consists of a parametric stabilizer. The signal is removed directly from the zener diode and delivered to the operational amplifier with a certain cutoff frequency. The white noise allocated in this way remains to be amplified by means of ultrasonic noise and transmitted to the speaker. The device works steadily in a wide range Temperatures and begins to generate a mixed frequency signal immediately after installation and connection to the power supply. It's pretty interesting to hear how the Zener works.

Finished instruments can also be purchased in stores. As an example, you can consider the noise generator GSh-1000M. The device is compact, and its radius of action is 40 square meters. It reliably protects the organization from possible information leakage from working computers. It is also possible to use several such devices, for example, to protect powerful computing centers or terminals. In this case, the instruments can be placed at a distance of 20 m from each other. The radiation generated by the generator does not exceed the permissible standards and does not harm the health of the staff.