With the help of electronic circuits today you canrealize the most daring ideas. A novice radio amateur can even build such an "exotic" device as a noise generator. This device is produced 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.
Use of the device is advisable in offices orlaboratories, in general, wherever there should be a special regime of secrecy. If in any organization there is a ban on the use of mobile communications, then the noise generator is able to block any signal and prevent negotiations. In addition, you can create a device that will generate the so-called "white noise". This is noise of the sound range, which can prevent information leakage during meetings or especially important negotiations. Room at the same time "enveloped in white noise."
In addition to the above examples, the noise generatorcan be used for other purposes. Probably, many remember the slot machine "Sea Battle", 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 ifknow 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 devices 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 is given to an operational amplifier with a certain cutoff frequency. The white noise selected in this way remains to be amplified with the aid 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 interesting to hear how the Zener works.
Finished instruments can also be purchased instores. 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.
