With the help of electronic circuits today you can realize the most daring ideas. A novice radio amateur can even assemble 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 electronic devices: computers, mobile phones, etc. They are also often referred to as “jammers” due to their ability to suppress any information signal that falls within their scope.
The use of the device is advisable in offices or laboratories, in general, wherever a special regime of secrecy must be maintained. 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 the noise of the audio range, which can prevent the leakage of information during meetings or especially important negotiations. The room at the same time“wrapped in white noise.”
In addition to the above examples, the noise generator can be used for other purposes. Probably, many people remember the Sea Battle slot machine, in which it was necessary to knock out a ship with a torpedo. Upon hitting the target, a noise generator was turned on, which worked in the audio range and simulated the sound of an explosion.
Such a device is easy to design if you know the principle of its operation. A device operating in the audio range generates audio frequency signals that are equal in amplitude. A feature of the device is that a mixed signal is simultaneously present at the output. It can be generated, for example, on a microprocessor, accurately dividing the audio range and mixing 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 a zener diode consists of a parametric stabilizer. The signal is taken directly from the zener diode and given to the operational amplifier with a certain cutoff frequency. The white noise isolated in this way remains to be amplified with the help of an ultrasonic frequency converter and transmitted to the speaker. The device works steadily in a wide range
temperature and starts to generate a mixed frequency signal immediately after installation and connection to a power source. Pretty interesting to hear how a zener diode works.
Complete appliances can also be purchased atstores. As an example, consider the noise generator GSh-1000M. The device is compact, and the radius of its 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 computer centers or terminals. In this case, the devices can be placed at a distance of 20 m from each other. The radiation generated by the generator does not exceed the permissible limits and does not harm the he alth of the maintenance personnel.
