With the help of electronic circuits today, you can realize the most daring ideas. A beginner radio amateur can even assemble 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 operating electronic devices: computers, mobile phones, etc. They are often called “jammers” because of the 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 privacy regime should 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 information leakage during meetings or critical negotiations. At the same time, the room is shrouded in white noise.
In addition to the above examples, the noise generator can be used for other purposes. Most likely, many people remember the “Sea Battle” slot machine, in which it was necessary to knock out a ship using a torpedo. When it hit the target, a noise generator was turned on, which worked in the sound range and simulated the sound of an explosion.
Such a device is easy to construct, if you know the principle of its action. An instrument operating in the audio range generates
audio signals of equal amplitude. A feature of the device is that a mixed signal is simultaneously present at the output. It can be generated, say, on a microprocessor, precisely dividing the sound 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 taken directly from the zener diode and transmitted to the
operational amplifier with a certain
cutoff frequency. The white noise selected in this way remains to be amplified by ultrasonic scanning and transmitted to the speaker. The device works stably over a wide range
temperature and begins to generate a mixed frequency signal immediately after installation and connection to a power source. It's pretty interesting to hear how the zener diode works.
Ready-made appliances can also be purchased at stores. As an example, 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 data 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 acceptable standards and does not harm the health of staff.