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MULTIODORNIK ELF-VLF - POWER SUPPLY SYMETRATION SYSTEM - PLATE PCB
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MULTIODORNIK ELF-VLF - POWER SUPPLY SYMETRATION SYSTEM - PLATE PCB
Producer: AVT
The ELF-VLF receiver, or rather a set of receivers, enables reception of mysterious radio signals with extremely low frequencies. It is possible to observe signals of communication with submarines and so-called Schumann resonance.
It is possible only in extra-urban conditions (eg during trips), and this is due to the high level of industrial disturbance in cities. In the city, the described systems can be used, for example, to observe storms and the level of industrial disturbances. Such their use can also be very interesting. A lot of information about the reception of electromagnetic waves at very low frequencies, below 30kHz, as well as about antennas used for this type of receivers, is provided in the article 'Receiving ELF-VLF radio waves'.
The project presents four receivers, designed to receive radio signals (electromagnetic waves) in the range from 3Hz to 30kHz, thus including bands: ELF, SLF, ULF and VLF. The first of the receivers (I) cooperates with a wire antenna, reacting to the electrical component of the electromagnetic field. It was made in two system versions (Ia and Ib). The third and fourth are designed to cooperate with a loop antenna, reacting to the magnetic component of the electromagnetic field. The article also describes the system generating symmetrical power supply voltage and systems improving work comfort by increasing resistance to unwanted signals: two low-pass filters with band respectively 200Hz and 20kHz, bandpass filter, reducing the hum of 50Hz and optoisolator m signals .cz. The described systems do not require tuning or startup, so that even a novice electronics can do it. The big advantage of these systems is the low cost of their implementation.
Note: the project has been divided into 6 parts:
- AVT3054 / 1 - Receiver designed for cooperation with an electric antenna (version Ia and Ib)
- AVT3054 / 2 - Receiver cooperating with a magnetic antenna I
- AVT3054 / 3 - Receiver cooperating with magnetic antenna II
- AVT3054 / 4 - Power supply symmetrization
- AVT3054 / 5 - Filter module
- AVT3054 / 6 - Optoisolation of audio signals
AVT3054 / 4
The receivers (AVT3054 / 1, AVT3054 / 2, AVT3054 / 3) should be supplied with symmetric voltage from a pair of batteries or accumulators or by means of an 'artificial mass' generating system. The use of such a symmetrical power supply significantly simplifies the construction of the systems. If you need to use a power supply other than battery or battery power, you should carefully choose the system solution. It should be remembered that all switched-mode power supplies and DC / DC converters are sources of voltage disturbances that are too strong to be used directly.
Includes AVT3054 / 4 printed circuit board and documentation.
Detailed description in EdW3 / 13 or
Additional materials:
Article 'ELF-VLF radio reception' from the journal Elektronika Dla Wszystkich 10/2011
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