Computers, Equipment
How to use phantom power?
Phantom power is the transmission of information signals and power at the same time. In general, remote power is used in the event that it is not possible to connect to the mains 220 V. In recent years, such a system is increasingly used to power the security and telephone equipment. The phantom power supply unit can also be used successfully to connect a microphone, keyboard or electric guitar.
Depending on the method of feeding the supply voltage, there are two versions of this system. In the first case, the supply voltage is supplied via a separately laid cable or unused conductors of trunk cables. In the second case, it is routed over the backbone cable along with the Ethernet signal. In this case, additional cable conductors are not used.
Phantom nutrition on balanced sources of negative impact does not have. If a keyboard or an electric guitar is connected to it, it is necessary to use switchgears, whose task is to lower the supply voltage to the mark required by the connected device. It is also recommended that the source to which the phantom power is connected does not feed other devices that require more current.
At first glance, everything may seem quite simple and understandable, but this is by no means the case. The fact is that the filter task is not only the separation of constant and variable components. Therefore, it should also be broadband. A filter in a wide bandwidth should not distort the shape of the signals. To ensure that the acceptable length of the link does not decrease significantly, it should not lead to noticeable attenuation.
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