Toroidal Ferrite Magnet - for Speakers, round, black
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Over the past few years, we’ve been learning about some important mechanisms that can combine to cause radio frequency (RF) interference to sound systems.
They are:
1. An audio cable will be excited as an antenna by radio signals that are nearby, and current will flow along its length. Most of this current will flow on the shield. Antenna action will also cause a voltage to be impressed along the length of the cable, which can appear as a common-mode component on the signal conductor(s).
2. Improper termination of cable shields within equipment (the Pin 1 problem) injects RF shield current directly into the equipment, where it is detected.
3. Inadequate balancing of shielded cable converts RF shield current to a differential voltage on the signal pair – “shield-current-induced noise” (SCIN).
4. Inadequate low-pass filtering of signal input and outputs lets RF present on the signal conductors into equipment. Equipment can be susceptible to both differential mode voltage (between the signal conductors) and common mode voltage (an equal voltage on both signal conductors). Analysis of these mechanisms shows that RF shield current is a major contributor to all of them, so eliminating or reducing shield current should be the key to eliminating the interference. Experimental work near WGN’s 50 kW AM transmitter confirmed this hypothesis. At WGN, virtually all cases of interference in both microphones and input equipment, many of them quite severe, were either eliminated or greatly reduced when a cable connecting the mic to the input gear was wound around a toroidal ferrite to form an RF choke that reduces that current.
To test the effectiveness of ferrite chokes in audio RFI applications, selected product samples were ordered, and a series of tests were run. Extensive laboratory work has shown that ferrite chokes make very effective RFI filters if properly applied. This Tech Topic studies the use of ferrites to eliminate RF interference to audio systems. Ferrites are ceramics consisting of various metal oxides formulated to have very high permeability. Iron, manganese, manganese zinc (MnZn), and nickel zinc (NiZn) are the most commonly used oxides. When a ferrite surrounds a conductor, the high permeability of the material provides a much easier path for magnetic flux set up by current flow in the conductor than if the wire were surrounded only by air. The short length of wire passing through the ferrite will thus see its self inductance “magnified” by the relative permeability of the ferrite. The ferrites used for suppression are soft ferrites – that is, they are not permanent magnets.
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See: Small and round permanent magnet - De Neodimio Material: Ferrite Y30 Size: Diameter 100mm Thickness 15mm Inner hole 60mm Ferrites are sintered from iron oxides and other ingredients. Produced by powder metallurgy. The ferrite magnet has a low remanence and a small magnetic permeability. It has large coercive force and strong anti-demagnetization ability, and is especially suitable for magnetic circuit structure used as dynamic working conditions. The material is hard and brittle. Can be used in diamond cutting tools for cutting. The main raw material is oxide, so it is not easy to corrode. Operating temperature:-40 degrees Celsius - +200 degrees Celsius.The magnetic force is usually 800-1000 Gauss,which is often used speakers and other instruments.Magnet Blocks Magic Strong NdFeB Buck Block Creative Neodymium Magnet Magnets magnet block mini magnetic blocks
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