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If the fit is not snug enough, the core can be secured with cable ties or, if the center is large enough, the cabling can loop through one or more times. Clamp-on cores are also available, which attach without wrapping the wire: this type of ferrite core is usually designed so that the wire passes only once through it. For a simple ferrite ring, the wire is simply wrapped around the core through the center, typically five or seven times.
#The symbol for a ferrite core inductor is install#
In this use, the bead is a simple form of a balun.įerrite beads are one of the simplest and least expensive types of interference filters to install on preexisting electronic cabling. On unbalanced coax transmission lines (for instance, USB cables and video cables) the cable is designed to contain the signal, and beads can be used to block stray common mode current from using the cable as an antenna while not interfering with the signal carried inside the cable. On wires intended to be DC conductors, beads can block low level unintended radio frequency energy by acting as a low pass filter. Various smaller ferrite beads are used internally in circuits-on conductors or around the pins of small circuit-board components, such as transistors, connectors and integrated circuits. Large ferrite beads are commonly seen on external cabling. This is particularly common on data cables and on medical equipment. Conversely, if there are other sources of EMI, such as household appliances, the bead prevents the cable from acting as an antenna and receiving interference from these other devices. In this case the bead is required for regulatory compliance, to reduce EMI. A conductive cable acts as an antenna – if the device produces radio-frequency energy, this can be transmitted through the cable, which acts as an unintentional radiator.
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A ferrite bead with its plastic shell removedįerrite beads prevent electromagnetic interference (EMI) in two directions: from a device or to a device.