Ferrite Bead Inductance and Low Frequency Control

Ferrite Bead Inductance is the way that DC bias current is produced in a DC powered device such as an electric generator. Ferrite is the lightest of the precious metals, yet it is extremely durable and flexible at the same time. It has superior electrical and mechanical properties making it a popular choice for electronic equipment. Ferrite is formed through chemical reaction between ferric oxide and aluminum oxide. In this process the aluminum oxide produces a thin barrier around the ferrite, which limits the flow of current.

A ferrite bead has several important properties which make it useful for electrical engineering applications. Ferrite beads have high electrical conductivity due to its molecular structure, which makes it similar to copper. Due to the conductivity, the ferrite bead can maintain its integrity and functionality even under high mechanical forces.

Due to its exceptional electrical and mechanical properties, the ferrite bead has become a popular choice for small electrical generators which use a DC power source. Another important property of these small electrical generators is that they operate on a magnetic field. The magnetic field causes the flow of current through the beads. The high permeability of the ferrite beads make them susceptible to both high levels of thermal energy, and alternating magnetic field. This phenomenon induces a change in the internal resistance of the electrical conductor, which results in better performance and output. With the help of a ferrite bead inductance we can improve the output as well as the safety of the DC powered electrical generator.

Ferrite beads are used in several applications where the non-induced interference is very significant. One such use is in the production of high-efficiency headphones. Due to the non-induced interference, low frequency vibrations caused by nearby equipment may not resonate with the speaker. Due to the non-induced crossover distortion, the resulting audio signal is monotonous and boring. The low-pass filter network used in many headphones, including some headphones manufactured by well known brands, have a high Q factor. Due to the high Q factor the high frequency produced by the amplifier can be tuned with the high frequency produced by the speaker.

Ferrite beads can also be used in high frequencies systems in the audio industry. Due to the high frequency produced from the speaker, some high frequencies bands may not resonate with the speaker's diaphragm. However, if the bias is changed, then this will allow the high frequencies to be resonate with the diaphragm.

A low-pass filter which utilizes ferrite beads enables low frequency voltage spikes to be introduced into the circuit. The spike will excite the component like say a plate, and this will generate an unwanted current. The high frequency circuit generated by the current produced by the plate's diaphragm will cause some additional current that is conducted through the resistor. This added current will cause the current to excite another component, which will cause yet another additional current, and so on.