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Fixed Inductors, or fixed coils, are a type of electronic component in which the inductance remains constant over its range of operating frequencies. By design, fixed inductors are polar devices; when the flux inside the inductor changes, it causes an induced voltage across the windings. The induced voltage, in turn, creates a current, and the current determines the inductance of the coil. This inductance can be controlled by the number of turns in the windings, the length of the windings, and the internal construction of the core. These components are used in applications such as impedance matching, power supply filters, AC signal filters, oscillator circuits, and power supply support.

In impedance matching applications, fixed inductors are used to help optimize the signal level and reduce noise in a signal line. In power supply filters, the inductors are used to reduce the amount of noise and ripple in the output. In AC signal filters, the inductor is used to reduce the amount of AC harmonic content in the signal. In oscillator circuit applications, they are used to keep the frequency of the oscillator circuit from changing due to changes in environmental factors. And, in power supply support, they are used to increase the current handling capability of the power supply.

The working principle of fixed inductors is based on the principles of inductance. Inductance is the property of a material to oppose the change in electrical current or voltage when an external force is applied. In the case of fixed inductors, the coils are specially designed to maintain a constant inductance that is resistant to environmental factors such as temperature. When an external force is applied to the coils, the current and voltage within the coils will change, and the inductance of the entire coil will increase or decrease. This change in inductance is useful in applications in which the current needs to be maintained at certain level, such as power supplies or oscillators.

Fixed inductors also are used in magnetic circuits, which allow for the storing of a residual magnetic field when a voltage is applied to the circuit. When the voltage is removed, the magnetic field or inductance stored by the circuit is able to remain, just as it was before the voltage was applied. This behavior can be useful in circuits such as clocks, timers, and relays, where the residual magnetic field allows for the circuit to operate more efficiently.

In addition to these applications, fixed inductors are also used to increase the amount of energy stored in the circuit by producing a back-emf, or voltage, when the current passes through the inductor. This back-emf helps to increase the effectiveness of the circuit, as it is able to provide additional power to the circuit. These back-emf properties can be very beneficial in applications that require high power or high current, such as motors or power supplies.

Fixed inductors are also used in AC signal filters. In these applications, the inductor is used to reduce the amount of AC harmonic content in the signal by acting as a low-pass filter. This allows the signal to contain only the frequencies that are desired, while filtering out any unnecessary or unwanted frequencies.

Fixed inductors have a wide variety of applications in almost any field, and their use is often beneficial for improving the efficiency of electronic circuits. Though there are many different types of inductors available, fixed inductors are able to offer a very reliable and constant inductance, making them an ideal choice for many different types of applications.

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