4904-S

Adjustable inductors are generally applied to electronic devices where one or more variables (such as resistors, capacitors, frequency, voltage, current and the like) can be adjusted to achieve a desired electrical or electronic performance. One of the most common adjustable inductors is the 4904-S. This type is often used in applications such as RF amplifiers, frequency tuning, impedance matching, noise filtering, pulse modulation and tunable filters. In this article, we will take a closer look at the 4904-S application field and working principle.

The 4904-S is an adjustable inductor with a variable inductance of up to 0.5 H. This type of inductor is able to adjust its inductance by varying the current passing through it, allowing for a precise control of the inductor’s performance. This type of adjustable inductor is typically used in a wide range of RF/microwave applications, including RF power amplifiers, frequency tuning, impedance matching, noise filtering, pulse modulation, and tunable filters. It is a widely used device in the electronics industry due to its excellent performance and adjustability.

The 4904-S is a versatile adjustable inductor that is available in various inductance ranges. This type of inductor can be used in applications such as RF antennas, transceiver systems, amplifiers, signal conditioning circuits, and pulse modulation. Additionally, the adjustable nature of the 4904-S allows it to be used in custom applications such as switchable impedance matching, tunable filters, and amplifier tuning.

In order to understand the working principle of the 4904-S adjustable inductor, it is important to understand what an inductor is. An inductor is an electrical device that stores energy in the form of a magnetic field. The underlying concept is based on Faraday’s Law which states that a magnetic field created in a loop of wire will induce a voltage in the wire. The voltage generated in a wire is proportional to the rate of change of the current passing through it. This phenomenon is referred to as self-inductance.

The 4904-S inductor works by adjusting the self-inductance of the coil using currents applied to the terminals. This process is done in order to adjust the inductance to a desired value. In order to do this, the 4904-S has two terminals. The first terminal, known as the control terminal, is used to control the current applied to the coil. The second terminal, known as the sensing terminal, is connected to a sensing resistor which is used to sense the self-inductance of the coil.

The control terminal is connected to the sensing resistor through an internal amplifier circuit. This amplifier is used to adjust the current applied to the coil in order to adjust the self-inductance of the coil. The current applied to the coil is adjusted by the amplifier in response to the output of the sensing resistor. By adjusting the current applied to the coil, the 4904-S is able to adjust the inductance of the coil to a desired value.

The 4904-S adjustable inductor is a versatile and useful device in a wide range of RF/microwave applications. It has the ability to adjust its inductance by varying the current applied to it, allowing for precise performance. Additionally, the adjustable nature of the 4904-S allows it to be used in custom applications such as switchable impedance matching, tunable filters, and amplifier tuning.