ST42ETA100

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Trimmer Potentiometers - ST42ETA100 application field and working principle

Trimmer potentiometers are small electrical components that are used to control the frequency of an electric signal, thereby altering or modulating it. This type of potentiometer, usually made of ceramic, works on the principle of voltage divider. The ST42ETA100 is one of the most popular trimmer potentiometers, popularly used in professional electronics, such as in power supplies, audio equipment, computers and radios. It is most commonly used in applications requiring low power and ultra-high precision.

The ST42ETA100 is a 2-pin, vertical trimmer potentiometer that provides 180° of adjustment range. Its two terminals are connected to a wiper, which is the adjustable contact that is moved to vary resistance. The trimmer potentiometer is manufactured with an anodized aluminum body and high precision conductive ceramic track. It is also hermetically sealed in order to protect it from moisture and other contaminants. The connection to the rotary wiper is done via a flexible wire, instead of a rigid feedthrough, allowing for more precise positioning.

The working principle of a ST42ETA100 is based on the voltage divider rule, whereby the voltage between two points is divided between a resistor (potentiometer) and a voltage source. When the wiper of the potentiometer is adjusted, the voltage at the output terminal changes. The resistance of the trimmer potentiometer is then calculated using the formula: Vout = (R1 x Rin) / (R1 + Rin), whereVout is the output voltage, R1 is the resistance of the top terminal, and Rin is the resistance of the bottom terminal. Thus, when the wiper is adjusted, the output voltage changes.

The ST42ETA100 is commonly used for various audio applications, such as speaker level adjustments and filter modifications. It is also used in robotic arm circuitry for precise positioning of motors. The trimmer potentiometer is ideal for situations where accuracy and minimal power consumption are of utmost importance, such as in industrial and medical equipment. Additionally, due to its small size, it can be easily incorporated into designs with limited space.

In conclusion, the ST42ETA100 trimmer potentiometer is a highly accurate, low power electronic component that can be used in various audio and robotic applications. It works on the basis of the voltage divider rule, whereby the voltage output changes when the wiper is adjusted. This potentiometer is hermetically sealed for maximum protection from moisture and contaminants, and its small size allows for easy design integration.

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