3386X-1-155T

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Trimmer Potentiometers

The 3386X-1-155T is a trimmer potentiometer, a small, variable, three-terminal resistor of which the resistance can be adjusted by means of a screw or wiper. A trimmer potentiometer has a wide range of applications, including frequency adjustment, gain control, level setting, and calibration of many electronic circuits.

Application Fields: Trimmer potentiometers are commonly used to adjust the gain of amplifiers, adjust frequencies, adjust DC offset and adjust reaction time in electronic circuits. They are also used to calibrate certain circuits, and can be used as components in a voltage divider, allowing the user to easily adjust the voltage of the circuit. Further applications include adjusting the gain or attenuation of audio/video signals, setting the bias for amplifiers and protection circuitry, and adjusting the output of a sensor or signal processor.

Working Principle: The resistor in a trimmer potentiometer is composed of a fixed resistor between two contact terminals, and a resistive element between the third terminal and the wiper. The position of the wiper determines the resistance of the resistor. As the wiper is turned, the resistive element is moved relative to the fixed resistor, changing the resistance across the resistor.

Trimmer potentiometers employ a variety of technologies to adjust the resistance. Some use conductive ceramics, carbon resistors, cermet resistors, or metal film resistors. Other technologies, such as tantalum, nickel-chromium-iron, and conductive polymers are also used.

Trimmer potentiometers are available in a variety of form factors. The most common form factor is the axial trimmer, which is composed of two leads and a screw head on the top of the body. This type of trimmer can be adjusted by turning the screw using a flat head screwdriver.

The rotary trimmer features a rotary knob, which is used to adjust the resistance. It’s generally used in circuits where precise adjustment is needed, such as frequency adjustment.

Finally, the SMD trimmer is an extremely compact trimmer potentiometer that is often used in audio circuits and other miniature electronics. It’s designed to be soldered directly to the circuit board and it’s typically used in applications where space is limited.

In conclusion, trimmer potentiometers are used to adjust the resistance of a circuit, and are available in a variety of form factors for a variety of applications. They are an indispensable component of many electronic circuits.

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