SM-42TB202

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Trimmer Potentiometers are variable resistors used to adjust resistances in electronic circuits. They are commonly used for precision voltage and current adjustments, feedback circuit adjustment, and generator calibration. One type of trimmer potentiometer is the SM-42TB202 which is used in many electronic applications. This article explains the application field and working principle of the SM-42TB202.

Application Field

The SM-42TB202 trimmer potentiometer is designed for mounting on a PCB, particularly where space is at a premium. It is ideal for use in audio and volume control circuits, as well as for adjusting port and amplifier gain levels. The SM-42TB202 can also be used in precision power supply circuits, as well as in the very high impedance environment of microwave equipment. It is also ideal for use in industrial automation systems and control applications.

Working Principle

The SM-42TB202 uses a three-terminal configuration that can provide both on-board and off-board adjustment of its internal resistance. Its internal resistance can be adjusted by changing the position of the on-board trimmer arm. The resistance between the two outer terminals (the ‘end terminals’) of the trimmer potentiometer is determined by the position of the arm. The arm is used to move the internal contact arm (also known as the wiper) to point to the lower or higher resistance points, thus changing the effective resistance between the two outer terminals.

The resistance of the SM-42TB202 can be adjusted manually by turning the trimmer arm, or it can be adjusted automatically using a steady current source. This is known as ‘amplified adjustment’, and it provides more precise adjustments. In this setup, the resistance of the trimmer pot is changed by applying a current between the middle terminal (‘the wiper terminal’) and the end terminals, which causes the contact arm to move along the whole length of the resistor.

Conclusion

The SM-42TB202 trimmer potentiometer is an excellent choice for applications that require a small form factor and precise electrical control. It is suitable for installation on circuit boards or through-hole components and its three-terminal configuration provides both on-board and off-board adjustments. It can be adjusted manually with the trimmer arm or automatically with a steady current source, providing more precise adjustments. Its small size combined with its versatile performance make it an ideal choice for applications needing both space-savings and precision control.

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