SM-3W105

Series:	SM3
Packaging:	Bulk
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Resistance:	1 MOhms
Power (Watts):	0.125W, 1/8W
Tolerance:	±20%
Temperature Coefficient:	±100ppm/°C
Number of Turns:	11
Adjustment Type:	Top Adjustment
Resistive Material:	Cermet
Mounting Type:	Surface Mount
Termination Style:	J Lead
Size / Dimension:	Rectangular - 0.154" x 0.126" Face x 0.154" H (3.90mm x 3.20mm x 3.90mm)

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Trimmer Potentiometers

Trimmer Potentiometers, as their name implies, are adjustable components used in electronic applications. They are often used to precisely adjust the level of power or resistance in circuits, and are designed to maintain their settings over a wide range of temperatures and conditions. One of the most popular and commonly used trimmer pots is the SM-3W105. This useful component has a variety of application and working principles which are explored in the following sections.

Application Field

The SM-3W105 Trim Potentiometer is typically used in a variety of audio applications, such as for balancing amplification levels in sound systems. It is also commonly used in CCTV cameras to regulate the voltage settings. This trimmer pot is also widely used in communication devices and home appliances, where precise calibration is required, such as TVs, DVD players, CD players, computer peripherals, and some industrial instruments.

Working Principle

The SM-3W105 trimmer pot operates on a three-wire system, meaning it requires additional wires to control its operation. Normally, the device is powered indirectly by the board voltage, allowing the user to adjust the setpoint of the component. The trimmer pot is connected to the circuit in order to open and close pathways in the circuit, controlling the resistance between the two points and thus adjusting the current.The control unit of the SM-3W105 is the adjustment shaft which consists of two sections, the top part which is connected to the center axis and the bottom part which acts as a toggle or switch. When the adjustment shaft is rotated, it releases a corresponding signal which moves the contact arms in the circuit, increasing or decreasing the resistance between the two points as needed.

Conclusion

The SM-3W105 is a popular trimmer pot used in many electronic applications, most notably audio applications. It operates on a three-wire system, with an adjustable shaft which controls and adjusts the resistance of the circuit. Separate from its application field, the SM-3W105 trimmer pot is also useful from a principles point of view as it gives us an understanding of how some adjustable components work in circuits.

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