SM-3TB203

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SM-3TB203 Trimmer Potentiometers

The SM-3TB203, which stands for "Surface Mount 3 Thumbwheels, 203-Throw" is a unique three-track potentiometer. With its various forms of applications, the SM-3TB203 has proven to be popular across the globe, due to its unique design, high-quality construction, and diverse range of uses.

Application Fields

The SM-3TB203 is typically used for a variety of applications, including but not limited to the audio, control, instrumentation, telecommunications, automation, and security industries. Its ability to be used in both static and dynamic conditions, along with its features of being low-profile and weatherproof, make it an ideal choice for many outdoor and indoor applications. Additionally, its specialized design helps prevent accidental or unintended adjustment.

Due to its track and throw setup and its ability to have multiple tracks of varying resistance, the SM-3TB203 can be used in electrical circuits that require multiple points of adjustment or require the adjustment of multiple tracking inputs, such as in a summing amplifier circuit where two signals need to be adjusted simultaneously. It is also used in controllers, sensors, and other instruments that require multiple adjustments.

The SM-3TB203 is also commonly used as both a volume and balance control in audio equipment. Due to its three-track format, it is often used in amplifiers, amplifiers-mixers, and stereo systems to adjust the overall volume and the balance between the left and right channels. Additionally, it is used in radio broadcast systems, to adjust the tunable frequencies.

Working Principle

The SM-3TB203 is a three-track potentiometer that utilizes three thumbwheels to adjust the resistance across its tracks. Each track has its own throw and rotary action which is adjusted by rotating the thumbwheels. The tracks are engineered in such a way that they interact with each other depending on the position of the thumbwheels, as the position of each of the thumbwheels affects the resistance of its corresponding track.

When the thumbwheels of the SM-3TB203 are rotated, the resistance of each track is changed. This resistance change is equivalent to a voltage change, and this relationship between the two is determined by the application. As a result, this allows the device to be used for applications that require the adjustment of voltage inputs.

This device also has built-in discrete switching capabilities, which is achieved through the use of a contact bridge. This bridge is positioned between two of the tracks and is connected to an external electrical circuit. When the resistance of the track exceeds a predetermined threshold, the contact bridge will close and the electrical circuit will be activated.

Conclusion

The SM-3TB203 trimmer potentiometer is a highly versatile three-track device that is popular across many industries due to its low-profile, weatherproof construction, and multiple applications. It utilizes three thumbwheels to adjust the resistance and thereby the voltage of each track, and has discrete switching capabilities as well. The SM-3TB203 is sure to be a useful and reliable device in any project it is used for.

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