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Trimmer Potentiometers

A trimmer potentiometer (trimpot) is a small adjustable variable resistor which is used for tuning or calibrating electronic circuits. They are available in different shapes and sizes engaging either a screwdriver or a flat blade for adjustment. They are made of plastic and/or ceramic and mainly used in precision electronics circuits.

4275P502K Application Field and Working Principle

The 4275P502K Trimmer Potentiometer is a miniature trimming potentiometer used to adjust, balance, and calibrate the electronic devices. It is a top adjust type trimming potentiometer and comes in a dust-tight case with PCB mounting. This trimpot can be used in radio receivers, recorders, medical instruments, process control instruments, security systems, audio stages, and operational amplifiers. The pot measures 3.6×2.8×1.45 mm, with a resistance range from 10Ω to 1MΩ with a linearity of ±10%.

The 4275P502K Trimmer Potentiometer works on the principal of the voltage divider. It consists of three connections; the two fixed points and one variable point. When a voltage supply is applied across the two fixed points, the variable point can be adjusted to create a variable voltage. This is because of the internal wipers used to control the resistance of trimming potential. The wipers are usually made up of a graphite or plastic layer and are connected to the adjustment screw. Turning the screw changes the resistance values ​​of the trimming potentiometer and thus varies the voltage output across the two fixed tappings.

Trimpot can be divided into three variants – Top adjust, side adjust and reverse logic trimpot. The 4275P502K top adjust trimpot requires a flat blade to adjust the voltage output. It is a bi-directional potentiometer that can both increase and decrease the resistance when adjusted by a flat blade.

The 4275P502K Trimmer Potentiometer comes with various features such as; a dust and waterproof cover, PC board mounting, and an insulation resistance of 5000MΩ. Furthermore, it is AEC-Q200 compliant and can operate in a wide temperature range of -40℃ up to +85℃. It is also designed to have high reliability, long life and excellent electrical properties.

Conclusion

The 4275P502K Trimmer Potentiometer is a miniature top adjust trimpot used for providing adjustable voltage outputs. It comes with an adjustable screw, dust and waterproof housing, PC board mounting and enhanced electrical properties. It is ideal for radio receivers, recorders, medical instruments, process control instruments, security systems, audio stages, and operational amplifiers.

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