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trimmer potentiometer is a small potentiometer that is used for adjustment, tuning and calibration in circuits. When they are used as a variable resistance (wired as a rheostat) they are called preset resistors
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A trimpot or trimmer potentiometer is a small potentiometer that is used for adjustment, tuning and calibration in circuits. When they are used as a variable resistance (wired as a rheostat) they are called preset resistors. Trimpot or presets are normally mounted on printed circuit boards and adjusted by using a screwdriver.
= 65pcs Trimming Potentiometer top adjustment 100 ohm -1k Ohm Variable Resistors
Package included: 1x 65pcs Trimming Potentiometer top adjustment 100 ohm -1k Ohm Variable Resistors
The following IEC symbols are used for trimpots and preset resistors. Although these are the official symbols for occasionally adjusted resistors, the standard symbols for a potentiometer or rheostat are often used.
Trimpot symbolIEC standard Preset resistor symbolIEC standard Potentiometer symbolIEC standard Rheostat symbolIEC standard.
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|5 × 5 × 2 cm
Trimmer potentiometers and preset resistors are small variable resistors that are used in circuits for tuning and (re)calibration.
The material they use as a resistive track is varying, but the most common is either carbon composition or cermets. Trimpot is designed for occasional adjustment and can often achieve a high resolution when using multi-turn setting screws. When trimmer potentiometers are used as a replacement for normal potentiometers, care should be taken as their designed lifespan is often only 200 cycles.
Several different versions of trimpots are available, using different mounting methods (through-hole, SMD) and adjusting orientations (top, side) as well as single and multi-turn variations.
Single turn trimmers/presets are very common and used where a resolution of one turn is sufficient. They are the most cost-effective variable resistors available.
An open trimpot with a carbon resistive track Open, carbon track Single turn enclosed trimpot Enclosed, side adjust SMT mounted variable resistor Enclosed, SMD
For higher adjustment resolutions, multi-turn trimpots are used. The amount of turns varies between roughly 5-25, but 5, 12 or 25 turns are quite common. They are often constructed using a worm-gear (rotary track) or lead screw (linear track) mechanism to achieve the high resolution. Because of their more complex construction and manufacturing, they are more costly than single turn preset resistors. The lead screw packages can have a higher power rating because of their increased surface area.
Top adjustable multi-turn trimmer potentiometer Top adjusts, worm-gear. Side adjustable multi-turn preset resistor Side adjust, worm-gear Linear trimpot, side-adjustable Side adjust, lead screw
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