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The trimmer resistor is a calibration device used to correct (trim) the resistance of some other resistor. An example might be the feedback loop of an op-amp in common mode. If you wanted a gain of two, you might use a resistor divider with a two to one ratio. Resistors have tolerance, however, so the stated value will not be exact. You place a trimmer resistor in series with one of the other resistors, picking the value so that, if the two other resitors were exact, the trimmer is set to midpoint, and that the trimmer's range covers the expected tolerance of the other resistors. Then you calibrate the circuit to the expected gain using the trimmer.

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What is a trimmer resistor?

A trimmer resistor usually called a trim pot is a small variable resistor it is used in circuits to do preset it is trimmed with a trimmer screwdriver it is made up with a round fiber disc with a layer of carbon with a wiper that run on the carbon layer to change the resistance it always have 3 connecting pins where the center one is connected to the wiper and the other two to opposite ends of the carbon strip.


how to wire in trimmer resistor?

To wire in a trimmer resistor, first identify the circuit location where you need to adjust the resistance. Connect one terminal of the trimmer to the circuit point where you want to adjust the voltage or current, and connect the other terminal to the ground or power supply, depending on the application. The wiper terminal (middle terminal) is then connected to the output where you want the adjustable resistance effect. Ensure the trimmer is rated appropriately for the circuit's voltage and current to avoid damage.


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