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Mechanical potentiometers have been used since the earliest days of electronics and provide a convenient method for the adjustment of the output of various sensors, power supplies, or virtually any device that requires some type of calibration. Timing, frequency, contrast, brightness, gain, and offset adjustments are just a few of the possibilities. However, mechanical pots have always suffered from numerous problems including physical size, mechanical wearout, wiper contamination, resistance drift, sensitivity to vibration, temperature, humidity, the need for screwdriver access, layout inflexibility, etc
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