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Potentiometers are used for ...
For the Falstad Circuit Simulation, CTRL+Click Potentiometer Simulation
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Adjust the pot and watch the voltages change.
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A potentiometer (pot) is a variable resistor with an adjustable slider. You can think of it as two resistors (one on each side of the slider). The diagram above shows the commonest arrangement. There is another straight version often called a fader. Both types are used as volume and tone controls. They are notorious for being unreliable. Dirt gets into the moving parts and corrosion causes problems. Digital pots are available. These don't suffer from these mechanical problems.
When used for position sensing, potentiometers are classed as input transducers.
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