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Bac ste normal. It can be used to adjust the power supplied to a circuit, in which case it is properly known as a rheostat, although this term is becoming obsolete. A removable plastic finger-grip sold separately, in a variety of styles has been pushed into place. Slider Potentiometer Trimmer Potentiometer Often referred to as Trimpots, this is actually a proprietary brand name of Bourns.
Sliders are still found on some audio equipment. Such multiple-turn potentiometers typically allow 3, 5, or 10 turns to move the wiper from end to end. This uses a straight resistive strip and a wiper that is moved to and fro linearly by a tab or lug fitted with a plastic knob or finger-grip. Thevenun known as a slide potentiometer. They may be designed for screwdriver adjustment or may have a small knurled shaft, a thumb wheel, or a knob. Potentiometers are widely used in lamp dimmers and on cooking stoves see Figure It is often used to adjust sensitivity, balance, input, or output, especially in audio equipment and sensors such as motion detectors.
In Figurethe beige Spectrol trimmer is a single-turn design, whereas the blue trimmer is multi-turn. Newer Exerccices Older Post Home. The outer pair connect with the thforeme ends of an internal resistive element, such as a strip of conductive plastic, sometimes known as the track.
The symbols for a potentiometer are at the top. They are not usually accessible by the end user of the equipment, and their setting may be sealed or fixed when the equipment is assembled. Since less power is involved, the potentiometer can be small and cheap, and will not generate significant heat.
Alternatively, a switch inside a potentiometer may be configured so that it is activated by pulling or pushing the shaft.
The voltages shown assume that the resistive element has a linear taper and will vary slightly depending on wire resistance and other factors. The principle of operation, and the number of terminals, are identical to the classic-style potentiometer.
The correct symbols for a variable resistor or rheostat are shown at center, although a potentiometer symbol may often be used instead. Switched Potentiometer In this variant, when the shaft is turned clockwise from an initial position that is fully counterclockwise.
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In Figurethe base of the shaft shown in black is attached to an arm shown in green that moves a wiper orange along a resistive element brown.
This system wastes far less power than if the potentiometer controlled the lighting or heating element directly as a rheostat. The smaller slider is designed for through-hole mounting on a thelreme board. They are usually mounted directly on circuit boards to allow fine adjustment or trimming during manufacturing and testing to compensate for variations in norfon components.
Sliders typically have solder tabs or PC pins. Massive rheostats were once used for purposes such as dimming theatrical lighting, but solid-state components have taken their place in most high-wattage applications.
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Trimmers always have linear taper. Other multiple-turn potentiometers may use a screw thread that advances a wiper along a linear or circular track. Figure classic-style potentiometer. A potentiometer can also be used to insert a variable resistance in a circuit, in which case it should really be referred to as a variable resistor, although most people will still call it a potentiometer. Amplificateur logarithmique et exponentiel.
Figure classic-style potentiometer Schematic symbols for a potentiometer and other associated components are shown in Figurewith American versions on the left and European versions on the right in each case.
A full-size, classic-style potentiometer is shown in Figure This can be used to power-up associated components for example, an audio amplifier.
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The third center terminal connects internally with a contact known as the wiper or rarely, the pickoffwhich touches the strip and can be moved from one end of it to the other by turning a shaft or screw, or by moving a slider. The potentiometer adjusts the duty cycle of the power interruptions.
Solder tabs underneath the slider are hidden in this photo. Exercice Comparateur a un Seuil.