barcode generator in vb.net The Potentiometer in Software

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The Potentiometer
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Figure 6-8 is a simplified drawing of the construction of a potentiometer, or variable resistor. A resistive strip, similar to that found on film-type fixed resistors, is bent into a nearly complete circle, and terminals are connected to either end. This forms a fixed resistance. To obtain the variable resistance, a sliding contact is attached to a rotatable shaft and bearing, and is connected to a third terminal. The resistance between the middle terminal and either of the end terminals can vary from zero up to the resistance of the whole strip. Some potentiometers use a straight strip of resistive material, and the control moves up and down or from side to side. This type of variable resistor, called a slide potentiometer, is used in hi-fi audio graphic equalizers, as the volume controls in some hi-fi audio amplifiers, and in other applications when a linear scale is preferable to a circular scale. Potentiometers are manufactured to handle low levels of current, at low voltage.
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Linear-Taper Potentiometer One type of potentiometer uses a strip of resistive material whose density is constant all the way around. This results in a linear taper. The resistance between the center terminal and either end terminal changes at a steady rate as the control shaft is turned.
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The Potentiometer 91
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6-8 A simplified functional drawing of a rotary potentiometer (A), and the
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schematic symbol (B).
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Suppose a linear-taper potentiometer has a value of zero to 280 . In most units the shaft can be rotated through about 280 , or a little more than three-quarters of a circle. The resistance between the center and one end terminal will increase right along with the number of angular degrees that the shaft is turned. The resistance between the center and the other end terminal will be equal to 280 minus the number of degrees the shaft is turned. The resistance is a linear function of the angular shaft position. Linear-taper potentiometers are commonly used in electronic test instruments and in various consumer electronic devices. Figure 6-9 is a graph of relative resistance versus relative angular shaft displacement for a linear-taper potentiometer.
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Audio-Taper Potentiometer In some applications, linear taper potentiometers don t work well. The volume control of a radio receiver or hi-fi audio amplifier is a good example. Humans perceive sound intensity according to the logarithm of the actual sound power. If you use a linear-taper potentiometer as the volume control for a radio or other sound system, the sound volume will vary too slowly in some parts of the control range, and too fast in other parts of the control range. To compensate for the way in which people perceive sound level, an audio-taper potentiometer is used. In this device, the resistance between the center and end terminal increases as a nonlinear function of the angular shaft position. The device is sometimes called a logarithmic-taper potentiometer or log-taper potentiometer because the nonlinear function is logarithmic. This precisely compensates for the way the human ear-and-brain machine responds to sounds of variable intensity. Audio-taper potentiometers are manufactured so that as you turn the shaft, the sound intensity
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6-9 Resistance as a function
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of angular displacement for a linear-taper potentiometer.
seems to increase in a smooth, natural way. Figure 6-10 is a graph of relative resistance versus relative angular shaft displacement for an audio-taper potentiometer.
The Rheostat A variable resistor can be made from a wirewound element, rather than a solid strip of material. This is called a rheostat. It can have either a rotary control or a sliding control. This depends on whether the resistive wire is wound around a donut-shaped form (toroid ) or a cylindrical form (solenoid ). Rheostats have inductance as well as resistance. They share the advantages and disadvantages of fixed wirewound resistors. A rheostat is not continuously adjustable, as is a potentiometer. This is because the movable contact slides along from turn to turn of the wire coil. The smallest possible increment is the resistance in one turn of the coil.
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