Know potentiometer.

Know potentiometer.

Assalamu'alaikum warohmatullohi wabarokatuh.

Greeting visitors elektronics.Dear visitors of Maswar services blog ,lets conference and re-learn this together. In this occasion we will discuss about the potentiometer.

Potentiometers are three-terminal resistor with a sliding connection that forms an adjustable voltage divider. If only two terminals are used (one fixed terminal and the terminal sliding), potentiometer acts as a variable resistor whose value is barriers can be changed. Potentiometers are commonly used to control electronic circuits such as controllers voice (tone control) on the amplifier.

Potentiometer sections consist of:

-Resistive Element -Body -Sweeper (wiper)

-axis

-first fixed connection.

-sweeper connection.

-Ring.

-Bolts .

-second fixed-connection.

Potentiometers are rarely used for controlling high power (more than 1 Watt) directly. Potentiometer is used to adjust the level of the analog signal (eg voice control on audio devices), and as control inputs for electronic circuits. For example, a light dimmer uses a potentiometer for switching control TRIAC, so indirectly control the brightness of the lights. potentiometer is used as a volume control sometimes comes with an integrated switch, thus opening the switch when the potentiometer wiper is at the lowest position.

Potentiometer Construction.

A potentiometer is usually made ​​of a semi-circular resistive element with a sliding connection (sweeper). Resistive element, with terminals at one or both ends, is flat or angled, and is usually made ​​of graphite, although other materials that might also be used instead. Sweeper is connected to the other terminal. In panel potentiometer, wiper terminal is usually located in the middle of the second terminal resistive element. For a single round potentiometer, sweeper usually moves less than one full turn along the contact. Potentiometer "double-loop" also exists, may be a torsion the resistive element and sweeper may move 10, 20, or more rounds to complete the cycle.

However, potentiometers double round selection is usually made ​​of the same elements with conventional resistive resistors single round, while sweeper driven via a worm gear. Besides graphite, materials used to make the resistive element is a resistance wire, plastic particles and carbon ceramic-metal mixture called cermet. In the linear slide potentiometer, a sliding control is used instead of rotary controls. Resistive element is a square path, not the path of the semi-circumference as the rotary potentiometer.

Potentiometer type of device is often used in adjusting the graph, such as equalizer graph. Because the openings are large enough to sweeper and knobs, potentiometer has a lower reliability when used in a bad neighborhood. potentiometer available with linear or logarithmic relationship between the sweeper position and the resulting resistance (potentiometer laws or "tapers"). maker potentiometer conductive pathways using conductive polymer resistor pastes containing resins and polymers, solvents, lubricants and carbon. Paths are made ​​by printing on the substrate surface Papua phenolic and baking it in the oven. Throughout the roasting process removes the solvent and allow the pasta to become a solid polymer. This process produces a durable track with stable resistance during operation.

The linear potentiometer.

The linear potentiometer has a resistive element with constant cross-section, resulting in devices with a resistance between the wiper terminal one proportional to the distance between the two .. Linear potentiometer is used if desired proportional relation between the rotation axis of the division ratio of the potentiometer, for example, controllers are used to adjust the central point of the oscilloscope screen.

The logarithmic potentiometer.

The logarithmic potentiometer has a resistive element which gets narrowed or made ​​of a material that has a resistivity varies. This gives the device resistance is a logarithmic function of the angle of the potentiometer shaft. majority of log potentiometer (especially cheap) is actually not really logarithmic, but use two linear resistive path to mimic the logarithmic law. Log potentiometer can also be made ​​using a linear potentiometer and an external resistor. Potentiometer truly logarithmic relatively very expensive. Potentiometer logarithmic often used in audio devices, especially as the volume control.

Potentiometer high power wire windings. Potentiometer of any type can be used also as a rheostat.

Rheostat most common way to vary the resistance in a circuit is to use a variable resistor or rheostat. A rheostat is a two-terminal variable resistor and are often designed to handle high currents and voltages. Rheostat is usually made ​​of a resistive wire wrapped to form a toroid coil with the wiper moving at the top of the toroid, touching the coil windings of one coil to the next. Potentiometer three terminals can be used as a two-terminal variable resistor by not using a third terminal. Often unused third terminal connected to the wiper terminal to reduce the resistance fluctuations caused by dirt. Similarly Post by Maswar service on the potentiometer may be understood and can assist in the practice nantinya.Jika want to visit this blog again but do not know the address, it should be noted that This blog address is http://maswarservis1.blogspot.com.

Wassalam.