Potentiometers AWS

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can be adjusted by rotating the spindle. The other types are usually mounted on circuit boards and are adjusted using a small screwdriver. In type (b), the slider is driven along a straight track by a screw thread. Type (a) called a preset and as with type (d) the slider rotates approximately 270°. Their resistance can be set very.

Potentiometers Potentiometers are three terminal devices. The outside terminals are linked together by a semi-circular track made from carbon or resistance wire. The centre terminal is connected to a sliding contact which can be rotated over the track.

The pictures show a selection of potentiometers that are readily available from suppliers. The most commonly used is type (c) which is mounted on a panel. Its setting can be adjusted by rotating the spindle. The other types are usually mounted on circuit boards and are adjusted using a small screwdriver. In type (b), the slider is driven along a straight track by a screw thread. Type (a) called a preset and as with type (d) the slider rotates approximately 270°. Their resistance can be set very accurately.

Potentiometers are used for two applications in electronic circuits: A. In this case it is the variable voltage supply. The fixed supply voltage is connected across the outer terminals of the potentiometer. The variable output voltage is taken from the slider contact and one of the end terminals.

When the slider is at position 1, the full supply voltage is available at the output. The output voltage decreases as the slider is moved towards position 2. At position 2 the output voltage will be zero.

B. Variable resistor potentiometers can be set up to act as variable resistors to control the current flow in a circuit. In this instance, the slider terminal is connected to the end of track terminal and the unit set up as shown below:

When the slider is at position 1 the resistance track is shorted out and circuit current will be at its maximum value. As the slider is moved towards position 2, more and more resistance is included in the circuit. The variable resistor can be used to control the brightness of a bulb.

The bulb will be at its brightest when the slider is in position 2.

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