Trimmers can be variable resistors (potentiometers), variable capacitors, or trimmable inductors. Common control components used include potentiometers, variable capacitors, and rotary switches. Moreover, analog sensors such as potentiometers and force-sensing resistors are still widely used. The input was six potentiometers (variable resistors) each having a dial with 26 letters. Simple servomotors may use resistive potentiometers as their position encoder. Motor outputs were controlled by 256-position digital potentiometers and 8-bit digital ports. Potentiometers used in combination with filter networks act as tone controls or equalizers. The resistive element of inexpensive potentiometers is often made of graphite. True logarithmic potentiometers are significantly more expensive. These acquisitions expanded the company into the new fields of semiconductors, relays, and potentiometers. Precision potentiometers have an accurate relationship between resistance and slider position. High-resolution multiturn potentiometers are used in precision applications. On panel potentiometers, the wiper is usually the center terminal of three. Membrane potentiometers can be used for position sensing. Common applications include textile machines, potentiometers and continuously variable transmissions.