What is a programmable resistor?

A programmable resistor is designed to simulate the use of resistive sensors and variable resistors in systems when testing devices such as engine controllers.

What does a variable resistor allow you to do?

Variable resistors are widely used in electric circuits to adjust the value of current or voltage, since the resistance of variable resistors can be set to a certain value. Variable resistors allow you to adjust the value of voltage by changing the resistance and keeping current constant .

What devices use variable resistors?

Applications of Variable Resistors

• Audio control.
• Television.
• Motion control.
• Transducers.
• Computation.
• Home Electrical Appliances.
• Oscillators.

What is a preset variable resistor?

Presets are miniature versions of standard variable resistors. They are designed to be mounted directly onto circuit boards and adjusted only when the circuit is built. For example they may be used to set the frequency of an alarm tone or the sensitivity of a light-sensitive circuit.

What is a variable resistor in electronics?

An electronic component that is used to vary the amount of current that flows through a circuit. It works by sliding a wiper terminal across a resistive material, typically a thin film or chunk of carbon or a resistive wire made of nickel chromium or tungsten alloys.

What is variable resistor electronics?

When would you use a variable resistor?

A variable resistor is used in some dimmer switches and volume controls. The resistance of a thermistor depends on its temperature. At low temperatures, the thermistor has a high resistance. As the temperature increases, the resistance decreases.

How many types of variable resistor are there?

Symbols for Variable Resistors The following figure provides the IEC standard symbols for three types of variable resistors.

How many types of variable resistors are there?

As resistance increases, the amount of current decreases. Some examples of variable resistors are the volume control knob on a radio and a dimmer switch used for a light. Rheostats and potentiometers are two common types of these devices. Variable resistors have two basic components.

Which is better fixed resistor or variable resistor?

Circuits with LEDs use fixed resistors to limit the current, thus protecting the LED from damage. A variable resistor, commonly called a potentiometer (pot for short), allows you to adjust the resistance from virtually zero ohms to a factory-determined maximum value.

Is a variable resistor a fixed resistor?

Variable resistors means that a resistor can change its resistance value through the control of a person or himself. Fixed resistance means that it cannot change its value. The fixed resistance has only one value and never changes (except through temperature, age, etc.).

What is a variable-gain amplifier?

A variable-gain or voltage-controlled amplifier is an electronic amplifier that varies its gain depending on a control voltage. This type of circuit has many applications, including audio level compression, synthesizers and amplitude modulation.

What is a voltage variable amplifier (VCA)?

A Voltage Variable, variable gain, or voltage controlled amplifier is a type of amplifier with a gain dependent on a control voltage input. These amplifiers are the backbone of amplitude modulation circuits. There are a wide range of types and styles of VCA’s that use various methods of controlling the gain.

Is there a new version of Robin Getz’ operational amplifier?

This version (03 Jan 2021 22:24) was approved by Robin Getz. The Previously approved version (23 Aug 2019 15:14) is available. In this laboratory we continue our discussion on operational amplifiers (see the previous lab here: Activity 1. Simple Op Amps) focusing on variable gain / voltage-controlled amplifiers.

What is a voltage-controlled resistor?

The voltage-controlled resistor is one of the numerous interesting circuit elements that can be produced by using a transistor with simple biasing. Another approach is to use potentiometers to vary the value of the resistors that set the gain of the amplifier. Consider the circuit schematic presented in Figure 1. Figure 1.