☑ Electronic Controlled Resistor

Four typical resistors sitting side by side in an electronic circuit. The jfet and the mosfet.

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Vcrs are most often built with field effect transistors fets.

Electronic controlled resistor. The input port voltage controls the value of the resistor between the output ports. Seems like it might be possible to use some form of circuit topology to get a nice vcr andor ccr that works over a wide ranges of voltages currents and resistances that an be floating. Anyone care to give it a try.

Im sure the circuit can be simplified and optimized. A digital potentiometer is a variable resistor which is controlled by digital signals instead of by mechanical. A resistor impedes the flow of electricity through a circuit.

The diagram below shows the working principle of a digital potentiometer with 64 steps. Its also possible to construct current sources that are exponential in their response to applied voltages which can be useful if the application is going to be for an audio volume control. Resistors have a set value.

Since voltage current and resistance are related through ohms law resistors are a good way to control voltage and current in your circuit. Its then straightforward to build a linear voltage controlled current source and the combination will give you your voltage controlled resistor. A resistor works by converting electrical energy into heat which is dissipated into the air.

Devices called resistors let us introduce precisely controlled amounts of resistance into electrical circuits. Today potentiometers are much smaller and much more accurate than those early large and bulky variable resistances and as with most electronic components there are many different types and names ranging from variable resistor preset trimmer rheostat and of course variable potentiometer. 300k which easily can be changed by modifying the resistor values.

A voltage controlled resistor vcr is a three terminal active device with one input port and two output ports. Lets take a closer look at what they are and how they work. Two types of fets are often used.

The nature of vcrs a voltage controlled resistor vcr may be defined as a three terminal variable resistor where the resistance val ue between two of the terminals is controlled by a voltage potential applied to the third. For a junction field effect transistor jfet under certain operating conditions the resistance of the. Digital resistors can be controlled by using simple updown signals or by serial protocols such as i2c or spi.

In electronic circuits resistors are used to reduce current flow adjust signal levels to divide voltages bias active elements and terminate transmission lines among other uses. A resistor is a passive two terminal electrical component that implements electrical resistance as a circuit element.