Variable Resistor Circuit Simple. Definition of variable resistor. The circuit uses a single operational amplifier two resistors and a variable resistor.
The output voltage is taken from a point between the two resistors. The circuit uses a single operational amplifier two resistors and a variable resistor. Which gets its base bias from a 5 k variable resistor.
Its input supply is 5 volt to 30 volts.
This pot helps the user to adjust or set the maximum cut off current for the output load. The voltage and current follow ohm s law and are proportional to each other. With the values shown the output cut off current or current limit can be set from 5 ma to 500 ma. R1 has been conducted variable in order that the gain of the circuit can be arranged at exactly the needed amount.
