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Navigation:: Home >> Circuits and design >> this page Op-amp variable gain amplifier- a variable gain circuit using an operational amplifier
A useful variable gain and sign amplifier can be constructed using a single variable gain amplifier. The circuit uses a single operational amplifier, two resistors and a variable resistor.
Variable gain operational amplifier circuit Using this circuit the gain can be calculated from the formula below. In this the variable "a" represents the percentage of travel of the potentiometer, and it varies between "0" and "1". It is also worth noting that the input impedance is practically independent of the position of the potentiometer, and hence the gain
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