A non-inverting amplifier has an external resistor of value 100 ohms. What is the value of R2 that would produce a gain of 13? - Quora
operational amplifier - How to calculate Op Amp's gain using Arduino's ADC - Electrical Engineering Stack Exchange
Non-inverting Gain for ideal and non-ideal Op-Amp Calculator | Online Non-inverting Gain for ideal and non-ideal Op-Amp Calculator App/Software Converter – CalcTown