Non-Inverting Amplifier Circuit

Figure 1.  Non-Inverting Amplifier Circuit Diagram

This circuit uses an operational amplifier configured as a non-inverting amplifier.  The main component of this circuit is the 741, a general-purpose operational amplifier.  This circuit employs a dual power supply that may range from +/-3V to +/-15V.  The output of this circuit is an amplified version of the input signal. The gain G of this amplifier is determined by R1 and R2 according to the equation G = 1 + (R2/R1).

Vin = I x R1 where I is the current through R1, which is also the current through R2.

Vout = I x (R1+R2).

Vout/Vin = G = (R1+R2)/R1 = 1 + R2/R1.