Single power supply non-phase input AC amplifier circuit diagram

The power supply Vcc divides the voltage through R1 and R2, so that the potential of the non-inverting input terminal of the op amp is blocked from DC by C, causing RF to introduce full DC negative feedback. Therefore, the voltage at the output terminal of the operational amplifier in static state is V0=V-≈V+=+Vcc/2; C communicates with each other, causing RF to introduce negative feedback in the AC part, which is voltage series negative feedback. The voltage gain of the amplifier circuit is

The input resistance of the amplifier circuit Ri=R1/R2/rif≈R1/R2,

The output resistance of the amplifier circuit R0=r0f≈0.