Non-inverting AC amplifier
See the attached figure. The characteristic of the in-phase AC amplifier is high input impedance. R1 and R2 form a 1/2V+ voltage divider circuit, and R3 is used to bias the op amp.
The voltage amplification factor Av of the circuit is also determined only by the external resistor: Av=1+Rf/R4, and the circuit input resistor is R3. The resistance value of R4 ranges from several thousand ohms to tens of kiloohms.
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