Voltage follower circuit


Posted on Feb 5, 2014

An AC coupled unity gain gain voltage follower operating on a single supply is shown here. The voltage divider network of R1 and R2 provides a DC voltage equal to half the supply voltage to the non-inverting input of the 741. The output DC voltage therefore stands at half the supply voltage. The output signal swings above and below this value. The sta


Voltage follower circuit
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nding DC voltage at pin 6 does not matter because the output is coupled to the next stage via a capacitor. The input impedance is equal to the value of R1 and R2 in parallel, i. e. 500K Ohms in this case. Because of hundred percent negative feedback, the output impedance is very low. For low frequency applications C1 and C2 can be replaced by electrolytic capacitors of large values.




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