What is a voltage follower a.k.a. unity buffer?

These evil monsters pull on the Arduino's analog input pins and can disturb the sensor measurement process. There are many monsters but for now, let's just call them “sampling capacitance.” To mitigate the problems, a “buffer” is installed between the sensor and the Arduino. read more

Often this buffer has unity gain which is to say, the buffer’s output voltage is the same as the input voltage. The sensor’s output now appears much stronger that the gremlins thereby improving the measurement process. read more

A voltage follower (also called a unity-gain amplifier, a buffer amplifier, and an isolation amplifier) is a op-amp circuit which has a voltage gain of 1. This means that the op amp does not provide any amplification to the signal. read more

Voltage follower also know as buffer amplifier is a device which connects high impedance circuit to low impedance circuit. The gain of voltage follower is unity i.e. Av= 1. In Voltage follower, the output signal follows the input signal meaning the output is same as input. read more