I would like to ask about when is need to put a voltage follower (buffer) to a circuit.
For example i create a circuit which has a transmitter/ receiver ...and use ultrasonic sensor. At the transmitter circuit i will need a voltage follower(buffer) before the sensor?
The buffer stage is used to increase the sensor isolation by offering high impedance to input and a low impedance drive to the output load .
The current load on sensor is a few microamps only whereas the drive can be a few milliamps ,,be linear and has wider range of functions .