Table of Contents
Connecting the output of an operational amplifier (op amp) directly to it’s Inverting (-) input, results in the same voltage being output as is the voltage being applied to the non inverting (+) input.
- Op amp voltage follower outputs the same voltage that is sensed by the noninverting (+) input.
A split/dual power supply has both a positive supply voltage (+V) and a negative supply voltage (-V), in relationship to 0V ground.
In the schematic diagram, a high enough voltage above ground will light the upper LED in the schematic diagram. Whereas a low enough voltage below ground will light the lower LED.
Keep in mind that the output of many op amps do not reach either + or – supply voltage. Often they fall approx. 1.5V short of the supply rails. You need to learn the output limitations of any op amp you use.
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