This is a video tutorial about operational amplifier and super microphone circuit. This video shows how an operational amplifier works and an example of amplifier circuit for microphone. The op amp has five important pins. they are output pin, non-inverting input pin, inverting input pin and negative and positive voltage supply input pin. The output voltage will come out from output pin, and the input voltage come from negative and positive voltage supply input pin. Here is the video :
This video also explains how to calculate the gain of the op amp. The classic non inverting circuit also explained in this video. Besides that the video also provides the datasheet of the op amp.