With the amount of equipment in home entertainment centers today the  need to be able to vary the gain of the audio or video signal is needed.  I found this particular circuit helpful when used in conjunction with  the Universal Descrambler and a Stabilizer circuit I built for making  copies of video tapes. It not only allowed me the ability to fine tune  the video strength it also helped me increase the recorded audio which  typically becomes poor when making tape copies. Circuit operation is  straight forward for amplifier circuits. The second channel for the  audio amplifier is made up of the same components except the other half  of IC1 is used. Pin 6 & 5 are inputs and 7 is the output.
Circuit Diagram


Circuit Diagram




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