The strength of an audio signal can be controlled by touching sensors. Keeping the finger in “increase”, for example, the volume increases until the moment we remove the fingers and remains at that level. The circuit was obtained in a 1979 documentation and its implementation depends only on obtaining the integrated circuit. The signal cables must be shielded, and the power can be supplied by battery, since the consumption is low. C1 must be of good quality polyester to maintain the load and volume. R1 is 10M and not 10m as it is in the original documentation.
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