This tone control was obtained in the Audio Handbook of the National Semiconductor of 1977. The circuit controls the signals of medium frequencies in a wide dynamic range as shown in the diagram.
This circuit changes the dynamic range of an audio signal. The integrated circuit used in this...
This circuit uses PNP transistors that can be BC558, but if the power is reversed, BC548 can be...
We found this circuit in old documentation from National Semiconductor. The circuit makes use of a...