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, for frequencies up to 100 kHz, was found in American documentation from 1970. The...
Photoelectric cells can be used as sensitive light sensors. However, the low voltage they generate...
This electronic defense was found in the 1990 special issue of Radio Electronics Experimenter...