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.
We found this amplifier for automotive use in the Philips Databook of 1990. The circuit has a...
Found in documentation from the 90's this circuit is for low currents. The transistor can be...
This 12V incandescent lamp switch with time delay was found in old documentation. The SCR can be...