This circuit is based on a regulator component that consists of a transistor and zener in the same package. The circuit can be designed with the equivalent discrete configuration. The current is 200mA.
Found in a 90's EDN, this circuit changes the phase of a signal from 50 to 60 Hz in 120 degrees. The...
Found in old documentation, this oscillator operates with high voltage. The diode must be of the...
This circuit was found in a 1987 documentation but can be easily assembled today by the components it...