This simple circuit is powered by the logic circuit itself. Components are still common, although they were obtained from somewhat old documentation.
Found in a 1968 Motorola documentation, this circuit operates at 1 kHz and can deliver 20 V from...
This interesting application of a stepper motor as an encoder serves to test its application...
Found in a 90s magazine for radio amateurs, this circuit can generate frequencies up to 45 MHz...