Found in a 1980s American documentation, this crystal-controlled oscillator generates 100 MHz signals. The crystal used is 20 MHz. Modern equivalent transistors can be used.
This circuit generates a pulse of duration determined by the capacitor when an object interrupts the...
This circuit was obtained in an Electronic Design from the 90s. The circuit uses transistors from the...
This circuit is from an old Motorola manual (1999) using an integrated circuit that is not very...