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.
E) We found this circuit in a PE Hobbyst Handbook from the 90s. The components are common, except...
This circuit mutes a system when a phone call is received. The circuit is from a Radio Electronics from...
This circuit is from a 1968 General Electric manual. It produces a pulse of light when fired,...