This circuit is from a Popular Electronics from the 90s, consisting of a repeater relay for remote control of TV, which today can be done by Wi-Fi or other simpler resources.
This circuit is from a 1972 Motorola publication. Some of the used transistors can still be found,...
The Texas Instruments PLLatinum ™ synthesizer can be obtained from Mouser Elecgtronics to generate...
This circuit has the function of automating some type of equipment when a powerful transmitter is activated...