Two sensors are used in this simple remote-control circuit, one to switch on and one to switch off the relay. The circuit is from 1986 documentation. The transformer has 12 V of secondary.
This synthesized generator circuit was found in an article in October 1980 Radio Electronics...
This circuit is from a publication in the United States in the 1980s. The basic integrated circuit...
This circuit was found in an American magazine in 1976. It doubles the frequency of TTL signals in the...