This circuit was found in an American magazine 73 for radio amateurs of the 80s. It is an automatic transmission circuit for telegraphy. The circuit is TTL.
Found in Linear Technology documentation from the 1980s, this generator uses integrated circuits...
This circuit was found in an English magazine from 1979. The magazine no longer exists, but the...
This circuit is from an American documentation of 1975. The FET may be the BF245 and the relay is of...