This electronic Morse Key for telegraph message transmission was found in an American 1980s amateur radio documentation. The circuit uses TTL technology and must be powered by a 5V voltage.
Found in old American documentation, this circuit makes use of operational amplifiers from the 70s...
This circuit was obtained from a 1997 publication. It is an alarm that has a lock and a bistable...
The above project is an H –H bridge drive circuit and can be used to drive DC motors and in the...