Found in American documentation from the 1970s, this circuit can be designed based on a modern SCR, such as the TIC106. The SCR must be provided with a heat sink.
This circuit was found in an Electronic Design from 1967. The circuit uses two triacs being T2...
Found in old American documentation, this circuit can use crystals between 27.5 and 33 MHz...
This shield from the 60's uses a germanium transistor of the time and a common type of relay of...