This control circuit or reversible contactor was found in a 1967 General Electric manual. The triacs must be in accordance with the power of the controlled load.
This series sensor circuit is from 1995 Popular Electronics. The circuit can use any SCR and the...
This reinforcing stages from a 1960s documentation. No information is given about the transformer...
This circuit was obtained from an American 1980s documentation. The frequency depends on the...