This circuit was found in a 1967 General Electric manual. It shows a SCR control with unijunction and zener diode. The triac depends on the controlled load.
This charger for a maximum current of 15 A was obtained from an American 80's schematics. The triac must...
This circuit is from the 1971 Motorola SCR Power Control Fundamentals. The circuit can be made...
This circuit, published in 1988, uses several types of sensors and relays to activate warning...