This circuit was found in General Electric's 1965 documentation. It appears elsewhere on the site. The SCR and the diodes must be in accordance with the motor current.
This circuit uses only transistors and was found in a 2003 documentation. Transistor 2N3055 must...
We found this circuit in Motorola's Circuit Applications for the Triac 1971 manual. The circuit is for ½...
This circuit was found in a 1977 magazine, but it can be easily assembled today using BC548...