This circuit is suggested by General Electric in 1966 documentation. The Triac must match the engine. The resistors depend on the triac's sensitivity to firing.
This circuit was found in a 1967 Raytheon optoelectronics manual. The circuit uses tubes. | Clique...
This circuit is from the 1983 Intersil Databook. The circuit has an A / D converter for display of 4 and...
In this circuit, from a 1977 publication, we have the traditional version of a filter that rejects 1...