This circuit was found in Motorola documentation from the 1980s. The components are of the time, not currently common as operational and opto receiver.
This circuit is from an Electronics Now from August 1995. The triac is according to the load that...
This circuit was found in RCA and General Electric documentation from the 1980s. The circuit has...
It can be obtained from Mouser Electronics new evaluation module for 1A stepper motors control...