This circuit was found in Motorola documentation from the 1980s. The components are of the time, not currently common as operational and opto receiver.
In the figure we have the way to control a triac with a low current and low voltage switch,...
This trigger circuit was found in old European documentation, but it can be implemented with...
May 2017 - The new ROHM SFR series anti-sulfur resistors can now be obtained from Mouser...