This circuit for a 6.3 V lamp was found in a 1970’s RCA documentation. The circuit applies to any triac and the LDR can be of any type.
This circuit was found in an 80s National Semiconductor documentation. The configuration holds...
Found in Radio Electronics from the 90s, this circuit has frequency and active cycle adjustment....
This circuit can be implemented with discrete transistors. We found it in General Electric's 1964...