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 control from a 1989 publication can be assembled with several equivalent components. The SCR,...
In the figure we have a circuit suggested by National Semiconductor, using an operational...
This circuit was obtained from an English magazine from 1976. What this circuit does is start from...