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 using a SIDAC is suggested by ON Semiconductor in its thyristor manual. The circuit...
This circuit uses two 4001 ports to drive a relay. The circuit is from Electronics Now magazine, July...
Suggested by a Popular Electronics, this small amplifier that has a detector to follow RF...