We found this circuit in a 1967 Electronic design. However, it can be easily implemented even today as it uses only common diodes.
This circuit from a Radio Electronics from February 1966 uses an LDR as a sensor. The transistor is a...
March 2017 - Texas Instruments LM5166 Synchronized Buck Converters are available at Mouser for 3V...
This is one of the possible triac power control configurations using as a trigger element a...