Suggested by National Semiconductor in documentation from the 90s, this circuit uses a switched regulator of the time. The circuit is suitable for NiCad battery charges.
When the light that falls on the LDR is cut off, this 1992 circuit activates a relay for a set...
This photocell circuit was found in Radio Electronics magazine from July 1959. The transistor used...
This PWM circuit was found in an American publication in 1978. It consists of a simple control that...