Found in an old Popular Electronics, this circuit warns when a remote lighting system is not working. The circuit uses an LDR as a sensor and the components used are quite common today.
This circuit is from the 1983 Intersil Databook. The circuit operates on 5 V power and has a...
This low displacement circuit was found in American documentation from the 90s. Operational...
With a touch of the push button the lamp is switched on. A new touch and the lamp go out, in this...