We found this circuit in a 1996 publication. The circuit uses components that are still common. The timing depends on C1, which can be changed, and the triac can be of any type.
Found in Radio Electronics from the 80's, this circuit can also be controlled by a microcontroller acting...
This 9 V amplifier has a gain of 20 and provides a power of a few hundred milliwatts. The circuit is...
This is a simple circuit to control a set of lamps from 3 different points. We found it in an old...