This circuit from an old documentation includes the power supply for the 117 V power grid. It can be adapted to other networks by changing the 10k resistors.
This TTL sequential flasher circuit was found in the January 1981 issue of Radio Electronics...
This ohmmeter can be made with a scrap milliammeter used for continuity tests or even resistance...
This sensitive motion sensor with inductive sensor was found in a 90s Elektor. The circuit uses only...