Found in an Elektor from the 90s, this circuit can be powered directly by the power grid. The circuit uses a rectifying bridge that can be replaced by 4 common diodes.
This circuit was obtained from Popular Electronics in 1993. It consists of a low frequency...
In the figure we have the simple way to obtain a digital inverter using a general-purpose...
This circuit was found in old documentation, but the setting applies to any operational. Resistors...