Found in a 1980s German publication, this circuit tests batteries by type. The circuit is based on a range of LEDs of different colors and is given a table with indications for various voltage ranges.
The basic configuration for a 4017 when used as a decade divider with one-of-ten decoded outputs...
This circuit was found in American documentation from the 90's. The circuit applies to any...
The great advantage of the circuit shown in the figure is the fact that its frequency is...