This circuit detects when there was a power cut, triggering the indicator circuit around it. The circuit is powered by the voltage of a source connected to the grid.
This stage for JFETs was found in a 1965 US publication, but is valid for modern components. |...
Have you not yet memorized the color code used to identify resistors and capacitors? Do you have...
The transistors in this circuit from an English publication in 1980 may be the BC548. Operational...