This circuit was found in a 1980s documentation. The diodes may be general purpose diodes such as 1N34 or 1N60 and the indicator may be the lowest current range of a multimeter.
The transistor of this circuit found in an old American documentation can be the BC548 for T1 and...
This dimmer for incandescent lamps was obtained from an American 1990s documentation. The circuit...
This '90s circuit found in National Semiconductor documentation uses components from the time. |...