The purpose of this circuit is to produce a quick discharge on a shorted battery to attempt its recovery. The diode must be high current and the transformer too.
The CK722 transistor used in this circuit is one of the first commercial types in the world. The...
This automatic dimmer for incandescent lamps was found in a European publication from the 1980s. The...
This traditional doubler configuration with the 555 can be found in other articles on the author’s site....