This simple charger was found in a 1980s documentation. The transistor may be the TIP42 with a heat sink. R1 adjusts the load current. The transformer has 1 A of secondary current.
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
The circuit shown in the figure below is suggested by ON Semiconductor (www.onsemi.com), based on...
This old circuit is from the era of analog televisions, serving for technicians to make...