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.
An interesting interface solution that can be provided in some cases is the one shown in the...
This circuit has an interesting application. If a device with the selector switch in the 110 V...
We found this circuit in the 1972 RCA power transistors manual. The transistors admit equivalents and...