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 is for analog TV video signals and was found in the March 1988 issue of Radio...
To make a single LED flash in time with your amplifier's music, we have the circuit given below. The...
Found in documentation from the 1970s, this reducing regulator uses integrated circuits and...