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.
The author has many books he had written in Eglish (See the Biography) published by famous...
This old taster circuit, found in 1970s American documentation, is for operatives and comparators of...
This 45 to 90 Hz hum elimination circuit was obtained from a 1980s documentation. The operational can...