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 circuit below is found in the manuals of several manufacturers in the LM123 series of...
The integrated circuit used in this 70's project is unusual, being the critical element of an...
We found this circuit in Radio Electronics magazine from May 1967. The circuit has the tuned...