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.
May 2016 - Mouser Electronics is already sourcing the new modules from Murata MAGICSTRAP forUHF RFID....
May 2017 - Texas Instruments' new OPAx388 operational amplifiers can now be purchased from Mouser...
This circuit is from the time when cars used contact breakers. This 80's version measures the dwell...