Motorola suggests this circuit in an 80's documentation. The circuit uses an inverter to produce a higher voltage for 9 V battery charge from a single cell.
September 2016 - Mouser Electronics is providing the new LDO voltage regulators from...
This 1965 Philips circuit uses old company transistors like the BFY51 and BFY50. The circuit is...
This is a commercial circuit from the year 1958. Transistors are germanium types and transformers...