This circuit is used in magnetic tape recorders, having been found in documentation in the 1960s. The circuit uses Japanese transistors, and the critical components are transformers.
This 12 V symmetrical power supply provides a current of the order of 100 mA according to the...
We found this circuit in the 1994 National Semiconductor Linear Applications Handbook. The circuit...
Found in a 1980s American documentation, this circuit is based on the common CMOS series...