This circuit is from Delco Radio found in a 1968’s documentation. The transistors are of the time and are not given information about the driver transformer. Note the high supply voltage.
The circuit shown in the figure is suggested by Micrel, based on the MIC2570 boost voltage...
The presented circuit uses an uncommon operational amplifier but can be implemented with a more...
This circuit was found in documentation from the 1980s. The integrated circuit is from the time...