This circuit was found in a Delco 1965 publication. Transistors may be current equivalents according to the desired output voltage and current.
This circuit was found in documentation from the 80s. The components are from the time, but the...
This circuit is from Philips' 70s documentation. Transistors can be replaced by modern...
This circuit was found in a 2006 publication. It uses discrete components and CMOS that are still...