Found in a Philips' 1968 documentation, this circuit is slightly different from the previous one. The components are also from the era, and modern equivalents can be used.
This PWM control circuit was found in an old documentation, but appears elsewhere on this site...
a We find this circuit which has a traditional configuration in a 1988 publication. The circuit is...
Indicated for applications with a PC, this circuit was obtained in an English publication in 1992....