We found this circuit in a publication by General Electric in the 1980s. The transistors and the PUT are from that time. The control is done by a tachometer based on an optical coupler.
This power supply can be used to power circuits that do not require regulated voltages that can be...
This common operational configuration can be implemented with modern equivalent. Next to the...
Found in a PE Hobbyst Handbook of 1991, this circuit was originally proposed to time photographic...