This circuit was obtained in a Electronics World of 1968. The transistors can be equivalent as the BC558 for the PNP and the BD135 for the NPN powering lamps from 3 to 12 V according to the supply.
Found on Popular Electronics this circuit has variations found throughout this site and section....
National Semiconductor suggests the figure circuit for stabilizing the peak value of an...
January 8, 2020 – Mouser Electronics, Inc. and celebrity engineer Grant Imahara today released the...