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.
This circuit is recommended by Texas Instruments in the datasheet of the TL317, equivalent to...
The circuit shown in the figure consists of a low voltage dropout (LDO) regulator for 200 mA using...
This circuit of a Popular Electronics is intended to control a wiper. The circuit consists of a...