This 5V power supply with a 1.5 to 3 A current was found in Maxim documentation from the 90s. The integrated circuit is the MAX741D.
An interesting timer is shown in the figure, using one of the 4 NAND gates of the integrated 4001....
General Electric suggests this circuit in a 1980s documentation. The operational of the time is...
This simple adjustable source uses a PNP transistor that can be the BD136 for even slightly higher...