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.
This circuit was found in an old American publication. The integrated circuit used is no longer easy...
Using a transconductance operational amplifier, this circuit was found in July 1983 Radio...
This battery-powered emergency light circuit was published in an April 1962 Radio Electronics...