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 commercial circuit N-101 was obtained in a Japanese publication from 1971. It is a typical...
The FET for this circuit from a 1977 documentation can be BF245 or MPF102. The circuit measures...
This circuit also detects leaks and rain. I found it in a 1967 English magazine, but it can be...