This Power supply sources from 500 to 1,000 mA according the transformar and was found in a publication of the year 1958. The diodes can be now the 1N4004 and the transistor should be mounted on a heatsink.
An OR gate can be improvised using NAND gates of a 4001 as shown here. The diodes are...
We found this circuit in an old American documentation. The table gives the values of the...
USB58xx and USB59xx Devices Integrate a 2:1 Multiplexer to Support Reversible Connection of USB...