Power Supply from China

Warning: Safety Aspects of Using Cheap Power Supply

The (Chinese) PSUs on following pictures have safety problems:

too small distance between traces on PCB = possible electric shock,
the diode on output (1N4148?) seems to be usable up to cca 200mA only = fire hazard,
psu2 has shortened the optoisolator input = no feedback.
...

The PSUs do not have electromagnetic interference filter.