The way to think about the circuit board layout when using mains is
to make sure an ant crawling over it cannot create a bridge between
mains and non-mains. Thus the slot and large spacing between high and
low voltage sides of the board.
The way to think about the circuit board layout when using mains is
to make sure an ant crawling over it cannot create a bridge between
mains and non-mains. Thus the slot and large spacing between high and
low voltage sides of the board.