Recommended architecture for mains-powered design:
The "A20112" identifier is most commonly associated with a often found in DIY 3D printers, CCTV systems, and universal AC-to-DC converters . The "Story" of the A20112 Power Supply a20112 power supply schematic
Safety and protection details
Steps down the high-voltage AC from the grid to a lower, safer AC voltage. safer AC voltage.