Found on Bing from circuitdiagramimages.blogspot.com | Power supply circuit, Circuit diagram, Switched mode power supply
AC DC 12V 1.5A 5V 2A Switching Power Supply Module Bare Circuit 100 265V to 12V 5V Board TL431 regulator for Replace/Repair|Switching Power Supply| - AliExpress
Low Ripple AC-DC Converter 110V 220V 230V to 5V 2A Switching Power Supply Module | eBay