How to convert AC to DC without Transformer, 220v to 12v dc converter

What is the best transformerless power supply circuit for converting AC to DC (230VAC to 12VDC)? - Quora

220v ac to 12v dc converter without transformer , 220v led driver , led driver

220V-AC to 12V-DC 18W Switching Power Supply - Technology - PCBway

Transformerless Power Supply Circuit Diagram

Transformerless Power Supply - 220V AC to 9V DC

5 volts DC Regulator without Transformer Using MOSFET

4 Simple Transformerless Power Supply Circuits Explained - Homemade Circuit Projects

voltage regulator - Transformerless power supply - Electrical Engineering Stack Exchange

How to convert 220 volt AC to 12 volt DC without a transformer at home - Quora

Where the transformers have gone from AC to DC converters, what are the components which can replace a transformer and can convert a 220V AC to 5V DC? - Quora

AC to DC Conversion : 3 Steps - Instructables