TORCHSTAR 10-28V AC to 12V DC Converter, AC/DC to DC, 15-40V DC to 12V DC Power Supply, Step Down Transformer, LED Driver for Low Voltage Landscape Lights, IP68 Waterproof, 5A Max :
AC12V to DC12V power converter 12V to 12V AC-DC power module for monitoring equipment
220V AC to 12V DC Converter Power Supply Using Diodes, Capacitors, Resistors, & Transformers - YouTube
How to turn a 12V DC supply into a 12V AC source - Quora