Even if you don’t care about noise performance, there’s a lot of good information about basic switching power supply design here. You can see the difference in a PCB that has a small hot loop ...

A variety of electronic devices, including televisions, cellphones (i.e., wall adapters), and computers, utilize AC/DC power supplies ... same idea depicted in Figure 1, a linear power supply is ...

Transformerless power supplies are showing up a lot here on Hackaday, especially in inexpensive products where the cost of a transformer ... a switch-mode power supply or wall-wart.

48V AC DC Adapter for Cisco AD10048P3 ASA 5505 341-0183-01 341-0183-02 ASA5505 Series 47-18790-05 V11 ASA5505V11 ASA5505-SEC ASA5505-PWR-AC Adaptive Security Appliance 48VDC Power PSU Cisco ASA ...