Is this transformer-less power supply a good idea?
125118
230V AC to 5V DC converter, lossless
91831
Using series of LM 78XX for power supply
156300
USB data transfer with a separate power source
85152
Laptop power adapter output compatibility
36224
Grounded AC-DC power supply, what connects to earth ground?
145553
4-20mA to 0-3V3 Converter
6516
Is zero input impedance good or possible when considering impedance matching?
67432
Can connecting of AC adaptor first into device, then into mains pose a risk of voltage spike?
59928
Transformer VA Ratings, Power factor, and Pulsed current
81094
Buzzing power supply
39104
Is UPS necessary to have for a PC?
140667
Is a diode needed for this simple mini solenoid circuit?
119036
What are the consequences of using a low-wattage USB-C power supply with a MacBook Pro?
14016
Least expensive way to boost DC voltage
67534
What is / how can I get a student-safe power supply for electronics projects?
44127
What are the ways to make a dual power supply from a single voltage source?
80781
Can a 20V 4.51A power supply be used with a computer that requires a 19V 3.42A power supply?