Mini Step-Down Power Supply, Intelligent Home Switching DC Power Module AC DC Isolated Power Module 220v to 5v, HLK PM01 AC DC Converter 220V to 5V（3PCS）

Do the job. I have bounced the power on mine many time and no issue. Constant voltage and well packaged me.

Good product for the price, really. Not an instant supply when turned on, takes about a second and slow drain when off if that is an issue for your project. Someone here says is not breadboard friendly. It is, with a small modification. The supply rail of the breadboard is most likely continuous supply of power along the breadboard. You only have to snip the track underneath the bridges like sections on one end of the breadboard the mini power supply will fit perfectly sideways with the dc prongs on each side of the bridge

Fantastic

Muy buena fuente resuelve

The pins don't fit in a standard perf board. I'm not sure how you are supposed to use it. The only way is to solder wires straight to the pins. Not good if you ask me. Other than that it seems to work well.

I was taking apart 5v power adapters when I needed a 120v to 5v power source for my small projects. This saves some time, is much cleaner, circuit-board mountable, and only costs a little more. The data sheet suggests a putting protective filtering components on the 120v side of the supply.

Bought less than a month and tried one with a laser diode works out pretty well so far. Will see how long it goes. Based on the light condition, it’s pretty steady means the output voltage is steady as well.

If you're planning to use these on a solderable or standard breadboard, be aware that the module ac pins have a 5mm separation and will not straddle the center 0.3" dip section. Oddly, some dimensions are close to 0.1" spacing, whereas some are not. By bending the pins severely, it can be jammed in to mount horizontally.