2PCs AC DC Converter Module Universal 110V 120V 220V 230V to DC 4.2V 5V 12V Isolated Switching Power Supply Board (DC 5V 2A Version)

These little rectifier buck converters work great!As adveratized.

I used this in a panel build for a project. It supplies 5vdc to an Arduino, TFT touchscreen and to trigger an SSR (solid state relay).It's small but does the job with no heat output. A++

The output voltage is ~5.3V for my 5V/2A modules.They come in pairs and are quite difficult to break apart along the somewhat perforated PCB boundary.I had to carefully saw/cut/grind halfway through the boundary to prevent the PCB from fracturing or having the electrodes peeled off.I'm not sure if they could really sustain a 2A current as claimed.

They work great to power esp32 boards however they are a little hard to solder onto. The metal strips away easily.

Don't think you can beat these for the price. Make very sure you read the operational specs and know your load characteristics before you buy. These come with both units as a single unit that requires a bit of care when you separate them at the very tiny circuit board joints as this requires care and patients and a good tool with extremely small not aggressive saw teeth; don't recommend trying the use of a simple knife or box cutter as these things are very fragile and any slight error will destroy the soldering pads . Once in service this item can't be beat for the price in my opinion. I have been an Electrical Engineer since 1972 and my opinion is that for the price and effort these beat building your own from components, which is my usual method for a lot of years; just remember to stay withing the operating limits and don't recommend these in applications that require a lot of current regulation and ripple suppression.