HiLetgo 10pcs AMS1117-3.3 Power Module: Efficient DC-DC Step-Down for Reliable 3.3V Buck Conversion - LDO, 800MA Review

Used to convert my LCD2004 screen that came with my ANET A4 to work with my SKR v1.3 as my SKR had 3V input and the normal LCD2004 had 5V output.

used to hide 5-3.3v for my weather radio than run on AAA batteries. Used a spare USB, cut off the ends, pinned this step down and connected to the wireless terminals. could place the module in the battery compartment.

They work great for dropping 5v down to 3.3v I suspect the negative reviewer didn't hook them up correctly. The pinout is different from the standard 78xx-TO-220 packet LDO. From left to right on the LED and pins page, the pinout is Vin, Vout, Gnd.

As with the 1 star review, the very first one I tried only put out the unregulated input voltage. I checked my pinout and tried the second block of ten I bought and it worked great. 2 stars because I can afford to test every one and even if only a few of them work it was worth the price, they can't be trusted.

This is the same linear voltage regulator used on the NodeMCU board to power the ESP8266 with 3.3V from Vin. I use this small board to power electronics that need to communicate with the ESP8266 at 3.3V when placed in another package far apart or when current requirements are too high. The PCB design is solid and the form factor is quite small. The built-in LED gives good feedback so you know when the device is on, but you can remove it if the battery is dead and you want to save power.