Review on 💡 Packed Power: PEMENOL 5PCS AMS1117-3.3V Buck Converter – Efficient 3.3V Step-Down Voltage Regulator for Stable Power Supply (800mA) by Victor Ceja

This is a great little device, but there is actually NO documentation for it. I had to go to the forums to find answers someone found in the docs of a "similar" (but not identical) device. It was a time of fellowship and prayer. I toasted 2 out of 5 to find out. The specific missing information is that when using FIXED voltage settings, the EN port MUST be shorted to ground to get ANY voltage. However, if you are using a VARIABLE output, DO NOT use this port. So if you're having trouble, try these things. The chart doesn't show it very well. To put it simply, GND is common, positive power input is connected to IN+, positive output is connected to VO+, and EN is a switch required for fixed output but forbidden for variable output.