They run from anything up to 36V and regulate down to a nice 3.3V. They cope if I reverse the polarity. They are tiny (0.4″ × 0.5″). They just work.
They cost a few dollars, and actually cost more than the ESP32-WROOM-32 (at current pre-brexit style exchange rates), but they really just work, and I am using them everywhere.
What I did not work out, when ordering a 100 of them, is that they are so recyclable! I am changing controllers from ESP8266 to ESP32, but the power modules can be easily desoldered and re-used. I have so many I am thinking of listing them on Amazon.
I whole heartedly recommend them, very nice, work well, don't get fried when you cock up.
"I liked them so much I bought the company!" :)
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