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Tiny little power supply, huge usefulness.

HLK-5M05 takes 220V AC and spits out 5V DC at 1 amp — 5 watts total.

Isolated, compact, potted, ready to drop into your project.
Great for ESP8266, Arduino, or any 5V gadget you want to run straight off mains.
Unbranded generic but brand new.

MPN is HLK-5M05.

No weird noise, no bulky transformer.
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Just solder your wires and go.

If you build smart home stuff or controllers, keep a couple of these in the drawer.
4.5 out of 5