Interesting. When searching around for power supplies for the Raspberry Pi, I found this Hackaday article about fake Apple power supplies causing Raspberry Pi board failures. Watch out. As it seems, virtually every single hardware component involved in the smartphone supply chain has a higher risk of fakes and counterfeits than electronics used in other applications. Of course, because smartphones are the biggest market: if the con artists are going to steal from people, they might as well steal from the biggest market.
That being said, if you have a colleague with a spare Apple 5W power supply sitting around on their desk unused, make sure you go for those first before you try buying. Chances are you’ll get higher quality out of that than buying off the Internet. Or, try to find one of those doodads in a local store like Walmart.
20180825/DuckDuckGo raspberry pi fake power supply hackaday
20180825/https://hackaday.com/2012/10/10/raspberry-pi-foundation-looks-a-counterfeit-apple-power-supplies/
Also, I found this interesting article about the internals of the Raspberry Pi PoE Ethernet jack. It has integrated transformers that can be repurposed for radio transmission circuits. Keep that in mind if you have old Ethernet devices around.
20180825/https://hackaday.com/2018/06/01/raspberry-pis-power-over-ethernet-hardware-sparks-false-spying-hubub/