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I power my RPi 3B+ from a PS sold & distributed by "The Foundation" (i.e. has the RPi logo embossed on it). I also have a Western Digital "Passport" USB drive that I've connected to the RPi USB port & use as a file server for my Sonos system. I've never had any power/undervoltage issues. I'm posting this because it's possible your issue is related ...


My PSU is a 30W 3USB ports Aukey supposedly able to deliver up to 2.4A per USB port But that's not really a PSU; it's a battery charger. USB chargers are generally not intended to be (or sold as) power supplies. This is an important distinction because live electronics without a battery of their own (as opposed to a phone) will draw a rapidly fluctuating ...


Use an USB cable and make a power line with it. Then put it in the power port of raspberry pi 3. To make such converter use a multimeter to detect the polarity then set up the whole thing. But my recommendation is to use a 3A PSU so that raspberry pi wouldn't fetch more power than it needs,


Thanks to @tlfong01 and some further searching, I learned that there is such a thing as "technical" and "actual" voltage. The wires were placed correctly - the "problem" was just that the wires had to be switched around.. I initially didn't want to try that, fearing I might break something, but it turns out that my fears were unfounded.


If your setup will allow, please use a powered usb hub. The Pi will push the wifi dongle and k+m easy. I've never hooked up a camera but I would image that the pi is getting close to it's max power draw with all of that plugged in. It would be helpful to just add the powered usb hub so that the Pi is not in danger of losing power when operating. Like ...


I've successfully powered a Pi 3B+ using a cheap 12V 3A wall wart from aliexpress and a cheap buck converter from aliexpress. The 12V 3A provides for well above 3A when dialed down to 5.1V through the buck converter. The most difficult part is soldering wire on to a USB plug.

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