does this get hot? would i be able to keep it enclosed in a box?

I haven't measured the temperature, but it doesn't get too hot for my use. I installed it in this box https://www.amazon.com/gp/product/B00E6MZ832/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1 and use it to power some waterproof string lights near my pool. The lights pretty much use the max amperage the unit can provide, and it remains cool to the touch.

My unit started buzzing. Anyone else have that issue?

Something is probably just vibrating in the unit. Remove the top, fire it up and watch to see what component is vibrating. Probably a capacitor or an inductor. Then power it down and add some hot glue to that component. Should fix it. This is all assuming you are outside your return time, of course.

Input polarity? I am noob so please tell me if using with type f socket i have to always make sure that L&N inputs match the output of wall plug?

GreetingsFor the input of the F-type socket, the L & N of the AC line of the power supply is to maintain the connection of the corresponding hole, and do not reverse, so that the power supply can work more stably.

How to power a 8 raspberry pi 4 cluster? Need a terminal block or do without and daisy chain? Or does each each positive negative need to feed to sour

They can be connected in parallel as long as you use wire gauge heavy enough to carry the amperage......which won't be much.

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LETOUR 5V Power Supply 40A AC 110V/220V Converter DC 5Volt 200Watts Adapter LED Power Supply for LED Lighting,LED Strip,CCTV (5V 40A)

LETOUR 5V Power Supply 40A AC 110V/220V Converter DC 5Volt 200Watts Adapter LED Power Supply for LED Lighting,LED Strip,CCTV (5V 40A)

Product ID: 88388977

Details

Brand
LETOUR
Color
5V 40A
Material
Aluminum
Item Weight
1.1 Pounds
Input Voltage
120 Volts 220

⚡40A high current output

🔌110/220V AC switchable input

🔥200W max power capacity

Description

⚡ Empower your space with unstoppable 5V power!

SAFETY FIRST - Advanced multi-protection system guards against overload, overheating, and short circuits.
BUILT TO LAST - Premium pure copper inductors and high-performance transformers ensure durability.
POWER YOUR AMBITION - Robust 5V 40A output fuels your LED setups with unmatched reliability.
CERTIFIED CONFIDENCE - 48-hour burn-in tested and CE/FCC certified for professional-grade performance.
GLOBAL COMPATIBILITY - Seamlessly switch between 110V and 220V AC inputs for worldwide use.

The LETOUR 5V 40A Power Supply delivers a stable 200W output with switchable 110/220V AC input, engineered with premium components and multi-layer safety protections. Ideal for powering LED strips, CCTV, and other high-demand electronics, it’s rigorously tested and certified to ensure professional-grade reliability and performance.

Specifications

ASIN	B07FX8HL79
Best Sellers Rank	#3,441,554 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,863 in Outdoor Low Voltage Transformers
Brand	LETOUR
Color	5V 40A
Customer Reviews	3.7 out of 5 stars 27 Reviews
Enclosure Material	Aluminum
Input Voltage	120 volts, 220 volts
Item Weight	1.1 pounds
Manufacturer	Shuofeng
Material	Aluminum
Mfr Part Number	PS5V40
Model Number	PS5V40
Output Current	40 A
Output Voltage	5 volts
Output Wattage	200 watts

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