Can I connect this directly to wall current? The transformer looks so small that it makes me nervous

I have 6 of these ( I use the 5 VDC and 6 VDC output models) connecting directly to 120 VAC and potted into older security cameras as these are way cheaper than the batteries. Of course you are responsible for the safety of wiring and packaging as it has open terminals and exposed circuits that will be live AC when connected. It is not designed to be used as is without some type of enclosure which will be up to the user. These are tiny, they fit in the battery compartment of a popular wireless camera that uses 4 CR sized batteries.

Does polarity matter on the ac input?

Since it is AC, it shouldn't matter, unless for some reason you're attempting to do something on the DC side that compares to phase on the AC side (which I hope you're not doing).

Will this power a Raspberry Pi Zero W via the GPIO 5V and ground pins (is power smoothing and conditioning adequate)?

As long as the current rating is adequate enough. It should be OK. The switching noises on these are not so bad.

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Delinx 2Pcs AC DC Converter Module Universal 110V 120V 220V 230V to DC 5V 12V Isolated Switching Power Supply Board (DC 5V 2A Version)

Delinx 2Pcs AC DC Converter Module Universal 110V 120V 220V 230V to DC 5V 12V Isolated Switching Power Supply Board (DC 5V 2A Version)

Product ID: 138604989

Details

Brand
Delinx
Current Rating
2 Amps
Mounting Type
PCB Mount
Power Source
Corded
Specification Met
RoHS

⚡Universal AC 70-277V input

🔋Stable DC 5V 2A output

🛡️Multi-layer protection system

Description

⚡ Power your projects with precision and peace of mind!

BUILT TO LAST - Over 100,000 hours MTBF ensures rock-solid reliability under continuous 80% load.
COMPACT YET MIGHTY - Sleek PCB mount design fits effortlessly into tight spaces without compromising performance.
VISUAL POWER STATUS - Convenient LED indicator lets you monitor output status at a glance.
SAFETY FIRST ALWAYS - Integrated over-voltage, over-current, short-circuit, and over-temperature protections keep your devices secure.
POWER ANYWHERE ANYTIME - Supports wide AC/DC input range (70-277V AC, 100-390V DC) for global compatibility.

The Delinx 2Pcs AC DC Converter Module is a universal, isolated switching power supply board designed to convert a broad range of AC (70-277V) or DC (100-390V) inputs into a stable 5V DC output at 2A. Its compact PCB mount form factor, combined with advanced protections and an LED output indicator, makes it an ideal, reliable power solution for professional-grade electronics projects and upgrades.

Specifications

ASIN	B07SGQ6XXR
Best Sellers Rank	#592,656 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #2,779 in Power Converters
Brand	Delinx
Brand Name	Delinx
Current Rating	2 Amps
Customer Reviews	4.6 out of 5 stars 140 Reviews
Manufacturer	Delinx
Model	PW-12
Mounting Type	PCB Mount
Number of Items	2
Part Number	PW-12
Power Source	Corded Electric
Specification Met	RoHS
UPC	754111085097
Unit Count	2.0 Count

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