Mini Step-Down Power Supply Module, Intelligent Home Switching Power Module AC-DC Isolated Power Module 220v to 3.3v, HLK-PM03 DC Power Module AC DC Converter 220V to 3.3V（3PCS）

All three modules work. Each outputs exactly 12V from 0mA to full load (tested at 50mA full for my project). Each runs warm only, and there's no audible switching noise. I have a 100nF cap. on the output for filtering out any high frequency noise. As the manufacturer recommended for input protection, I put a safety(X2) cap. in parallel with a transient voltage suppressor across the 120VAC mains input. Also, I added a fusible resistor. Input protection may not be necessary, but I did just because I had these components. Anyway, so far I impressed with the SMPS module. It delivers a solid 12VDC, is efficient and isolated from mains AC. I have recommend these modules for those looking for a very small, 120VAC to 12VDC power supply.

Good product for the price, really. Not an instant supply when turned on, takes about a second and slow drain when off if that is an issue for your project. Someone here says is not breadboard friendly. It is, with a small modification. The supply rail of the breadboard is most likely continuous supply of power along the breadboard. You only have to snip the track underneath the bridges like sections on one end of the breadboard the mini power supply will fit perfectly sideways with the dc prongs on each side of the bridge

Bought less than a month and tried one with a laser diode works out pretty well so far. Will see how long it goes. Based on the light condition, it’s pretty steady means the output voltage is steady as well.

Works as advertised.

Great supplies, compact, work well

Muy bueno

The pins don't fit in a standard perf board. I'm not sure how you are supposed to use it. The only way is to solder wires straight to the pins. Not good if you ask me. Other than that it seems to work well.

Compact design -eliminates bulkier transformers in linear power supplies.

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