Acxico 5Pcs Board Module Mini AC-DC A1367 V1368 AC-50270V DC70-390V

I love that this power supply is super small and will fit inside any enclosure that I 3D print for my IOT devices. I use, primarily, ESP32 & 8266 with various sensors to build smart home devices. Most of the devices won't operate for very long on battery and I started running out of 5 volt USB chargers for them so I ordered these. I usually have access to line power in areas that I install these little guys. Now...power is incorporated to each device. I do not recommend building and installing any mains-powered device if you don't, thoroughly, know what you are doing! I have been doing electrical engineering level work for a very long time and have a complete understanding of potential failure causes and corrections, as well as, mitigating possible fire/shock hazards as the result of DIY electrical devices...EXCELLENT PRODUCT!

Have used these to substitute battery boxes for fairy Xmas LED lights...battery changing gets too expensive during normal Christmas season (I deploy probably 20 sets of LED lights; 120+ batteries used each Xmas season...and the hassle of changeout inside set Xmas displays). Found the boards well made; input and output labels quite clear and easily soldered to. Best thing is the green LED which lights up when in use so don't have to keep using DVM to test. LED also serves to indicate when wiring to low voltage is incorrectly reversed...LED won't light up. Nothing shorts out but no DC voltage flows and LED not lighting is a great indicator! I've got about 8 more set-ups to convert for next year and will use same product.

I bought two bedside lamps with two USB ports in each. [https://www.amazon.com/dp/B089S1THC7?ref=ppx_yo2ov_dt_b_fed_asin_title] Within 3 months, all four ports had died. I took them apart and went searching for a replacement module. The pic with one circuit board in it is the dead original. The pic with two boards is the new ones in the old one's module case. These circuit boards fit the bill perfectly. They are in the lamps and working. The only down side is that they are a bit weak. They are rated at 5V output at 700mA but connected to 116VAC, they make at best barely 3.9V. The best performance I measured was 3.8V at 400mA out to the device being charged and 3.86V at 300mA out.. So they will charge a phone or music player, etc. but very slowly. If they could put out a solid 5V at 700 mA as advertised, I'd rate them 5 stars. They get only 4 stars because they work, just not as well as they should.

I bought these because I wanted to add some cooling fans to a prototype station I built decades ago without tapping the existing power supplies. After a little measurement and thinking, I found a good place inside my already packed device to locate one of these and wired it up to power two internal cooling muffin fans. I just connected this to the ac line upstream of my power transformer. The service line level input is very convenient. The units are small. Very company so great for space savings. And they’ve been powering the fans without any issue. Saved me a lot of time from redesigning or modifying my existing circuits.

It IS unusual to see so many useful comments on such a cheap piece of [foreign slur]. Based upon them, I took the chance of ordering five pieces to see if they’ll work for me - I intend to simply use them as voltage sensors on furnace circulator pumps; if the pump is on (115VAC) I just need to see an output to an Arduino Uno lower than 1.0 or higher than 3.0 for false and true. I’ll run them each for a while at a few milliamps load to see if they’ll explode on me - thanks to those reviewers for alerting us to the effect! Has anyone any experience to them failing-ON (worse: input voltage on the output)? I would assume any failures would result in a fail-OFF condition and that the AC input won’t fail to a short-circuit(?). I’ll probably include tiny fuses to the in/out lines just to be safe. HAS ANYONE SEEN A SCHEMATIC FOR THIS PRODUCT? Buying something from [that country], I always like to ‘know my enemy’ and see how the thing’s constructed (and save myself the time tearing one apart for analysis). I’ll update my review depending upon how the units perform.

I like to power the filaments in my tube amp projects with dc voltage. I used these for an 01a tube project (first commercially available tube). It worked since they only draw .25amps. However they were a bit noisier than I would have liked. I’m sure they fine for less sensitive projects. Keep in mind these are rated at 700ma and they are tiny!

I used these power supplies with micro USB pigtails to "hard wire" some Wyze cams in for our new chicken coop. I used 22awg wire for the 120VAC side because Wago (lever nut) connectors accept 24-12awg wire, and the 22 gauge fit nicely through the holes in the power supply board input contacts. So far, working great on 2 Wyze v4 cameras.

So far, of ten of these I ordered, one was DOA, and I haven't tested all of them yet. And they came some still connected in one strip, mixed with bits of scrap PC board, they hadn't even bothered snapping them apart and just packing the individual units. The price was very low, and if I get 6 good ones out of the ten I'll be able to complete the job I'm working on, but not impressed at all with their quality control. If you plan on using these, buy extra! You'll probably need them after doing their QC for them.

Lo recomiendo ampliamente.