AC 110V/220V to DC 12V 5A Universal Regulated Switching Power Supply Transformer Adapter LED Driver for CCTV Camera System, Radio,LED Strip,Pixel Lights,Raspberry PI Models,

as described - excellent

I purchased this unit to operate ham radios. While the voltage does not adjust quite high enough the circuit board is easily modified to accommodate a higher voltage output. It lasted for over a year operated in very harsh conditions.I ordered another to after the first one finally failed but the unit case was damaged. I only needed the circuit board so kept the unit. It has operated in less harsh conditions for more than a year now. I regularly operate the unit drawing 3 Amps constant for hours and when transmitting if produces a stable 17 amps in my application.I ordered a spare and again it came damaged, with missing screws, the return and replacement unit happened quickly but again the replacement unit case was damaged (good thing I don't need the case)The circuit is a great value and very reliable but beware of possible shipping damage it happened to me three out of four times.I do recommend the unit for its performance.

The voltage is adjustable and has sense leads, so you get 5.1 volts at the load. You will need some USB female connectors if you do not want to hard-wire the power leads to the Pi or shield. You will also need a line cord (and switch so you wont have to unplug from the wall).

This 5v 12A supply arrived in good shape with no damage and was set to 5.1v out of the box which is reasonable.It has worked well for the last month, but I’ve only put about 5A of load on it. At that level of current, it runs cool so it is reasonably efficient. Internally it looks similar to other “frame” style supplies with old school through hole components. It is fused and the heat producing semiconductors make good contact using thermal compound. I’ve purchased similar power supplies that come with no thermal paste and poor frame contact so this was good to see. There is an input filter, L1/CX1, which should keep any noise from back feeding into the power input.The adjustment resistor goes from about 4.9v to 6v. I would have liked to see a tighter range than a full volt, 4.8 - 5.3v would be better. Most people won’t care, but I always worry that a bump to the potentiometer could cause it go too far out of spec. No doubt one could fix this if they want to go through the effort and have the expertise. I’ve done it on other supplies and it usually requires changing one resistor and the potentiometer.I would recommend this for those that have the expertise to test/set the voltage, and can safely wire it to mains power.

I bought this power supply to supplement the 12 volt supply for my 3D printer. it is tied to the pre-switched AC side of the circuit, just after the fused power switch/inlet. The primary purpose of the unit is to power the Raspberry Pi hosting Octoprint. The Pi + night vision camera really suck a lot of power that no combination of USB cable/wall wart could supply.The unit itself is tiny and after some planning, I chose to mount it under the bed. I ended up designing and printing a bracket to side mount it to the V-slot extrusion of the printer frame. The flap over the screw terminals does a decent job of protecting your hands from accidentally getting shocked, although a piece of electrical tape might help if you're still worried. It has an adjustment pot on the side of the terminals that I used to tune it to 5.1 V which the Pi seems happy with. It also has a little green LED indicating it is energized. Being passively cooled, I was worried it might heat up but I can confirm it stays cool to the touch regardless of what the Pi does.Overall, for about $10, I think it finally solves an issue I've been dealing with for ages with OP. It also gives a bit of headroom if I want to add other 5v accessories like a set of LEDs.

This is a basic switching power supply without any embellishments like cooling fans or overvoltage protection. It's a fuse protected rectified line side arrangement with switch mode bucking topology. All what you would expect at this price point. The design is minimalist, with only what is needed to get the job done, and that's fine for the price point. Being Chinese made with non-premium components (no Sprague, Dale or Ohmite here), the lineside capacitor is a 100uf 450v Dongbaohe brand, with 5 x 1000uf 16v WCO brand as final DC filtering. Despite being minimalist, it's well executed, with good build quality. Soldering is well done automated work with a generous amount of solder fillet on all leads. Long term stress cracking shouldn't be an issue as is common on some of this style PSU. I wouldn't use it in an industrial or any critical application, or use it to power equipment which could be damaged by overvoltage or excessive noise, but for hobby, shop, LED lighting or experimental use, it should perform well.The power supply came out the box adjusted to 5.02v, and holds it's output well under load. At heavy loads, it produces moderate heat, with little concern for overheating as long as it has good airflow available. I would mount it vertically if possible to take advantage of convection. If installed in an enclosure with limited air circulation, derating would be advisable. Adding a 5v fan would be a nice improvement, as would some additional output filtering, and an output fuse. All could be done quite economically.For it's niche, this is a really good value, and I plan on keeping at least one on the shelf for when I need a quick 5v PSU solution.