DC 5V 40A Power Supply, PHEVOS AC 110/120 to DC 5V 200W Universal Switching Transformer Adapter for Raspberry PI Models, CCTV, Radio, Computer Project, LED Strips Pixel Lights

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.

I've been using this PHEVOS power supply for a few months now to power my Arduino, servos, and servo testers during development, and it has worked perfectly. The material is good, and the fact that you can regulate the voltage is a nice feature. It's also very versatile, and can be used to power a variety of other devices, such as CCTV camera systems, radios, LED strips, and pixel lights. Overall, I'm very happy with this power supply. It's well-made, reliable, and versatile. I would definitely recommend it to others. Pros: Well-made - Reliable - Versatile - Voltage regulation Cons: - None that I can think of Would recommend: Yes

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 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.

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.

the guts are higher quality then i expected, but havent seen a psu looking like this one in some time. It reminds me of the psu's i used to harvest compenents for guitar wiring circuits from in the late 90s/early 2000s. Nice to buy something im confident i can repair should anything go wrong for once. Seems to be delivering a stable 12.1v 10.1 amp out of the box according to the meter. It survived a faulty step up regulator that destroyed some of my other equipment as well, and was an a** pain to figure out. (see my review on the dajunguo tda7498e 2.1 amp for details on that squirrely process. Will absolutely be replacing the fan on this unit, its very noisy and im using the psu for audio amplification purposes. Thats my only complaint so far.

These little power supplies are everywhere these days, but they are not all the same. These are super quiet, cool and are pretty consistent voltage wise. No fault of Amazon but one of the edges did get bent in shipping, I just simply bent it back and it's good as new. Pro: Super affordable power supply in a small package. Con: Highly unlikely to work at a usable duty cycle at full draw. I ordered a 30amp, used with a Anytone quad six and had no problems at all(that radio draws around 20 amps at full output. In conclusion, these are great little juice boxes for the money, just buy the next highest rated unit than what you would normally need.

The power supply works however its misleading if you think your going to power a full virtual pinball machine addressble LED setup with a matrix etc. The problem here is the amps. The 5volts is perfect, especially for the addressble LED strips they are talking about. However, if your building a setup for your virtualpinball machine, you need a power supply with more amperage. A quick way to figure out how much you need is just count the amount of LEDs in your entire system and multiply it by .06. If your using the proper LED strips for the two side tracks that run up and down the sides of the playfield you should have the strips that have 144leds each. A normal matrix has (8 x 32)256leds and thats if you only want a small centered matrix. To have a matrix which goes from one end to the other of the back of your table you'll need approximately 22-23inches. Usually that requires adding two 8 x 8 (64leds) square matrix add ons. If that was your setup , you count the total leds and multiply it by .06 and you'll need a power supply that is putting out approximately 40amps. I have 4 speaker rings with 96leds each and was trying to use this power supply to run them. Until I did more research and used that simple math equation I couldn't get them to work. Now I got one that's 5volts AND also the correct amps. I hope that helps some of you who are buying a power supply for a virtualpinball addressble led setup.