Universal Power Supply 3V~24V 3A 72W Adjustable Variable 3V 5V 9V 12V 18V 20V 24V AC/DC Adapter Charger, 100V-240V AC to DC Converter with 14 Tips, Polarity Converter and 4-Way Power Splitter Cable

I got this to help me work on some single board computer (SBC) projects at home. At the office I have access to professional bench supplies, which are expensive. For $18 this does what I need it to do. The following points are for information in case you are looking at this - not complaints, but things to be aware of. I have access to an accurate (Fluke $$$) handheld multimeter at home, not all do.On my unit the voltage displayed on the readout is around 0.1V higher than the actual output. It's pretty much constant regardless of the output setting. So without a load I can set the voltage on the unit from 2.91 to 24.4 volts (indicated) which is actually 2.82 to 24.29 volts (measured). For $18 I can live with that.One thing that may trip you up is that it appears that the output cable uses 24 AWG wire, resulting in a resistance of around 0.190Ω. While that might not sound like much, at the rated 3 amps that's a voltage drop of 0.57V. I've got SBCs that need a 5V nominal supply, and that run some USB connected peripherals. The 5V SBC can draw up to 2A if it's also recharging its backup LiPo battery, so if I set the supply to 5.00V I'll actually be getting 4.92V, and after going through the output cable I'll lose another 0.38V and be at 4.54V going in to the SBC. This is getting very close to the USB sec minimum of 4.40V, which is what goes to the USB-A ports on the SBC via current limiters that introduce a small drop themselves. This can all be cured by raising the displayed voltage to 5.5V, but it's something to be aware of for those that don't have the ability to measure the actual voltage under load.I love the huge array of cable ends that come with it, including alligator clips and a screw terminal block. One occasionally encounters a device that's been designed for some reason with the central pin negative, so the polarity inverting cord is a great touch.The adapter itself is equipped with a 5.5x2.1 barrel which is about the most common used in this voltage & current range - so no adapter needed! As another reviewer noted about the only thing I miss is a 5.5x2.1 to USB-A female but those are easy enough to make up with hand soldering. Watch out for the 1 in/4 out 5.5x2.1 fan out adapter - the 4 output leads are TINY and I would not be surprised (based on voltage drop measured) if they are 28 AWG or 30 AWG so you'll get some serious voltage drop through there on any heavy draw.Finally, at low voltages the adjustment is pretty sensitive, so I'll probably replace the knob with a larger diameter unit. It's got a 6mm splined shaft and the knob pulls off, so plenty of those available.Not sure I'd use it as a permanent replacement but for the bench it's great. May buy more.

Funciona genial pero la perilla no es muy práctica

Excelente fuente de alimentación de VDC, el voltímetro que indica el voltaje es preciso, el kit de accesorios de conexiones es bastante extenso y útil.

This is a terrific adjustable voltage power supply. I was looking for a simple device to power a very basic LED circuit that I made and came across this item. It has been working brilliantly and offers flexibility to use in a number of applications. I have it mounted to a wall in my workshop. It is compact, adjustable and works!

This is an excellent power supply. It provides variable output voltages and very stable DC output. I dialed it to 12 volts which is about what I am in need of. When monitor is on the voltage drops slightly to 11.7 volts and I could adjust it but the monitor is fine with11.7, When monitor is off it is back to 12.0 volts. Because it is variable, you can play with it. The monitor goes off line at 7.74 volts. I like that the display shows the output voltage. I like the stability (purity) of the DC voltage and output is infinitely variable within the ranges and it is 72 watts. Not to mention all the adaptors that come with it.