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.

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.

The additional cables allow for pretty much anything you could need. The tiniest nudge of the knob can jump you 5 to 10 volts so it's difficult to fine tune to exactly the voltage you want but it can be done if you're careful. My multimeter said the supply was about 1.5 volts off but that is easy enough to correct. If I were using this to power a device I would be worried that something might nudge the knob and burn out my device. I'm using it as a poor man's bench power supply for testing components. I bought a cheap set of multimeter probes and just spliced them on to the end of the supply cord. Now I have a cheap adjustable power supply. (as long as you don't need to adjust amperage)

The Universal Power Supply 3V–24V 3A 72W Adjustable Adapter is one of the most useful and well‑designed power solutions I’ve added to my toolkit. Whether you’re powering small electronics, testing devices, or replacing lost adapters, this unit handles it all with impressive stability and precision. ✅ Wide Voltage Range for Maximum Flexibility The adjustable output from 3V all the way up to 24V makes this adapter incredibly versatile. It easily replaces multiple single‑voltage adapters, and the voltage selector is accurate and clearly marked. Perfect for powering: - Routers - LED strips - Small appliances - DIY electronics - Audio equipment - Test benches ✅ Strong 3A / 72W Output The 3‑amp capacity provides plenty of power for most consumer electronics. Voltage remains stable under load, and there’s no noticeable noise or fluctuation—exactly what you want from a dependable AC/DC converter. ✅ 14 Interchangeable Tips + Polarity Converter The included 14 connector tips cover almost every common device plug. The polarity converter is a huge bonus, making it compatible with both center‑positive and center‑negative devices. This level of compatibility is rare and extremely convenient. ✅ 4‑Way Power Splitter Cable The splitter cable is a standout feature. Being able to power up to four devices at once from a single adapter is incredibly efficient, especially for LED setups, small electronics clusters, or multi‑device workstations. ✅ Universal Input for Global Use With 100V–240V AC input, this adapter works anywhere in the world. Great for travel, international equipment, or multi‑region setups. ✅ Solid Build Quality The adapter feels durable, the connectors fit securely, and the cable quality is better than most universal power supplies. It runs cool and operates quietly even during extended use. ✅ Bottom Line The Universal 3V–24V 3A 72W Adjustable Power Supply is an outstanding all‑in‑one solution for anyone who works with electronics. Between the wide voltage range, strong output, huge selection of tips, polarity converter, and multi‑device splitter, it replaces an entire drawer of adapters. Reliable, powerful, and incredibly convenient. A fantastic buy for hobbyists, technicians, and anyone who wants a dependable universal power source.

Works very well. I use this for testing fire alarm strobes and bells.

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.