DC Power Supply Variable (30V 5A), Mini Bench Adjustable Switching Regulated Power Supply with Upgraded Encoder, High Precision 3-Digits LED Display Lab Power Supplies

Easy to use, understandable instructions. You need to call up the settings you put in when you turn the machine off but it seems to remember them. Display is clear. A few button presses gives the volts and amps to give the power setting you desire. Nice and compact. The image shows the lighter areas of the aluminium discs which is the etched parts, the vinyl decal is the darker areas. I’ve a chemistry background and have reasonable confidence but I think it’s still it’s worth using low settings and work up for safety reasons.

This is a great little power supply for novice user. If your just learning or experimenting with electronics its worth the money. A little noisy with the rear fan but nothing to right home about.

I bought this little power supply for home and hobby use. The unit functions well, seems reliable, and the output voltage (which I have checked) is both stable and acceptably accurate. It is not to be compared with laboratory standard instruments but they cost much much more. The display is clear and adjustments are simple and logical. In use, there is a certain amount of noise from the internal cooling fan and this fan is not regulated - that's to say, it runs all the time, regardless of the actual temperature inside the unit. Conclusion: good for the price point, recommended.

For the price it was worth the gamble to go for a completely unknown brand. When I got it it looked decent enough. It works fine. The fan being 50mm is average loud, definitely not silent. I opened the cover and I was pleasantly surprised by the very good build quality. You set the voltage and current limit digits by clicking and turning where a click goes to the next digit. I am very impressed so far. Would love to see higher voltage versions when these get cheaper. All I am missing is a ground connection. By the way, the cover is grounded, less that 0.1 ohm. If you are thinking of one, it's a yes from me.

It is a very nice power supply, easy to set the voltage and current. But the noise of the fan is intolerable: not very loud but a persistent iritation. Sending it back

I bought this as I had a variety of batteries at different voltages to charge. So far, this is working great for that - it's brought back a few dead/non-charging batteries and I can also use it to power a tool that requires a certain voltage. Only a bit more expensive than a high-end charger that would only do one thing - very pleased.

Am using this to power my 7.5ft GE Christmas tree whilst looking for a replacement plug and contol unit which i didnt know was faulty till i had decorated whole tree and switched on,as the tree is useless without it, the fan constantly runs but is not loud and with all the other sounds in house is not noticeable, very small and build quality is very good will use for other things, so glad I bought it,price is cheap,compared to buying another prelit tree, has got me out of trouble .Highly recommended,

I bought this for some experimentation with different circuits. It gets the job done, is adequate for supplying the right voltage if the circuit is left unconnected until a little after the button's pressed and it's powered up. Also can't go wrong with the lower price compared to others. However, would advise against powering up with a complete circuit when using sensitive components, even at low voltages. When testing with n mosfets, it keeps breaking them at the point it's turned on and ramping up the voltage. This has happened at 5v and 24v for IRFZ44Ns connected between drain/source. I'm not experienced with electronics, and don't have an oscilloscope, but it's a simple circuit that to my knowledge (and my multimeter's) should be working fine. Furthermore, a fixed power supply at the same voltage does not break my n mosfets when put in the exact same circuit, so I have to conclude that it's the power supply causing the issue. I think the main cause is that because it's variable, the voltage in this ramps up. Maybe some kind of voltage/current spike when the supply is turned on (voltages are certainly fine when tested with a multimeter after it's been running for a few seconds)? Or maybe the fixed supplies I tested it against have better circuitry in place that counteracts any bad decision making on my part. Not entirely certain, what I can say is it's breaking my components at the point it's turned on where other power sources aren't, so if using sensitive components maybe make sure to only complete the circuit once it's fully powered up and the voltage/current readings have stabilised a bit (Or use some extra component like a zener diode to protect your mosfets - this worked in my case).