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Reviewed in the United States on February 6, 2025
I’ve been watching Rossmann for several years and fixed a few easier soldering jobs on some MacBooks, but my own died recently and I wasn’t able to figure out what caused it. Decided it was finally time to bite the bullet and get a power supply, and this worked out perfectly. Was able to inject voltage at an amp and quickly see a capacitor getting hot with my little thermal camera, and order a replacement and fix it! Now I’m thinking of other things I can use this for, next on my list is fixing up some old power tool batteries that won’t charge, seems manually charging the cells is safer and this will work well for that too.
Bryan C. Tewksbury
Reviewed in the United States on January 22, 2025
Using this neat little machine to fix some batteries and do some electro plating / precious metal recovery. Controls work accurately, it's lightweight, and fits on a small shelf. I enjoy the extra ports for USB. I haven't had any issues in two runs, several hours of sustained use. So far, worth every penny.
Aatif
Reviewed in the United States on January 16, 2025
I got this because I have needed a way to test DC devices and I’m always rigging up batteries or chargers to get what I need. I’ve finally decided to do it the right way and get myself a proper power supply for my test bench.This device is tiny so even a small workstation could support it.Would recommend!
Ravanja
Reviewed in the United States on May 19, 2024
*** edited to add ***Oct 19th 2024I pulled out the power supply to test a linear actuator. The power supply blew up. This is now the second one to do so. This one had no buzzing sound, it just failed on the initial surge current to the 12 Volt motor.A power supply needs to be reliable. Failing on normal operation is a manufacturing problem if it happens the same way to different power supplies.I can no longer recommend this at all.As promised, if the second one failed I'm updating my review.I'm changing my review to 1 star. Cannot depend on it.My other power supply from a different manufacturer has worked far longer and under worse conditions without any issues. My reliable power supply is a Kungber (old style without the battery charging mode) SPS3010 and it has not let me down. It is just a few dollars more right here on Amazon and a far more reliable product.***********************The first unit I had blew a fuse while testing the short circuit protection. Went out with a bang, dimmed the lights and made bad smells. It also buzzed a lot while delivering current so I'm thinking it had loose transformer windings and other issues.It was returned and the new one was tried the same way. This time, no noise, no blowing fuses and it just worked.I already have two variable power supplies of different types at home. At work I have some serious supplies, 12kW 0-400V AC/DC and arbitrary waveform with multiple phases. So I'm not a novice when it comes to power supplies.This unit is extremely accurate for voltage. It can be seen that it is not far off 1 LSB on my multimeter most of the range. The error is just as likely to be the meter as the supply. It has not been calibrated.The display on this unit is easy to read. The values are easy to adjust. I personally do not need the level of accuracy that this supply provides. I will stress that I have not tested it under load conditions, though that should make little difference to the readings.It is light, good looking, as in it doesn't look like some backyard hobbled up unit. I'm impressed. For a 10Amp 30Volt power supply, this has great performance for the cost.My only concern is the failure of the first unit. Maybe a bad luck sample, but it could also point to quality control issues. The particular sample I have now however performs flawlessly. Should that change, I'll revise this rating.The noise is primarily switching noise about 230mV peaks with 50uS or so period. So about 20KHz switching frequency at no load. I haven't done load testing other than short circuit tests to ensure it delivers the rated current, which it does.For a $60 power supply, the testing I already did tells me it is worth the money. You can do far worse than this and spend more money at the same time. There was no issue returning the faulty unit I initially received so that is a plus and I'd suggest stress testing it to make sure it doesn't have some weird fault if you purchase one. It is rated to provide protection against failures, so test them is my recommendation.
Festus
Reviewed in the United States on December 28, 2024
Over the years I have had to test different electrical and electronic devices by using batteries or different setups. This has mostly eliminated the need for this. I tested the output, at different voltages, with a calibrated Fluke 289 meter and found the output to be spot on. I have also used this to “wake” dead batteries when a battery charger wouldn’t recognize the battery. Excellent value.
G9195
Reviewed in the United States on December 2, 2024
Useful for testing the functionality of small electronics and diagnosing power-related issues. Allows for fine tuning of both amperage and voltage with over current protection for peace of mind. It's a modestly-sized unit and doesn't take up too much space. The power cord is detachable and uses one of the standard appliances NEMA cords. The leads are a little loose when plugged into the unit, but maybe that's by design. Added ground if desired. Leads feel to be of good quality and have ample length. Interface is easy to use.NOTE: The knobs are also buttons!For some bonus, includes fast charging USB capabilities built into the front which I guess is a nice tough though not necessary.
rferg
Reviewed in the United States on December 12, 2024
It blew its' line fuse so I put a new fuse in it. It immediately blew that one. I bought this power supply back in the middle of August and it was out of the return period.I noticed a sound like a screw rattling in the case so I tool the case off. I found that the varistor had self-destructed.I hope that I can find a replacement for the component labeled "NTC1". It may be that it will come back to life if I replace it.Maybe the vendor will volunteer information about this part when they see this review.Attempted repair by replacing the NTC1 5D-15 with a 5D-20. It still blows fuses so I suspect that a power mosfet has shorted.I have received an offer from the vendor for a refund or replacement.
Chris
Reviewed in the United States on November 25, 2024
I recently purchased this DC power supply. This power supply is nice and compact It's got nice big lettering for your amps and voltage. It's rated for 30 volts and up to 10 amps, and there is two knobs for amps two knobs for volts one being the fine adjustment and one being a course adjustment. The functionality of this little thing is perfect, it's very versatile and easy to use, great value for the money.
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