Electronix Express SP-1305D Single Output Linear DC Power Supply with LED Display - Voltage Adjustable 0-30V and Current Adjustable 0-5A

I use a number of different types of variable voltage bench power supplies. I run a small company and we cannot afford top of the line equipment and we do not require government calibrated units. My company works on electronic and software designs and I have not only used this unit extensively I have also taken the cover off and looked at the internal design, not because there was an issue, but to compare it to a similar looking unit that had a very bad design which failed hence needing to purchase this replacement.We use these PSUs to power small dc devices that we need to test at a specific voltage and current. In most cases we are running at fairly high percentage current draws of 3-4Amps and switching the equipment on and off repeatedly throughout the day. Although we always ramp the voltage up before turning it on and down before turning it off, the unit gets a lot of use perhaps 20 -30 cycles a day.To date the unit has proved reliable and although the heatsink gets warm, there is nothing cooking under the hood and the unit reliably and consistently delivers the set voltage and current required for the tests. Inside the unit is professionally manufactured with a well thought out layout, good circuit design and professional component soldering and connections unlike some other similar units on the market.Overall I am very pleased with this PSU, consider it good value for money and would recommend it to others.

The current limiting LED is permanently on and in fact no power is delivered. We checked the fuses but spending any more time on it than that would cost more than it's worth. I ordered two identical units. The second works but the current display goes in and out for long periods. When it's out it's back-lit but there is nothing displayed on it.

I purchased this power supply as a general purpose bench test supply. It's not bad for the money. It does a decent job of regulating. The displays are big and bright. (My LCD's light up with white LED's backlights.) The Volt meter is OK considering they are only accurate to +/- .1 volt. I would not expect the current to be terribly accurate. But it does a decent job of letting you know approximately what voltage and current is going out. (Probably better than most analog meters.)I put a 24 volt DC blower on the supply and ran it at 24 VDC at about 1.95 amps for 30 minutes. The unit gets pretty warm. I could smell the "new electronics smell" burning off inside. The heat sink on the back got up to the point I could not keep my hand on it. Not sure I would attempt to pull 5 amps continuous out of this power supply. Like most generic Chinese electronic devices you should expect about HALF of the rated specifications... I think it would be OK for 2.5 amps continuous... Not 5. But that it to be expected for a "bargain" linear power supply.Overall this is a nice quiet compact bench power supply. Just don't over load it.

I bought this on the recommendation of the reviews here, and I'm not sorry I did. Everything was as expected. The unit is heavy, with a large heat sink, and everything about it seems well-enough made for the price. Comparable supplies from name-brand companies will cost hundreds more. Mine came with a strap-style carrying handle on the top, whereas the picture doesn't show one. It's a plus. I don't know if they all come that way or if it varies.I do agree with Eric's review regarding the "coarse" and so-called "fine" adjustments. "Less coarse" is a better name for the "fine" adjustment. You can get what you want but you have to work the very touchy knobs quite a bit to get it there. It doesn't provide "ease of adjustment" despite claims.And, the current control is indeed a current limit adjustment when in constant voltage mode (ie normal operation). I am wondering why one reviewer stated otherwise.All-in-all, quite serviceable. A remote voltage sense input would have been nice -- I bet it's an easy hack to make. I'll find out after the warranty runs out :-)

The power supply works the way I expected. It's not as good as a bench supply but they cost much more, for the price this is a good supply. I use it mostly to charge maintenance free batteries, you can't put water in them so it's important to set the charging voltage and current to the correct values. Even my fancy computerized battery charger sets the voltage to high which causes the battery to gas and use up the electrolyte faster then it should. This power supply being constant voltage and constant current with nice accurate meters fits the bill nicely.

This unit is great for manufacturing a strong oxidizing agent used in fireworks called potassium perchlorate. It can also be used for making potassium chlorate, which can be used for both fireworks and high explosives.Hopefully the government doesn't ban these little units because of their ability to make these substances. It's amazing what this little unit can do when you pass its pretty little current through a super saturated solution of common table salt (its oxidizer city, baby!).I give this unit five stars because it does exactly what it was advertised to do and I didn't have to do any modifications to this unit to get set up and make these chemicals.Thank you Mastech!

While low cost, this power supply was a good choice for powering 0-30V LED arrays of different configuations and assessing power draw, especially for higher voltage arrays such as 24 and 28V. Current and voltmeters agreed within 5% or so of the readouts on this unit and I observed less than 2-3% ripple on my oscilloscope. This appears to be a good choice for a basic power supply.

fake part from tekpower do not buy this its fake chinese copy that will burn and break you job.