Price was great and performs better than I expected at this price point!

I used this to power an ECM to reflash it. Worked great. It’s small and compact, perfect for a bench top. The power consumption reading is great to see that the ECM powered up and there was no noticeable issues with the connected device.

A great implement for teaching low voltage circuitry to my son

Entire transaction was very good, including delivery. Unit is really good and description and reviews all were a cut above competition. This little unit is doimg it's job as an alkaline battery booster/charger. The current limiter and voltage regulation knobs work great and can give you an idea of whether charge will be accepted. It's not a transformer type setup (pulse?) And works great. Quiet. Just what I wanted. No complaints.

This inexpensive variable switching power supply has a couple nice features that might make it complement other bench power supplies. The first is the front output switch that enables/disable the output power while the supply remains on. This is nice if you are wary of turn-on transients with supplies that have only a main power switch. Being able to have the main power on with the output disabled also allows you to set and verify your output voltage/current on the display before you actually apply it.Another thing that I really like is the ability to set the output current limit with milliamp resolution. I tested this and you actually can safely connect a low current LED directly to the output without a series resistor if you set the current limit to 5 to 10mA.At first I found changing the resolution of the voltage and current a little odd. For example, you push the current encoder to toggle between tenths and thousandths of an amp, but it skips hundredths. No big deal though. And I'm not fond of the main power switch located on the top rear of the enclosure. I keep mine under an equipment shelf with no room to reach over the top, so I just leave it on and use the front enable button primarily.Some high frequency noise should be expected on the DC output as this is a switching power supply and not a linear type with a large transformer. That is apparent the first time you lift it. It's very light.The power supply seems to be nicely designed (see photos) with quality circuit boards. Internally there is a proper safety ground for the mains power and the unit does bear an FCC RF emission certification. However it does not have any UL, ETL, or CE markings that would indicate that it has been safety tested and certified.For general bench use where switching power supply noise is not likely to be an issue, this power supply looks like a decent value.

Fast delevery,works awsum.Will be perfect fot electrolysis with copper crystals.

I’ve been interested in electronics since my very early teens, playing around with old tube radios, transistor stuff, and just fixing and making things where electricity is required.I’ve owned a small number of power supplies, using them for a variety of power needs, including my radio equipment.In all cases of the ‘variable’ power supplies that I have used, the only adjustment has been for the voltage. The design of the transformer and related circuitry determines the current (amperage) capacity and is not generally adjustable, letting the device draw the current it needs up to the limit of the power supplies capacity, even if it means overloading, as if a short-circuit occurs in the device.This Hyelec HY3005B is a bit different in that it does have a control for setting a limit on the current. Excellent when powering a circuit that you may be trouble shooting!The HY3005B is adjustable up to 30 Volts at 5 amps. It has an excellent digital display showing both voltage and current output, simultaneously. There are LED indicators to show if the supply is in Constant Voltage (CV) or in the automatic crossover to Constant Current (CC) modes. (Read instruction 2.2.1 in the User’s Manual for description.)Both the Voltage and Current adjustment controls are unusual from my experience, in that they are two-stage controls. Rotate the control knob and the whole value will flash on and off quickly until you reach the value you select. For example 5 Volts. The decimal does not change while rotating the control. Pressing the button for a quick moment, switches the control to it’s decimal value, and turning the control then flashes on and off quickly the decimal adjustment. For example 0.01 Volts. The adjust for limiting the current (Amps) works the same way.There is also an Output button, which, as I understand it, shows the actual voltage and amperage that is present at the terminals and being drawn by the device you are powering. Honestly that is a feature that I don’t fully understand at the moment, but it appears to me that you can set the voltage and set the limit on the amperage you want to supply and it doesn’t convey to the terminals and your device until you push the Output button. When that is done, the LED display indicates the voltage and the actual current that is being drawn by the device.The instructions provide a brief but adequate explanation of the operation and safety factors built into this power supply. While I understand its functions, I admit that I need to do some further reading.Overall, this is a pretty nice adjustable power supply. But note that it has some uncommon features for me, and in my opinion it is suited to circuit trouble shooting and not just to power your radio or other simple power needs.The circuitry is overload and thermal protected with a fan at the back of the enclosure to aid in cooling the circuitry. The power on/off switch is located on the top, left side of the back panel where it is easy to reach, and the fuse cover is located just beneath the power cord receptacle at the bottom of the back panel.On the front panel you will find the LED panel, indicators for output mode, controls for setting the voltage, amperate, and output. At the bottom there are terminals for as described above); and,Output terminals are negative (-), ground, and positive (+) connections. The terminals will take plugs or wire connections and a pair of plug/alligator clipped cables are included.Excellent power supply, well designed and suitable for most circuit work I think. Now excuse me while I do some reading to learn about that current limiting feature.

It works well and doesn’t take up much space on my workbench. Also, VT is consistent. Overall, good “less expensive “ alternative to others.. I wish the US could offer a competitive alternative.