DC Power Supply Variable, Bench Power Supply with Encoder Adjustment Knob, Output Enable/Disable Button, Adjustable Power Supplies with USB Quick-Charge, Short Circuit Alam (30V 10A Black)

Just got it, so take that into consideration when reading this review. However, after opening, powering it on, and spending an hour putting it through some initial testing I am VERY happy with this purchase with the exception of one itty-bitty issue (see last paragraph).Obviously time will tell, but it looks and feels like a quality unit. I purchased the 30v-10a unit and after measuring with a good multimeter, the NANKADF accuracy is dead-on below 15 volts and within .005 volts at higher voltages. That's more accurate output than a wall-wart and most PCB power supplies (7805, etc). The encoder knobs are wonderful and let you dial in the voltage/current level you desire easily and error free.I did not find the audible "beep" when turning/pressing knobs to be either loud or annoying as others have suggested in their reviews, however you can disable this although I found the included instructions a bit confusing.1) Press the output button continually until the unit goes into setting mode.2) Press the VOLTAGE button until the AMP number shows "4".3) Turn the VOLTAGE button until the WATT number shows "0".4) Press the VOLTAGE button until the AMP number shows "6".5) Press the VOLTAGE button once more to save the settings and return to operational mode.My only complaint is that after selecting and setting the 4th digit for both the Voltage and Amp displays, the unit automatically defaults to the 3rd digit for subsequent adjustments when it should remain selected on the 4th digit. For example, if I want 25.64 volt output, I select and set the first digit to "2", select and set the second digit to "5", select and set the third digit to "6", select and set the fourth digit to "4". My next turn of the Voltage knob should either increase or decrease the "4" in the fourth digit because that was the last digit I selected. However after a 5 second delay, turning the knob changes the value of the "6" in the third digit and so I have to press the knob moving through the display to get back to the fourth digit to adjust it again. While I don't anticipate spending a lot of time adjusting tens of mV, it is nonetheless a little aggravating.

This is a very useful voltage regulator with adjustable amperage. I used this to recharge my batteries and other projects. When your battery is dead, you will need to bring it up to a certain voltage to get it recharged again.

This variable DC power supply is exactly what I needed. It’s well-built, compact, and easy to use. The size is perfect for my workspace, and the performance is very consistent. It provides stable output and is reliable for all kinds of electronics work. Definitely a great tool for anyone working with circuits or needing adjustable voltage. Highly recommended!

The good design is only let down by the binding post. The controls are simple and easy to understand. Checking the output with a meter and test load shows the display to be accurate. The kit included some basic cables with spade connectors instead of banana jacks. It is not a show-stopper but something to note. The binding posts are basic and a little thin. They are only marked at the base instead of with matching color caps. Replacing them is not an issue with all the connections inside being screwed or bolted rather than soldered. The front and back panels are plastic making it less likely to short things out if you bump an output against the front of the unit. The separate output on/off switch is a nice touch and allows you to turn off loads without turning off the power supply. I would like to see fuses on the outputs as a second level of safety but at this price point, I can't fault them and there is enough room inside the chassis to add them yourself.

top quality minute variable adjustment

Someone mentioned that when you adjust voltage with output on the current would not display actual output. I took a chance on this and it does show live current as you adjust the voltage. Same when adjusting current it will show live voltage. Unit is accurate to .020 on voltage and spot on with current. I also verified it will deliver 10 amps all the way to 30v as long as the input voltage is set properly. Beeping dials can be muted very easy through settings. Couldn’t ask for a better value.