DROK Adjustable Voltage Regulator DC, Buck Boost Converter 6.0V-36V 9v 12v to DC 0.6-36V 24v 5A Power Supply Panel, Constant Current Volt Step Up Down Module

This device fits a need I have for a variable power supply. I have a number of fixed output power supplies that I used with my amateur radio equipment but needed a variable supply. First the physical format was just what I was looking for. It is small (4.2 x 2.7 x 2.4 inches) yet the display is large enough to easily read. The case has tabs on the side so that it can be mounted in a box or cabinet without having to use any mounting hardware. The connector are properly located so that connecting it up is very easy. It has a lot of options for setting the voltage output and current. Setting these parameters is quite easy and can be done quickly. There is a button to turn the output of this device ON or OFF. The input can vary from 6-55 Vdc and output of 0-50 Vdc. You can read the other parameters in the ad above. When the dc to dc converter is used to charge a battery or to be capacitive load, it must be in series with a diode, or the module will be damaged. A power diode is included in the kit for this purpose. Below are some of the measurements I recorded.Input voltage = 18.8 VdcLoad was a 10 ohm 1% 5 watt resistorTest 1:Output set to 9.10 Vdc at 1.0 AmpsMeasured output: 9.07 Vdc at 0.887 Amps on device display and 9.01 Vdc on separate meterTest 2:Output set to 5.00 Vdc at 1.0 AmpsMeasured output: 4.99 Vdc at 0.491 Amps on device display and 4.94 Vdc on separate meterTest 3:Output set to 2.50 Vdc at 1.0 AmpsMeasured output: 2.49 Vdc at 0.243 Amps on device display and 2.48 Vdc on separate meterTest 4:Output set to 8.00 Vdc at 0.40 Amps (for contant current)Measured output: 4.07 Vdc at 0.40 Amps on device display and 4.00 Vdc on separate meterTest 5:Output set to 8.00 Vdc at 0.50 Amps (for contant current)Measured output: 5.08 Vdc at 0.50 Amps on device display and 5.01 Vdc on separate meterTest 6:Output set to 8.00 Vdc at 1.0 Amps (for contant current)Measured output: 7.98 Vdc at 0.78 Amps on device display and 7.96 Vdc on separate meterNote that the voltage and current can be adjusted to give the desired outputs more accurately.I was very pleased with its performance.

Works as described, but if you need more voltage get one with more voltage output.

I bought this unit as an upgrade from a cheaper 4amp unit that did not work as I had hoped. So far, this unit is everything I had hoped it would be, and more.-----------------Pros:On-off button controls the output, not the display. This is absolutely a plus, because it means that one can adjust the desired voltage and current settings before turning on power to the output. (One can also adjust settings while the output it on, but this switch adds flexibility.)Bright, color display shows a wealth of information in a single screen.Built-in fan to keep components cool.Easy to mount the unit - just cut (or 3d print) a rectangular opening of approximately 75 x 39mm and pop it in---------------Cons:The interface is a bit complicated / tedious, though it gets easier to navigate with practice. Other than the on/off button mentioned above, all input is handled through a single rotary/push-button knob.The included manual (and the one available on-line) does not entirely match the unit, especially for the last "preferences" screen - the unit I received seems to have more options than what the manual shows, and I have not figured out what some of them are.This unit is bulkier than the 4-amp unit I started with; with the latter, I was able to build my DIY bench power supply entirely within the case of a surplus PC power supply. To accommodate this unit, I had to create a 3d printed "extension" to the case to allow more room.-----------------The pros far outweigh the cons, at least for my purposes. I have not had the unit long enough to know if it will remain reliable over time, but so far it has given me exactly what I had hoped for in a cheap DIY bench power supply.

Great little adjustable power supply. Only reason I gave it 4 stars is because of the heat. The fan on this little thing can’t keep it cool enough to run at 5 amps at 24v. I used hot glue and added a bigger fan. This is the second one I have gotten because I love these little thing! Great for fans or lights or troubleshooting stuff.