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

The media could not be loaded. I used this in a customized portable power supply pack I built. I placed it on top of a battery adapter for a Dewalt battery (18 to 20 volts), and the adapter also has USB outputs too. This little power supply can supply voltages from an input voltage range DC 6.0-36V, with an output voltage range DC 0.6-36V, max output current 5A, max output power 80W. The unit allows you to set the volts and limit the current, power on off (NOT a master power on off, just the output voltage on off) and an accurate voltage setting return after power down. It has memory locations for presetting the voltages at those locations. So you can quickly pull up a voltage setting from memory. I used a switch on the side of my project to turn on and off the master power to the device, so I could still keep it on the battery without discharging the battery by having the display on.The black box was purchased from another source, though the contacts didn't work very well for the battery connections and thus I needed to adapt it to another adapter itself. All in all, a very handy device to use for testing various circuits by using a simple battery pack that can supply a multitude of voltages and set currents too. Input or output voltage, current, temperature, power, electric capacity, electric quantity, running time, voltage and current curve, system and power parameters. Very nifty.

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.

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.

This is one of the nicest voltage controllers I’ve seen. I only gave it four stars because it shuts off unless it has a continuous power source. We ran a 100 watt solar panel to the input and the output to two, twelve volt fans. The system worked like a charm until dark when the output of the PV panel tanked. The controller shut off and had to be restarted the next day. We plan to connect a small lithium battery to it which will provide continuous power. The PV panel will keep the battery charged, although as stupid as it sounds we will have to install a small voltage limiter in line with the battery. We are going to add another 100 watt PV panel and two more fans to the system next spring; this is to ventilate a small greenhouse here in Alaska.