DROK Boost Buck Converter, DC 5.5-30V to 0.5-30V 5V 12V 24V Output Adjustable Power Supply Regulator Module, 4A 35W High Power Voltage Step Up Down Converter Board with Case LCD Display

Having read through a few reviews, I wondered what I was going to receive.Well, as noted elsewhere, there is nothing on assembling the parts, which is honestly not difficult.The only annoying part was removing the protective covering from the plastic. It was date stamped 2023, so the adhesive was maybe a bit more of a problem than it should have been. It was not easy to get a corner to let go, but once it did, it just peeled off with no problem.There are a few complaints about the tiny adjustment screws. Well, this really is not intended as a variable bench power supply, even though some people are apparently trying to use it as such. In a set it and forget it use, it works just fine. The other complaint was that the (output) voltage reading is incorrect -- well, within 0.1V it agreed with my Fluke meter. No problem at all.What I wanted it for was to use a lithium ion battery with a portable radio (Elecraft KX3). 12V Lithium ion batteries are constructed with either three or four cells. With four cells the voltage varies between 12 and 16V. 16V is too high. With 3 cells it varies between 9 and 12V. 9V is too low.So I set this at 14V and max of 4A (actual max is nearer 1.5) and tried varying the input from 9V to 16V.Output was perfectly stable at 14V with the radio operating perfectly as it switched form Buck to Boost.Honestly, I was surprised at how well it works.

From my experiences with the device, it works great! I can't seem to get it beyond 11.22 Amps (rated for 12) but I suppose that's reasonable. It is a bit annoying to dial-in the voltage and current values since they are very sensitive, but after all is said and done it "just works".

Nice unit it provides a wide voltage range of output. Easy to set up an use. Nice touch with the adjustment buttons and plexiglass shields. What could use improvement, would be nice to have paper instruction or a link to instructions, the voltage display, it is a bit off when measured by 2 calibrated DVM's but it is in the right range. The other area for improvement is the ripple/switching noise is high at 500mv pk-pk for my application at 1.5vdc. Depending on your application this may be acceptable. I didn't check if this is consistent through the output voltage range. I plan on putting some type of filtering on the output to bring it down. Other items, great size, lots of functionality for the price point.

I purchased one of these for a project recently. It worked so well that I purchased another one in order to expand my project.

From never let's me down. Their products always work well

Excellent. Exactly what I need to convert my 12v power supply to 8.5 volts

The “Drok” Boost Buck Converter (ZK-DP60) module that I received has problems in the displayed output current value.The voltage I applied to the input is 12V direct current. I set the output voltage to 9V and I did not limit the current with the corresponding setting.Under these setting conditions, and with no load connected to its output, it indicates a consumption of 0.013A (See foto). It should read 0.000mAWhen I connect a 56 ohms 2W 5% load in series with a multimeter, the actual current displayed by my instrument is 157.5mA while the displayed on the module is 0.172A.As time goes by and the module increases its temperature, the current displayed increases, reaching up to 193mA (See foto), but the actual current, measured by the multimeter, remains at 157.5mA.Of course, the indicated power consumption is also wrong.Continuing with testing and with the module having raised its operating temperature somewhat, I remove the load. Now the indicated consumption is 33mA (it should be 0.000mA since I removed the load).This value decreases as the module cools down until it reaches the 13mA with which I started the test.I also notice that when I twist the printed circuit board (PCB) the current value displayed on module changes enormously, depending on how I twist it in one direction or the other, this value increases or decreases. This happens with or without load on the output.I want to clarify that these are the only problems that the module has, since the output voltage remains stable with different load values and the setting of the maximum current limit works correctly like the other functions and settings that the module has.Unfortunately, I cannot ask you to replace this module because I live in Uruguay and I made the purchase through a courier that sent it to me from Miami to Uruguay. It is impossible for me to send you the module from Uruguay to your country.Please tell me what to do.

Get a 2S or 3S Li Ion battery to supply this with power, and you've got a very portable bench power supply that doesn't have to stay on the bench!