Buck Boost Converter, DC 5.0-30V to 0.6-30V 4A 35W Adjustable Voltage Regulator LCD Display 6V 9V 12V 24V Power Supply Module, CC CV Step Up Step Down Voltage Stabilizer for Car RV Golf Cart

Really useful item when you need it. No complaints. It takes a few minutes to understand the controls, but that's really all. It might have helped if I looked at the instructions. If you're looking at this converter, you already know what it does. Updated Review a year later: Buy it. I needed to know the kick-on voltage for a board/display and this proved more valuable than my desktop adjustable power supply. This has more fine-tooth control that's responsive, and doesn't necessarily have to kick in until you press the button. It's jumped 12v to 23-24 and dropped 12v to 3.3 (and lower) without issue. Easily a worthwhile purchase.

Does the job, but overly complex user interface for my application. Also, it really does not come with a case. The photos show components protruding out the back but still I was surprised there was no cover.

It works, and can be set up for basic operation easily. It comes with a full-color instruction sheet. That said, the instructions are not easy to understand and the number of functions is mind-boggling. Just understanding what those functions are is challenging. But DROK did have the decency to set the startup defaults for the most likely use -- providing adjustable voltage at unrestricted amps. Keep the instruction sheet. Maybe even give it a once-over. But hope you never have to use it. I predict frustration.

I bought this item about 18 months ago and it worked great. After almost constant use as a DIY lab power supply, some of the segments in the LCD display quit working. Although you need at least five hands to disassemble the unit, I finally got it apart, removed the LCD display and cleaned the zebra connector and PCB connector with 99% IPA. I reassembled the unit, and it works flawlessly. Looking closely at the PCB design and overall assembly, this is a high quality product. If it ever dies, I will get another one from the same supplier.

Well, I just got this bad boy set up after pulling it out of the package and I can already tell the LCD screen won’t last very long. At first it displayed “Li.i0 CV and 0. backwards seven i0 A” and I couldn’t tell you what the last portion was. After about 20 minutes or so the LCD started to display a little bit clearer, but my confidence level in the screens lifespan isn’t great. I will say, it does appear to be functioning the way that it should (of course other than the display). I’m not saying this will be the experience for everybody, but the picture included shows the best it’s displayed so far. But it’s definitely a hit and miss on the quality when powering on. Edit: for some reason, my review won’t go through either. Either way I’ll be requesting a refund the following day the screen is getting worse.

Got two of these to power my QRP rigs. The QMX+ wants 12v (not 13.8v). This unit allows me to set the voltage easily (which also sets power on many QRP rigs). The overcurrent protection is easily set to protect the radio. Printed a nice case for it. May use it for anodizing and plating.

Works great, but if you lose the user guide (one sheet of paper), it's a steep learning curve trying to figure out making adjustments. Looked at the store's webpage on amazon website, but no luck.

The Drok 200659 buck-boost converter is a bargain at US$24, is easy to deploy, has numerous features, and easy to read and adjust. It was also able to supply more power than I expected. It's rated at 6A, 120W maximum - but I found that 6A rating applies to the output, but does not limit the input. In the image, the output is ~4.7A at 24V, meaning it was drawing about 10A from a 12 V battery! Some nice extra features: * There are 10 voltage/current presets, making it easy to return to a commonly-used setting. * The display shows voltage (switchable between source and output), current, and a choice of watts, watt-hours, ampere-hours, elapsed time, and temperature, either on-board or with a supplemental thermistor. * Read-out was reasonably accurate as delivered (much better than 1% difference from my DVM), but it can be calibrated it to even greater accuracy. * It offers a serial interface for programmatic control. My only small kvetch: it comes with a four-page manual, but I've not yet found a PDF of it online. Also, there is some AC ripple in the output. At 30 mA, I measured 3 mVAC, and it is rated for 150 mV at full current. For noise sensitive circuits, add L-C filtering. Kudos to Drok!

I don't think its intended for this but it works fine

Initial impressions after a few quick tests followed by 2 hours of running under load: Item turned out to be far more programmable than I expected - a nice surprise. I found the provided instructions to be perfectly acceptable - clear, not confusing or difficult to understand. I bought this item after finally realizing that the problems with my Peltier module projects were largely because the modules require a current-limiting power supply. I'm not sure this unit is robust enough to run continuously at it's max V and A ratings, but I'm currently using it to boost 12V from a small ATX power supply to 24V and it's delivering 2.6A into two 12706 Peltier modules (connected in series). I set it to 3A but it says it's delivering 2.6A - I'm not sure why only 2.6, but I'm achieving the temperature regulation that I was after from the Peltier modules (for the first time in 4 years of tinkering with this "invention") so I'm happy. At this load, this regulator seems to be running at a steady 49 degrees C, mounted in a recycled computer chassis with moderate air flow. I've just ordered a second one

These are probably the best of this type and work very well. Configurable and no glitches seen (Go for the one with the fan )