DROK 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

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.

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.

I didn't know how much I would use this until I got one! This thing is awesome for the test bench. I use it any time I need to test battery powered electronics for malfunctions due to current and voltage fluctuations. Easy to adjust the variables to pinpoint the exact fail point. Readout is straight forward and easy to read. Wiring is simple.

More testeng required

I am very happy with it. You can set it up in the CC mode where the voltage would drop when the current limit was maxed out - great for short circuit hunting or battery charging. The only critique I have is that it is a bit sluggish but so far it hasn’t been problem for me.

Great product, works wonderful

I want 2 b able to calibrate this thing and so far I haven't found a way. I mean it reads down to one hundreths of a volt but the unit I got isnt accurate to at a tenth volt. A matter of fact its about 2 tenths volt off, maybe even .25 volt off. I dont like that. Othe Drok units like this u can calibrate and rotate the display etc etc. Calibration is a fundamental necessity.