DROK USB Buck Converter, 4pcs DC-DC Step Down Module 6-32V 12V 24V to 5V QC 3.0 Charging Module Power Supply Voltage Regulator Volt Transformer Board

I soldered this in yesterday to a solar panel whose original one burned out. So far it is working properly in good sunlight.

I’m into electronics and need a 5v supply to mod a Bose Wave Radio. The minus supply and output rails are common and is exactly what I needed for my project. I removed the usb connector and soldered the wires to the usb output in order to miniaturize the board. Works perfectly. I bought 4 as a set. Now, I have 2 left over.

Works for me. The USB connection is very useful when connecting to a Raspberry Pi.

Great converter. It lacks holes for mounting screws, so fixing it in a box can be tricky.

As described, fast delivery, worked as expected. Used for a hobby project. Would buy again.

Almost 1 & 1/2 years ago, I ordered a 10 pack of 3.2v, 50ah, Prismatic Lifepo4 cells from an online vendor. With 8 of those cells I built a 100 amp hour LiFEPO4 battery. But I had 2, 3.2v, 50ah cells remaining that I did not know what to do with.I started wondering if there was a USB module that would accept an input of a minimum of 6 volts to which I could connect the battery to charge and power USB devices. Then I discovered the DROK USB DC-DC Step Down Buck Converter capable of taking 6 volts minimum and converting it to a 5V QC 3.0 Charging Module. I read the reviews, good and bad...bad to see what people were complaining about, and decided to buy a set of 4.I figured that the converter module should work as a USB charging device when connected to the 2 remaining LiFEPO4 cells if the cells are wired in series to produce the required 6+ volts. (See the first picture of the 2 LiFEPO4 cells connected in series with one of the 2 connections coming from the converter module connected.)The second photo shows both wires connected, and the blue illuminated LED on the converter module. You can see "78% 10 m until full" on the screen of my phone. The third photo shows the charging symbol on the screen. It shows 79%. Sorry for the fuzziness of that picture.I used a few of the converter modules to charge my phone and tablet for quite a while over the last few days. I wanted to see how warm they would get. The converter module does get warm, but not too hot to handle...unlike another similar product that got far too hot to be safe. And that was only at about 1 amp of current output. I'll be submitting a brutally honest review on that one soon.I foresee finding an appropriate container in which I will cut holes for the 4 converter modules and the the 50 amp hour battery and use the power source for a portable mega-USB charging station. I'll upload pictures when I get around to making it.I am very happy that my idea panned out!

Word to the wise. Verify these devices produce their rated voltages before using them. I bought a pack of two to power Raspberry Pi 5s for an Amateur Radio project. I've bought a number of Drok products in the past with good results so I went ahead without testing; big mistake. I attached one of the Drok power supplies to a 12v battery and a Raspberry Pi 4 to the Drok; the Pi 4 instantly died in a cloud of black smoke. Subsequent testing revealed the defective Drok is passing 12 volts to the load vice the required 5 volts. Test of the second Drok power supply revealed it produces the advertised 5.3 volts and is currently powering a Raspberry Pi 5.

These buck converters work well and are very versatile.