Review on 🔌 PEMENOL 15W DC-DC Adjustable USB Power Supply Module - Convert Voltage from 5V to 3.3V, 9V, 12V, 24V, 30V - Step Up/Down Module with CVCC Buck Boost and Shell by Amrozi Papi

This review is for a red box, 4-13V input, 1-30V output as shown in the photos which should accompany this review. I bought this block to be part of my electronics toolbox as it looked like a very handy little block. After using it for a few days, I'm really amazed at what this little power supply can do! The device arrived on time and well packaged. There were no instructions in the box, but the seller provided a PDF download link in the product description. To be honest the device is so well designed and clearly labeled that I didn't really need them other than to understand how the TRIG button works. I really like the design of this device. The inputs speak for themselves - there's a standard USB-A input connector, a USB Type-C input, a micro-USB input, and two solder points for you to connect cables to. The output is via USB socket A or spring terminals. I love that the developers added these two solder points as you can adapt this power supply to many different input jacks. For example, I could add wires and a Deans RC car connector and power the unit with two series of Li-Po batteries commonly used in RC cars. It's awesome. The spring clips on the output worked well and securely held the wires which I inserted to test the device's output performance. Again, the spring terminals make it easy to adapt the device to whatever you want to power. The display is sharp and backlit, and I found it very easy to read from different angles. The constant current (CC), constant voltage (CV), and FC LEDs were nice and bright, but not overly bright. The CC and CV adjustment knobs are small, but still easy to adjust. I ran *a lot* of tests with this little consumable and it worked great. In fact, one of the pictures shows my test setup - two purple wires go to my lab power supply, one set of red/black test wires goes to my lab voltmeter, another set of red/black/white test wires goes to my electronics load/ammeter. (In the other two pictures I didn't connect the test leads, just left the purple wires in place). The device met the 15W output power specification...even when the output voltage is very different from the input voltage! For example...when I applied 5 VDC to the input and the device output to 13.8 VDC, it produced 15.2 W of power! In another test...when I applied an input voltage of 4.5 VDC and the device output to 5 VDC, it supplied slightly over 2 amps. It's pretty amazing! The output voltage regulation was also very good, with a maximum of 0.1 VDC at maximum output current, which is great for the price. Output noise consistent with other switching power supplies I've measured. And these other consumables often cost a lot more than this device! I have verified that the over-current protection (OPP) works as advertised and shuts off the output if you exceed the maximum output power of the device. The Over Temperature Protection (OTP) works well too, turning off the device if it gets too hot. This is a very nice design that prevents the PSU from being operated beyond its maximum specifications. All in all, this power supply does everything and is an extremely practical addition to my electronics toolbox! With a single power supply I can accept a wide range of input voltages - 4 to 13 VDC - and provide a very wide range of output voltages - 1 to 30 VDC. Just great. Especially for less than $20!