Review on 🔌 eBoot Mini MP1584EN DC-DC Buck Converter Power Supply Module - Adjustable 24V to 12V 9V 5V 3V (Pack of 6) by Jimmy Montalvo

I needed 3 DC/DC, one didn't work (no output voltage), three work and the other two are still in the sealed bag. The design is good just in case I improved the soldering of the chip, but that's probably not necessary. VIN must be at least 3V above VOUT for proper operation. It works very well for me and gives a pure DC output, but I haven't tested it with full output current. The potentiometer is counterintuitive (clockwise -> lower output voltage) but it works. The design is such that if the potentiometer does not have a good tap connection, the output voltage will spike, which is not good. I removed the potentiometer and put 603 surface mount resistors in its place (one for each DC/DC) that give the desired voltages (12V and 5V). If you remove the potentiometer, its pads match the 603 SMD resistor very well.