I'm a noob so please have patience with me. I have a 12V power supply to charge a motor driver, that I also want to power my Raspberry Pi-4B. I bought these mini buck converters on Amazon:
I adjusted the power supply to 12V and connected the +/- to the converter's IN. I then adjusted the out voltage of the converter down to 5.09v (closest I could get with the POT). Then I connected the converter's OUT to the Pi, + to pin 2 (5v) and - pin 6 (gnd).
When I turned on the power, the Pi started smoking and of course didn't power on. The converter has a max 3A, which is what I need for the Pi, right? So why would this setup fry my Pi?
Prior to running this test, I adjusted my power supply to 5.2V and hooked it up to those same pins, and when I powered it up it worked beautifully.
Anybody have an idea on what I'm doing wrong? This is my first time using these buck converters.