My unit does not seem to be powering up
I purchased by unit through Amazon, the title of it being "seeed studio KiwiSDR Kit Software Defined Radio with BeagleBone Green". Since it did not come with a power supply, I did a search on Amazon for one using the search for "Voltage: +5V DC, 2.1mm jack, center pin positive", I selected what came up, but apparently what I got was a 9v one. I did not notice this until I had plugged it in. Thinking the power supply was not working, I checked to see if it was supplying any voltage. It was, but at 9v, not 5v. I'm hoping that I have not damaged the unit and that getting a power supply that supplies the correct voltage will allow it to power up. BTW, does anyone know if Amazon sells a 5v power supply?
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https://www.amazon.com/5V-4A-Power-Supply-US/dp/B0749668H2/ref=asc_df_B0749668H2/?tag=hyprod-20&linkCode=df0&hvadid=312111529833&hvpos=&hvnetw=g&hvrand=7560649527123397018&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9051644&hvtargid=pla-569349343814&psc=1&tag=&ref=&adgrpid=67656252888&hvpone=&hvptwo=&hvadid=312111529833&hvpos=&hvnetw=g&hvrand=7560649527123397018&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9051644&hvtargid=pla-569349343814
Even though you plug power into the Kiwi board it is first routed to the Beagle and its power management chip (PMIC) for monitoring, protection and switching. From there it goes on to power the Beagle and then back over to the Kiwi board. The PMIC has an absolute maximum input voltage spec of +20 VDC. It won't power-on at that voltage (5.8V is the limit) but it's supposed to withstand it. So that's why you got away with applying 9V.
However we have had a couple Kiwi/Beagles expire when reverse input voltage was applied.