Hey dudes,
I acidentally killed one of those Ebay component tester things based on the Atmega328 microcontroller.
I stupidly tried to test a 100 µF 400V capacitor from a SMPS without discharging it first. I connected probe 1 and 2 to the cap terminals, and when I put the 2 on there, there was a pretty big spark. After that, tester completely dead.
I've looked inside and there's a 3V3 voltage regulator in there that might be shorted (it shows 3.4 mV [in circuit] between Ground/Adjust and Vin, which I don't know is normal or not).
Any ideas on what might have been smoked? Is the tester done for?
Here's a schematic that kinda shows how it's designed. It's not quite the same as mine, though, as there's no 3V3 regulator in there. It might only be used for the display, I'm not sure.
Thanks, dudes.