I was trying to power a transimpedance amplifier built with an op amp on a protoboard.
I only had a power supply that looked like the first image below (no COM, which I would have connected to GND of the op amp).
The answers I got for my initial question posted on this website were really good and perfectly explained what I was supposed to do. (I initially asked questions about different kinds of power supplies)
I made a mistake of connecting the mains earth of the power supply (circled in the first image below) to the + pin of the op-amp, where GND (COM of a power supply) was supposed to go. I understand why I was not supposed to do it. The mains earth is ill-defined since it is disconnected from both positive and negative voltage outputs of the power supply.
It seems I broke my op amp when I connected the mains earth to + pin of the op amp where GND (so COM) was supposed to go. I see that I was not supposed to do it.
My question is how did I break the op amp by connecting the mains earth to the + pin of the op amp?