Good 'ol days (discuss.tchncs.de)

can we start posting overly recycled social media posts?
Other side:...
//Edit: It’s a SAS drive. thanks for the help :))...
I have a whole bunch of them. They are possibly a bit older (70s, 80s) judging by other contents of the junk box they are from....
First of all, I apologize for the lack of a “formal” schematic… I tried to draw one out, but got buried in the nuances of it :)...
Since I never understood op-amps from reading or practicing problems I wanted to build a circuit to probe around and use different resistor values to set the amplification....