simple circuit reverse engineering

yes

Paul_KD7HB:
Did you try your ohmmeter?

Paul

Yes, and the black ones looks indeed resistors (marked 1002 and reading indeed 10Kohms) the gray parts all read as no conduction but one, which reads 22Kohms so I take that's a resistor, which would make sense as it is the one connected to the non inverting input of the op amp. still struggling with the A7p... 3 pins so at first look i thought it was a transistor, but only TWO pins of it are connected.