Note the first comment.
There's an error on the schematic -- pin #3 on the first NE5532 does not connect to the junction of the 47 k and the 100 Ω -- it only connects to the two 47 k resistors.
alt Hacker News
There's an error on the schematic -- pin #3 on the first NE5532 does not connect to the junction of the 47 k and the 100 Ω -- it only connects to the two 47 k resistors.