shows an obvious pin 1 problem in microphone DL1-1. Pin 1 is connected... | Download Scientific Diagram
Grounding and Shielding Audio Devices
The Pin 1 Problem Revisited - ProSoundWeb
In the steel structure shown, a 6-mm-diameter pin is used | StudySoup
The Pin 1 Problem in Audio, Star and Mesh Ground, and Contradictory Grouding Practices in Audio and Digital Systems - Electrical Engineering Stack Exchange