Ground loop: If you use more than one ground point in a multistage amplifier, the resistance between the ground points will produce small unwanted feedback voltages. This is a ground loop. It can cause unwanted oscillations in some amplifiers. Related posts: Personnel Management Operative Functions Administrative Role of PM Competency HR Management Role Change Personnel Policies Personnel Procedures Appealed Policies Implied Policies Specific Policies Personnel records Research Pure research Personnel research Attitude or Opinion Survey Turnover Secondary research Applied research Personnel audit Read more articles Previous Postgo/no-go test Next Posth parameters