The digital ground is typically pretty noisy. The high frequency digital signals cause quite a commotion on the digital ground. You typically want your analog ground to be as "flat" as possible and as "still" as possible. If it is directly tied to the digital ground, this can...
Wow. There has been a lot posted here; I don't have a great deal of comments to make on the ESD stuff that hasn't been mentioned here . . . Something I do want to mention about breadboarding . . .
When I first started in analog circuit design, when I was building my first prototype an older...