Elementary Grounding Questions

[bwanasonic]

Until recently I have grounded everything to the board ( jacks, battery/DC jack, switch, etc.). Now in the interest of saving pad space, and a more streamlined design, I have only one ground tab on the board, and ground off board parts to a jack.

 One question is: does it matter which jack I use to ground to ( In or Out )?
     
 Second question is: I still ground all pots to the board. Can I ground these to a jack as well with no adverse effects?

I have seen reference to "board ground" vs. "chassis ground", but I don't fully grasp that yet.

Thanks
Kerry M

[petemoore]

RG explained this very well...but the crux I believe is that all grounds should be made at one point on the board. If you run long wires you may be able to read voltage difference between one ground point and another.
 As long as you read ground at the sleeves of the jacks, which jack you make ground to doesn't matter.
 The idea is to make all the ground points reference to as close to the same potential of 0 volts as possible.