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Discussion in 'Burnt Fingers DIY Effects' started by peterg, Apr 11, 2013.
Does an output jack's ground tab need to be connected to anything?
Yes, it needs to be connected to (signal) ground.
Thought so. Some diagrams I've seen don't show it though.
In the drawing above, signal ground is connected to the sleeve of the input jack, and hence, the box. The output jack ground tab is also grounded to the box. The box is acting as circuit ground, and both jack sleeves are in contact with the box.
If the stompbox enclosure is made out of a conductive metal, that might be enough, if the enclosure is grounded, all depending on the design of the jack.
But in your illustration, it seems like it's the inner (hot) lead that is missing? That's strange.
I think peterg calls the ground lug for "inner" because it´s closest to the box and the hot lug for "outer" if I am not mistaken.The groundlug on the output jack is grounded in the metallic box.
So if it's a metal box i.e. Hammond 1590B then a wire from the output ground lug to somewhere else is not needed?
I can't take credit for the diagram. I picked it off a site. Just not sure which one.
Limbe - we are reading the drawing the same.
It's good practice to connect it by wire. That way it stays connected if the jack comes loose.
Yes, if it's a metal box, you can use the box as ground. But as tjk3052 said, it's good practice to run a ground wire anyway.
There are several reasons for that. Redundancy is one of them. Soldered connections having lower resistance is another (better toooone - may or may not be noticeable). A dedicated ground wire will also make the circuit easier to understand for the person who is to troubleshoot it 50 years in the future (one can always hope). And I'm sure there's a couple more reasons, but I can't think of any right now, and I've got work to do, so I shouldn't be reading TDPRI in the first place.
Using lock washers and tightening the nut will make it harder for the jack to come loose.
I use them most of the time.