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Do you have problems with GROUND?

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Stormrider:
Yes, the ground wire starts in the pcb in a ground point and then goes from switch to switch. When I reach the last switch, I didn't know I had to take that end and wire it back to the origin. I don't understand why. I'll try that now and see if it works.

Ginsu Victim:
You don't HAVE to wire it both ways. Here's this:

SavannahLion:

--- Quote from: Stormrider on March 20, 2008, 11:00:34 am ---Yes, the ground wire starts in the pcb in a ground point and then goes from switch to switch. When I reach the last switch, I didn't know I had to take that end and wire it back to the origin. I don't understand why. I'll try that now and see if it works.

--- End quote ---

The idea behind it is to alleviate or reduce the likelyhood of a particular kind of failure from occurring. Looping the ground wire creates two potential paths for the current to travel through. If a single break occurs at any point in the wire, the current will take the alternate path to ground. I can't imagine a break in ground being instantaneous, a more likely scenario is that a break in ground would cause intermittent behavior. Intermittent behavior is often the most difficult to diagnose. When a failure does occurs that disable buttons, it makes it easier to deduce where the break occurred and make the necessary repairs.

Here are some crappy pics I drew to give you a better idea on just how the buttons would fail under specific circumstances.

I think the assumption here is that your ground circuit isn't complete for some reason. In other words, there's a break in the line. When you make contact with the metal components of your cab, you're bringing the line potential down to ground which gives the appearance of the buttons working again.

SavannahLion:

--- Quote from: GinsuVictim on March 20, 2008, 11:07:07 am ---It doesn't. Here's this:


--- End quote ---

That is a very basic wiring diagram intended to get you up and running with a minimum of fuss. It doesn't encompass other valid wiring designs.

Ginsu Victim:
I understand the idea of running GND from both directions, I'm just showing that you don't HAVE to.
I'll be changing my setup to run GND both ways, though. I hadn't thought about it until now.

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