Main > Main Forum
1, 2, A, B Grounds for J-Pac
kenzo42:
why does the j-pac use these 4 grounds if there is no power 5v, 12v, -5v going to it?
on the ultimarc website, it says that these connections are used by the j-pac??? will the j-pac still work w/ out these 4 grounds?
SirPeale:
It's just ground; there's really no reason you'd want to cut it off. It's getting ground from the PC.
kenzo42:
Hey Peale,
I understand that the pc has it's own ground. However, I notice that the 8 grounds traces (from pictures I've seen) are still intact, thus being used. The locations for these 8 grounds are 1, 2, A, B, 27, 28, e, f. Can you tell me what these traces lead to?
I need to split one of those grounds or find one that's not used (for a needed total of 9 grounds, jpac uses 8) to ground a 5v line. I will be powering something from this 5v line.
Thanks.
SirPeale:
The grounds are all connected. Get +5v from the power supply.
kenzo42:
I would, but I need to load +5v from my cabinet's psu, not from the PC psu. My cab's PSU goes into overload mode w/ out a board (ALL my wiring is jacked through the PSU, so I can't remove it). So I'm going to just load my PSU w/ a dummy jamma board, thus the 5v.
I just read this on Bob Robert's site, which is essentially the same thing you said:
<<The PCBs ground traces are all linked together on both sides of the board, so any place that is designated as ground on the PCB, is just that, logic ground, and unites all logic ground into one common termination back to the supply grounding point at your source of DC power.>>
So I'm assuming by splitting a ground, there won't be any problems since they are all linked together.
Navigation
[0] Message Index
[#] Next page
Go to full version