Neovibe power question

[blues_mang]

I'm just finishing up my Neovibe build and I have a question regarding the power. This is probably a stupid question, but I figured it was better to ask than assume. Anyway, I have a Dunlop 18VDC center negative power adapter that I'm going to use with the Neovibe. I'm using the GGG board, and I'm using this power jack from SmallBear: http://www.smallbearelec.com/Detail.bok?no=666. If I've got this correct, I just run a wire from the positive of the power jack to pad marked J on the PCB only, correct? And that's the only power wire that is run. I'm using a plastic jack, so I've got that covered. And no ground wires get run from the adapter to board. Have I got this right, or am I way off? I appreciate the help.

[axg20202]

From memory, if you have the rectifier installed on the board, you can feed it AC or DC. I don't think it matters which way round you make the two connections (postive verses ground), but you do need to make both connections from your power source. The rectifier will make sense of it I think.

Andy.

[axg20202]

....However, i think it is important that the power ground connection (made to either J or K) is not grounded to the chassis etc, it must go just to your power source.

[blues_mang]

Ok, so I have the rectifier installed. Does it matter which pad, J or K, that the wire from the power adapter connects to the board? It looks like K goes to the positive side of the rectifier and J to the negative. And what is pad O used for? It looks like it runs to ground, but the instructions say not to ground either wire.

[axg20202]

Like I said, you connect the wires from your power inlet to J and K and it makes no difference which way round you connect them because the rectifier sorts out the polarity just as it would if it was AC being supplied. Just make sure that the power socket is isolated from the chassis.

[mdh]

What axg20202 said, plus, pad O is just the ground point of the pcb.  You still need to *have* a ground, it's just that the way R.G. set up this board, the external power supply can't be referenced to that ground.  So pad O is connected to the input and output jack grounds, and it's where you'll want to take the ground connection for any indicator LED you might have from that point as well.  You just need to abstract the external power supply away in your mind as a two-terminal source of voltage applied to pads J and K, irrespective of polarity, and with *neither* of those two terminals connected to ground.