Little help with electrical hookups, please.

[Sasquatch!]

I need to get +5V to a Jrok RGB converter (http://www.jrok.com/hardware/RGB.html).  According to the Jrok website, I should be doing this:


Right now though, all wires from Pin 1 and 2 (on both the parts side and on the solder side) on my JAMMA harness are all going to GND on my power supply, and Pins 3 and 4 (on both the parts side and on the solder side) are all going to +5V on my power supply.

Should the wires from GND and +5V be going to from the powre supply to the JAMMA harness on the solder side only, and the wires from the JAMMA harness part side going out to feed my +5V on the video converter?  Likewise, if I were to need to feed +5V to my Optiac on my future cabinet, would I do this (tap off of the wiring on the JAMMA harness), or would/should/could I just grab a lead directly off of the power supply?

Or would it just be easier for me to get a +5V off of a PC power supply (for both the RGB encoder and the Optipac)??

SO CONFUSED.

[BobA]

Your JROK converter can be fed directly from your power supply. The points are your jamma connector are the same electrically as the 5V and GND on your PS because that is where they are usually connected.  If you have an optipac that needs 5V you can get it from the PS directly as well.  

Just feed everything from the most convenient point.  Do not however feed from different 5V supplies without some common ground reference.  I am assuming that you are feeding everything from the same power supply.

BobA

[Sasquatch!]

Your JROK converter can be fed directly from your power supply. The points are your jamma connector are the same electrically as the 5V and GND on your PS because that is where they are usually connected.  If you have an optipac that needs 5V you can get it from the PS directly as well.  

Just feed everything from the most convenient point.  Do not however feed from different 5V supplies without some common ground reference.  I am assuming that you are feeding everything from the same power supply.

Thanks for the reply, BobA.  Let me ask this, if I may:

All of my GND and +5V wires on the JAMMA harness at pins 1-4 are gonig to the power supply right now.  So they're just basically doing nothing?  ("Looping back", if you will?)

When you say not to use different 5V supplies, you mean don't use different 5V supplies with different grounds, right?  I'm still thinking about using a PC power supply for this, since it sounds easier.  Would this work?

[BobA]

I checked your site to determine what configuration you were using this jrok converter in but since you have quite a few projects listed I could not determine if you are using an arcade PS or PC PS and Jpac or Ipac etc.

To make it easy.. Use one PS (a PC one is a good choice).  Most newer arcade power supplies are simply small switching supplies very similar to a PC supply but with less output capability.  I was just trying to make sure that you were not connecting the jamma harness and the jrok to different supplies.

If you have more questions perhaps you could outline what is being powered and what interfaces are being used.

BobA

[Sasquatch!]

I checked your site to determine what configuration you were using this jrok converter in but since you have quite a few projects listed I could not determine if you are using an arcade PS or PC PS and Jpac or Ipac etc.

Ah, that's because it's for my next project, so no documentation as of yet!  

If you have more questions perhaps you could outline what is being powered and what interfaces are being used.

The next project will basically be a MAME cabinet, but I want to be able to play JAMMA boards in it too (I have a Neo-Geo MVS boardset already).  So I'll be powering a PC, TV, various 12V lamps, 5V for an Optipac, and 5V for the Jrok RGB encoder.

Right now, I want to be able to use the TV in the Neo-Geo cabinet, since the monitor is non-functioning in it.  So I guess for now - in that cab - I'll be powering the TV, the Neo-Geo PCB, 12V lamps by the coin door, and 5V for the Jrok RGB encoder.

To make it easy.. Use one PS (a PC one is a good choice).  Most newer arcade power supplies are simply small switching supplies very similar to a PC supply but with less output capability.  I was just trying to make sure that you were not connecting the jamma harness and the jrok to different supplies.

Why would that be bad if the JAMMA harness and the Jrok were on different power supplies?  I guess I'm still not getting why this would be bad.