MVS MV-1C Stereo Mod - working now.

Reclaimer

Reclaimer

Haomaru's Blade Shiner
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Attempting to add stereo RCA jacks to my MV-1C.

I soldered wires to the L/R taps as listed here, but haven't cut any traces or removed anything:
http://www.jamma-nation-x.com/jammax/images/Stereo_on_MV-1C-1.png

When plugging these L/R wires into an amplifier, it's VERY low volume and staticy.

What am I missing? I should have to ground this somewhere, right?

Any help is appreciated. :)
 
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aha2940

aha2940

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AFAIK, that mod gives line level output, suitable for amplifiers. For ground use the regular ground provided by the MV-1C, which should go to the sleeve of the plug:

TRS-Audio-Plug-Connections-2.png
 
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Thanks, I didn't notice anyone mentioning ground in stereo mod tutorials, which confused me.

Where should I pull the ground from so I don't introduce more noise?
 
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Haomaru's Blade Shiner
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Just pulled the ground from the large ground pad right near the audio solder points.

Working pretty well now! (If still a bit noisy, but it's actually likely cleaner than the stereo from my 2 slot)
 
aha2940

aha2940

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Reclaimer said:
Thanks, I didn't notice anyone mentioning ground in stereo mod tutorials, which confused me.

Where should I pull the ground from so I don't introduce more noise?
Click to expand...

You're welcome. I usually try to get ground from the JAMMA edge, however like Xian Xi said once (quoted from MKL IIRC): ground's ground. There are no better grounds that others, so it may be convenient to look for ground on a nearby chip (most, if not all of them have at least one leg connected to ground) and pull it from there. From this pic: http://benheck.com/Downloads/Stereo_on_MV-1C.jpg (which is actually a higher resolution of the one you posted before) it seems leg 3 of that 9480F chip (the leg next to the white R wire) is connected to the ground plane, so that should work. Might want to check with the voltmeter, of course.

Regards.
 
Xian Xi

Xian Xi

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For the Stereo mod, you don't need to cut any traces, that's old info. I'm not sure if I removed that bit or not.

And yes, ground is ground. You can pull it from any ground point, just keep in mind that you need a matching gauge or lower for the ground. If you are using 24awg wires, then ground needs to be the same or lower. I usually go 22awg if using 24awg for signals.
 
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Haomaru's Blade Shiner
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Thanks man! Used a matching gauge all around. Stereo is niiiiice, every MVS should be using it.
 
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Haomaru's Blade Shiner
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I just remembered that I actually daisy chained the ground - Board to LeftRCA to RightRCA. (Similar to chaining the ground on the buttons in a panel)

I used thick (20 or 22?) gauge wire, and haven't noticed any issues.
 
Q

quru

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OT, but with this stereo mod in place it seems you need an amplifier of some sort. Do you guys have any examples of suitable amplifiers for use in a consolized MVS?
 
Heinz

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No good for headphones but fine for a TV or an amplifier. The guide on JNX is great to have, I've got a 1C heading my way soon and I was wondering how the hell I'm going to get stereo from it.
 
Neo Alec

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If I ever try it again, I need to be careful. I already wrecked an MV-1C trying to add an amp.
 
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Haomaru's Blade Shiner
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Why wouldn't you just add an amp after the line out? No way to ruin the board that way.
 
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