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PostPosted: Tue Sep 07, 2010 4:11 pm 
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OK, so I like to do things the easy way. Sometimes they work, other times, not so much. So I wanted to Consolize an MVS, but in contrast to everyone else on the world, I used an MV-1C with the vertical mount so I could custom make a case and have it vaguely resemble an AES, but with a GOLD MVS logo on it.

Right so initially, I started using Ben's sheet but quickly abandoned it in favor of this>

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=250682942004&ssPageName=STRK:MEWNX:IT

A swanky adapter with all the plugs you need so you can connect it to a tv, power, and everything.

Then I used one of these.

http://cgi.ebay.com/RGB-Scart-Male-3-RCA-AV-Female-Adapter-Converter-/130389078197?pt=LH_DefaultDomain_0&hash=item1e5bcb70b5

to connect the SCART out to the TV using an S Video cable.

I have different MVS boards and a JAMMA board that I want to try before I screw around and build a case.

Now all of this seems like great planning and the connectivity is working out, only one problem with my master plan: I get nothing but black on my TV. (Its a 42" LCD HDMI) I cleaned the boards and used a small ATX power supply. The TV has an S vid channel and its receiving something for it to go to black screen.

Anyone got any advice? Did I miss something?

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PostPosted: Tue Sep 07, 2010 8:09 pm 
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Is it outputting PAL instead of NTSC? SCART is really common in the UK; that's why I ask.

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PostPosted: Wed Sep 08, 2010 11:12 am 
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I thought about that. But I was sure that Svideo was universal...

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PostPosted: Fri Sep 24, 2010 10:46 am 
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After some investigating, Svideo isnt universal and I need an encoder. Luckily I found someone who sells AD725's for $9 shipped. Anyone got a good schematic for me? I just need to wire the Component/Svideo pal to the AD725 and output to NTSC Component/Svideo.

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PostPosted: Fri Sep 24, 2010 12:44 pm 
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I found a datasheet:
http://www.analog.com/static/imported-f ... /AD725.pdf
page 12. VGA to NTSC or PAL.
Not a perfect match, but it is a start.
Page 17 suggests that with CSYNC the input should go into pin 16 (HSYNC) and pin 17 (VSYNC) should be high unless the signal is inverted.

http://www.neo-geo.com/wiki/index.php?t ... eo_Encoder
That the 0.01 µF cap on sync trick didn't work?


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PostPosted: Sun Oct 24, 2010 3:13 pm 
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DO you know what oscillator is used? I went out an got an AD725 and I think I'll have to build a PCB.

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PostPosted: Thu Oct 28, 2010 6:48 pm 
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The datasheet specifies a 4 FSC TTL (NSTC) 14.31818 MHz OSC, however it also states in its text that a FSC can be poached from the video source.

I would try to get away with using a free runnning oscillator instead of buying or designing a full blown Horizontal Genlock, 4FSC first- though the ElectronicsPoint forums suggest extracting the circuit out of an old playstation instead of building a PCB with this one from scratch.

Sorry I cannot be more helpful but I am very distracted at this time..

electronicspoint.comElectronics Forums > RGB to S-video/composite using AD-725

neo-geo.comNeo-Geo Forums > RGB NTSC/PAL encoder

digikey.com535-9170-5-ND $2.44


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PostPosted: Sat Jan 29, 2011 7:22 pm 
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I tried building a RGB to composite/s-video converter using the AD725, using the schematic on this page:

http://www.engadget.com/2006/11/28/how- ... cade-game/

But, it produced a very poor quality image that was almost unrecognizable. I didn't bother troubleshooting it, I just bought a converter. Pre-made converters are nearly the same cost as building the AD725 circuit.

RGB to composite/s-video $25
http://www.arcadespareparts.com/arcade_ ... 12217.html

RGB to VGA $35
http://www.arcadespareparts.com/arcade_ ... 13052.html

If you have a TV with a VGA input, the VGA converter has better compatibility and picture quality, so I would go with that.

Also, I made a wiring diagram of my SuperGun system.
Only the component side of the JAMMA connector is shown, the solder side is nearly identical (minus the video and sound.)
The DB15 connector is fully compatible with NeoGeo controllers, or build your own controller so it has 6 buttons for fighting games ( plus a start button.) I used 2 unused pins on the DB15 connector for wiring the 6 and 7 buttons. Most JAMMA boards only support 3 buttons on the connector, if more buttons are needed they are connected using the appropriate kick harness.
The DB9 connector is for connecting a kick harness to use buttons 5-7 and/or stereo sound. This way, you can easily swap out games without tedious wiring of the kick harness.

Aside from soldering lots of wires, building your own supergun is surprisingly simple.


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PostPosted: Sun Jan 30, 2011 10:59 am 
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on electronicspoint.com a7yvm109gf5d1@netzero.com
Guest wrote:
http://en.wikipedia.org/wiki/Image:CGA_CompVsRGB_Text.png
Does it look like the picture on the right?

(out of curiousity)


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PostPosted: Wed Nov 30, 2011 5:16 pm 
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does anybody have a picture of the engadget one hooked up? i saw that on the link it tells you how to make the RGB to NTSC adapter, but does anybody have pictures of it hooked up?

thank you

low_budget wrote:
I tried building a RGB to composite/s-video converter using the AD725, using the schematic on this page:

http://www.engadget.com/2006/11/28/how- ... cade-game/

But, it produced a very poor quality image that was almost unrecognizable. I didn't bother troubleshooting it, I just bought a converter. Pre-made converters are nearly the same cost as building the AD725 circuit.

RGB to composite/s-video $25
http://www.arcadespareparts.com/arcade_ ... 12217.html

RGB to VGA $35
http://www.arcadespareparts.com/arcade_ ... 13052.html

If you have a TV with a VGA input, the VGA converter has better compatibility and picture quality, so I would go with that.

Also, I made a wiring diagram of my SuperGun system.
Only the component side of the JAMMA connector is shown, the solder side is nearly identical (minus the video and sound.)
The DB15 connector is fully compatible with NeoGeo controllers, or build your own controller so it has 6 buttons for fighting games ( plus a start button.) I used 2 unused pins on the DB15 connector for wiring the 6 and 7 buttons. Most JAMMA boards only support 3 buttons on the connector, if more buttons are needed they are connected using the appropriate kick harness.
The DB9 connector is for connecting a kick harness to use buttons 5-7 and/or stereo sound. This way, you can easily swap out games without tedious wiring of the kick harness.

Aside from soldering lots of wires, building your own supergun is surprisingly simple.


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PostPosted: Sat Dec 24, 2011 6:17 am 
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I've partially abandoned the project to focus on other things. I still have everything though in case I get the itch to revisit it. I was watching a video PAL to NTSC converter on ebay that was like $40. It's just funny that at the heart of my project is a bunch of converters going into other converters. I even got a casing and everything for it; swapped out the MVS board for one that was closer to my design; bought a supergun board...And I haven't touched it in over a year.

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PostPosted: Sun Apr 08, 2012 8:50 pm 
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Hi there,

Thank you so much for your 5 would dos and your 5 wouldnt dos

My wedding is two weeks away and I need all the advice I can get as I always feel I am missing things

Thank you,
Meezies


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