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 Post subject: Neo Geo MV-1C video output voltage?
PostPosted: Tue Sep 08, 2020 10:54 pm 


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Joined: 15 Jul 2009
Posts: 275
Location: Canada
I recently got a really cool consolized kit for Neo Geo MV1C boards that uses SNES controllers:

Image
https://www.tindie.com/products/chipnet ... herboards/

It works great, but the video seems hot. Is this similar to how dreamcast VGA seems to be overdriven?

Does anyone know the standard output voltage of a MV1C, and what it needs to be tamped down by to get it within spec? Thanks!


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 Post subject: Re: Neo Geo MV-1C video output voltage?
PostPosted: Wed Sep 09, 2020 3:21 pm 



Joined: 05 Nov 2019
Posts: 17
HDgaming42 wrote:
I recently got a really cool consolized kit for Neo Geo MV1C boards that uses SNES controllers:

Image
https://www.tindie.com/products/chipnet ... herboards/

It works great, but the video seems hot. Is this similar to how dreamcast VGA seems to be overdriven?

Does anyone know the standard output voltage of a MV1C, and what it needs to be tamped down by to get it within spec? Thanks!


dreamcast isn't "that" overdriven. The real problem with dreamcast is the voltages not linear 0-100IRE.


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 Post subject: Re: Neo Geo MV-1C video output voltage?
PostPosted: Wed Sep 09, 2020 4:35 pm 



Joined: 13 Apr 2013
Posts: 261
To get the best possible video output you need our VGA16 scan-doubler or RGB16 video amplifier board. They are all optimized for the Neo Geo with impedance matching outputs.

https://www.beharbros.com/rgb16
https://www.beharbros.com/vga16-mvs


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 Post subject: Re: Neo Geo MV-1C video output voltage?
PostPosted: Wed Sep 09, 2020 7:27 pm 


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Joined: 16 Jan 2014
Posts: 1041
HDgaming42 wrote:
I recently got a really cool consolized kit for Neo Geo MV1C boards that uses SNES controllers:

Image
https://www.tindie.com/products/chipnet ... herboards/

It works great, but the video seems hot. Is this similar to how dreamcast VGA seems to be overdriven?

Does anyone know the standard output voltage of a MV1C, and what it needs to be tamped down by to get it within spec? Thanks!



What do you mean the output seems hot? Whats the peak to peak voltage on a full white screen?


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 Post subject: Re: Neo Geo MV-1C video output voltage?
PostPosted: Wed Sep 09, 2020 7:57 pm 



Joined: 13 Apr 2013
Posts: 261
It has only 220uf caps on the RGB lines.


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 Post subject: Re: Neo Geo MV-1C video output voltage?
PostPosted: Fri Sep 11, 2020 10:15 pm 


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Joined: 15 Jul 2009
Posts: 275
Location: Canada
Josh128 wrote:
What do you mean the output seems hot? Whats the peak to peak voltage on a full white screen?


Is there a way I could determine this without dropping $400 on an oscilloscope? (the picture isn't of mine).


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 Post subject: Re: Neo Geo MV-1C video output voltage?
PostPosted: Fri Sep 11, 2020 10:26 pm 


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Joined: 15 Jul 2009
Posts: 275
Location: Canada
beharius wrote:
To get the best possible video output you need our VGA16 scan-doubler or RGB16 video amplifier board. They are all optimized for the Neo Geo with impedance matching outputs.

https://www.beharbros.com/rgb16
https://www.beharbros.com/vga16-mvs


The RGB16 looks very interesting. Can't wait until it's out and has some reviews!


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 Post subject: Re: Neo Geo MV-1C video output voltage?
PostPosted: Sun Sep 13, 2020 9:21 pm 



Joined: 11 Jun 2014
Posts: 22
I have 2 MV1Cs and measured the RGB output into 10K ohm loads. I got R/G/B peaks of 3.46/3.48/3.48V on one unit and 3.46/3.47/3.47V on the other. To get 0.7V a voltage divider of 7.87K/2K should do the trick.

Spoiler: show
R
Image

G
Image

B
Image


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 Post subject: Re: Neo Geo MV-1C video output voltage?
PostPosted: Mon Sep 14, 2020 1:00 am 


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Joined: 16 Jan 2014
Posts: 1041
Nice, thanks for the info. I believe that most if not all JAMMA arcade boards use this TTL level RGB output.


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 Post subject: Re: Neo Geo MV-1C video output voltage?
PostPosted: Mon Sep 14, 2020 1:00 am 


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Joined: 16 Jan 2014
Posts: 1041
Nice, thanks for the info. I believe that most if not all JAMMA arcade boards use this TTL level RGB output.


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 Post subject: Re: Neo Geo MV-1C video output voltage?
PostPosted: Wed Sep 16, 2020 2:24 am 


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Joined: 15 Jul 2009
Posts: 275
Location: Canada
L-Train wrote:
I have 2 MV1Cs and measured the RGB output into 10K ohm loads. I got R/G/B peaks of 3.46/3.48/3.48V on one unit and 3.46/3.47/3.47V on the other. To get 0.7V a voltage divider of 7.87K/2K should do the trick.

Spoiler: show
R
Image

G
Image

B
Image


Thanks so much for taking the time to test this and post the results! Saves me buying an oscilloscope!


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