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Thread: Neo Geo CMVS RGB with THS7374

  1. #1
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    Neo Geo CMVS RGB with THS7374

    I'm using this RGB PCB with impedance matching signals by noob in my CMVS:
    https://oshpark.com/shared_projects/R8NJ9UQ4

    The colors are good but the picture is too dim if compared to the image i got with just using resistors in the RGB lines.
    I'm using a Scart to YUV converter in a Sony CRT together with a MV1C. Same Scart cable as a Mega Drive model 1 minus the capacitors.

    There's this other version of the pcb by Philenotfound:
    https://oshpark.com/shared_projects/jzNmi8o1

    Have anyone here used this pcb with good results?
    I was wondering if i use the Philenotfound's version instead of the pcb made by Noob i would get a different result.

  2. #2
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    segasonicfan's Avatar
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    Quote Originally Posted by Misos View Post
    I'm using this RGB PCB with impedance matching signals by noob in my CMVS:
    https://oshpark.com/shared_projects/R8NJ9UQ4

    The colors are good but the picture is too dim if compared to the image i got with just using resistors in the RGB lines.
    I'm using a Scart to YUV converter in a Sony CRT together with a MV1C. Same Scart cable as a Mega Drive model 1 minus the capacitors.

    There's this other version of the pcb by Philenotfound:
    https://oshpark.com/shared_projects/jzNmi8o1

    Have anyone here used this pcb with good results?
    I was wondering if i use the Philenotfound's version instead of the pcb made by Noob i would get a different result.
    The description for the first board explains that if you're not using scart you need to add capacitors for the RGB lines. The brightness won't be correct if your adapter cable doesn't have those capacitors. You should also see about the possibility of hooking it up directly to an RGB monitor so you can rule out your YUV converter as the issue.

    If for some reason the capacitors don't work, that you simply need to adjust the voltage divider for more gain.
    Last edited by segasonicfan; 05-28-2019 at 04:49 PM.
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  3. #3
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    I don't think the problem is with my converter, as i use it with other consoles and it works fine with good brightness. If i use a cable with capacitors the image will get even darker. I think i need to adjust the voltage as you said, jus need to know how.

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