External RGB to S-video schematic

[Drakon]

Well for that to happen someone would actually have to wire it up. And we all know that nobody around here ever does that.

[TrekkiesUnite118]

Well obviously we are waiting for you to wire it up since everyone here is completely incompetent and unable to compare to your amazing modding skills. Please tell us more of your amazing skills that involve covering boards in hot glue and hardwiring systems together!

[Drakon]

Well obviously we are waiting for you to wire it up since everyone here is completely incompetent and unable to compare to your amazing modding skills. Please tell us more of your amazing skills that involve covering boards in hot glue and hardwiring systems together!

Well it's better than accomplishing NOTHING. Except for copying and pasting information from forums and various websites, apparently that's all you need these days to be a "modder".

[TrekkiesUnite118]

Well it's better than accomplishing NOTHING. Except for copying and pasting information from forums and various websites, apparently that's all you need these days to be a "modder".

Yes I don't really want to listen to your advice because you're speaking from zero experience.

Where did I say I was a modder?

[Drakon]

Where did I say I was a modder?

You sure act like you're one, or atleast that you know what works and what doesn't.

Yes I don't really want to listen to your advice because you're speaking from zero experience. I get a lot of people giving me second hand information that they found on a website somewhere and if I tried everything they shoved in my face I'd never get anything done.

[TrekkiesUnite118]

I'm simply posting information I've read and heard about a certain issue with RGB. I'm not saying it will work or that I know what doesn't work. You however are posting what will and wont work based on something that's not related to the issue when you don't even 100% understand the issue that's being discussed.

[Drakon]

I'm simply posting information I've read and heard about a certain issue with RGB. I'm not saying it will work or that I know what doesn't work. You however are posting what will and wont work based on something that's not related to the issue when you don't even 100% understand the issue that's being discussed.

You act like I don't know what I'm talking about and you treat me like everything I post is unrelated. Between the two of us I somehow think I have a bit more "experience". It's annoying when I post something that is related but you automatically discredit it because s-video is somehow involved. You think I don't 100% understand the issue and you never consider that maybe you're not willing to listen just because I used s-video for part of an experiment. And I can see that no matter how much I try talking to you that opinion is never going to change.

[TrekkiesUnite118]

You act like I don't know what I'm talking about and you treat me like everything I post is unrelated. Between the two of us I somehow think I have a bit more "experience". It's annoying when I post something that is related but you automatically discredit it because s-video is somehow involved. You think I don't 100% understand the issue and you never consider that maybe you're not willing to listen just because I used s-video for part of an experiment. And I can see that no matter how much I try talking to you that opinion is never going to change.

And this is exactly how you act to people who you look down upon simply because they haven't soldered stuff to their systems. The issue with RGB is that if it's not the cable (Which I have not ruled out at all), all evidence points to it being the subcarrier signal causing interference. You instantly discredited this simply because it's not useful info for S-Video. You never once stopped to think "Well gee, maybe that would work for RGB since RGB never uses the subcarrier signal." You never once considered the idea that the two issues, while similar, are caused by different things since they are in fact different outputs that are generated differently.

[Drakon]

I did consider your theories I even wired up my component encoder to take a look. You act like I ignore everything which is frustrating. A number of people were saying rgb doesn't have jailbars and posting pictures. I'm certain whatever causes the jailbars in both s-video and rgb is the same problem, same with the rainbow banding. The jailbars I was getting from component as weak as they were they looked the same as the s-video jailbars.

[MEGADRIVE Jeroi]

I added solderless breadboard layout for testing AD724 or AD725 or similar Msop package chips.

[Guntz]

Trekkies, the best thing you can do here is to just ignore Drakon. If his opinion isn't useful for even related to the discussion (which tends to be the case), then it doesn't deserve a reply.

The ignore option is nice, but it would be even better if the user's name was blanked out...

[lumclaw]

And this is exactly how you act to people who you look down upon simply because they haven't soldered stuff to their systems. The issue with RGB is that if it's not the cable (Which I have not ruled out at all), all evidence points to it being the subcarrier signal causing interference. You instantly discredited this simply because it's not useful info for S-Video. You never once stopped to think "Well gee, maybe that would work for RGB since RGB never uses the subcarrier signal." You never once considered the idea that the two issues, while similar, are caused by different things since they are in fact different outputs that are generated differently.

I haven't soldered stuff to my systems either, yet less often get that kind of reaction from him. Perhaps being willing to show pics of my jailbars went a long way?

[Drakon]

I explained myself in pm as that's a better place to take all the mess. Anyway I found on my hdd the schematic of the neobitz ad724 circuit



This doesn't look right to me. Vsync looks wired into...voltage?

*edit* oh no that's right you set vsync at over 2v to use an external csync. Well....this circuit is exactly the same as the application circuit in the datasheet.

Here's the ad724 circuit wired into a genesis:



Yes it's wired correctly, if I had wired the colours wrong the number "2" would be red as the background which is normally blue is all red. The circuit my encoder is wired into is just like the datasheet so there's nothing wrong there. Also I can wire this encoder into my mvs and it looks fine (this was meant to be used in a neo geo after all). The ad724 simply just doesn't like the genesis rgb. Oh and also the ad724 still gets jailbars even when vdp pin 50 is disconnected from the pcb and the subcarrier isn't even coming in contact with the genesis pcb.

*edit*

This may be the problem. The ad724 is expecting the rgb inputs to be "0 to 714 mV AC-Coupled." Considering the genesis rgb lines have voltage connected to them with a resistor something tells me they're overpowering which is causing the colour party. I tried using resistors that didn't change anything, tried a capacitor, that didn't work either...oh well.

[MEGADRIVE Jeroi]

That schematic is fooked as I dont see for what is there that other chip or is it sync separator? And is that double sided board? So you seem to have Sync properly, RED and Green, where is the blue?

[lumclaw]

I'd almost think the error swapped blue and red. Red sky, blue tails. Yet sonic isn't yellow.
Huh.