Where can I tap a sync signal for s-video?

[thesteve]

this is a close-up of my ship in image fight showing S-Vid VS Composite (2 pics)
note how the color bleeds between objects on composite
S-Vid
Composite

[Keith Courage]

I just made a diagram to help those of you out who want to upgrade your video to S-video. Especially since I was confused myself when I first did this without seeing any pics. There is also info on where to tap the needed signals for both a DUO system or a standard TG16/pc engine.

[city41]

That diagram is great. I think I will give this a shot on my spare TG16 and if that succeeds do it on my main one. Thanks Keith!

[SignOfZeta]

Nice! I have a long weekend coming up. I really need to do this.

[NightWolve]

Thanks Keith! Awesome! I'm gonna do it for sure, was toying with the idea, but now having full/clear information, I think it'll be another fun project to do having already done the cap replacement on my Express! Oh, if you can sell me all the parts, that'd be cool! If you got extras!

[YAGRS]

Question from someone who isn't very tech savvy—will this work with the Turbo CD? If not, has anyone come up with a solution for getting S-video from a Turbo CD?

[thesteve]

from the cd base it can be done with an encoder, but not this way

[YAGRS]

And that, in all likelihood, is beyond my abilities at this point. Maybe someday.

[Keith Courage]

There is no reason to put an S-video jack in the CD base. Installing one in the turbografx system itself would be easiest and will work for both chip and CD games. You would just want to use the CD base still for the audio.

[ApolloBoy]

After having done this mod to a couple of PCEs, I've found that 220 ohms is the "sweet spot" for the resistor on the luma amp. Part of my reason for selecting it was because I didn't have any 200 ohm resistors on hand and because I wanted to try a higher value. It's been tested on three different TVs (two Sony PVMs and a big Toshiba CRT) and looked fantastic on all three. I was amazed at how great it looked on my friend's 20" PVM, it looks very close to RGB!

[NightWolve]

Hm, you pretty sure about that 220 ohms? Sucks about the uncertainty here, but if you say 220 Ohms is the "sweet spot," I'm inclined to use it.

Keith, I take it you're not interested with the idea of s-video mod packs, selling everything needed ready-to-go ? Wanna put my order in with DigiKey if not. BTW, in general, is DigiKey the preferred retailer around here for electrical components ?

[YAGRS]

There is no reason to put an S-video jack in the CD base. Installing one in the turbografx system itself would be easiest and will work for both chip and CD games. You would just want to use the CD base still for the audio.

Okay, this is what I was wondering. I didn't know if the CD video had to come out of the CD base or not. If I can mod my TG-16 for S-video, connect the CD base, and use the S-video for both, then I'm going to try this mod.

[BlueBMW]

Hm, you pretty sure about that 220 ohms? Sucks about the uncertainty here, but if you say 220 Ohms is the "sweet spot," I'm inclined to use it.

Keith, I take it you're not interested with the idea of s-video mod packs, selling everything needed ready-to-go ? Wanna put my order in with DigiKey if not. BTW, in general, is DigiKey the preferred retailer around here for electrical components ?

I typically use mouser but also ebay for odd things like logic chips.

[bust3dstr8]

What about using trimmers? Use a 0.5K and dial it in until you get the best result.
There are vary small ones made that are not much bigger than a resistor.

[futureman2000]

Did this mod today, it looks fantastic! Looks way better than composite, which isn't that bad to begin with on these consoles. Also, it was nice to get the plug all on the back of the console... no more goofy av cable coming out of the left side! I didn't try any other resistor values- 220 seems just right.