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

[ApolloBoy]

Wow, that's quite the difference! I'll have to start offering this mod now, what value resistor did you use?

[lastcallhall]

100 Ohm. I may tinker with that value a bit, maybe a 220 or a 330 and see what the difference is.

[roflmao]

Some comparison photos. S-video is on the left, composite (pulled from A23) is on the right:

Looks amazing! 

[Keith Courage]

It would be awesome if you could write out what pins you used and parts etc... for the community here that others would know how to do the upgrade.

[thesteve]

all the info is in a post above. (post 34)
thats how LastCallHall was able to do it

[lastcallhall]

all the info is in a post above. (post 34)
thats how LastCallHall was able to do it

What he said.

Really, credit for this goes to thesteve, as he was the one who provided the info; I just had the system to use as a guinea pig.

Also, @thesteve: if you look at the comparison photos, especially the download package I linked to, you can see some noise when using composite. I just ran the composite signal straight from the EXP port; do you think if I placed a cap in series with the signal it would clean that up?

[thesteve]

i had a TG16 on the bench for region mod so i tested some signals and built it.
the reason i was thinking on the subject was this thread.
i just installed it in my DUO and used a 75ohm resistor.

[thesteve]

one of the high res pics

[SignOfZeta]

These look to be taken from a capture card. Is all that jpeg compression noise coming from there, or can you reduce that somehow?

[SignOfZeta]

ya could go simple, and just pull S-Video right off the huc6260

the cap is 0.001uf
the transistor i tested with is an S9013
40 is pin 40 of the huc6260
comp is anywhere you can get composite video (I tapped the vid pin on the RF modulator)

Wait...that's it?

[thesteve]

thats it 3 parts

[SignOfZeta]

So the Hu6220 outputs a luma signal, but not a desecrate chroma signal. Is this common? I assume I would get better results with a RGB to s-video encoder like a NeoBitz (if I could actually get the f*cker to work, which I'm sure I couldn't)?

Anyway, I guess I'll try this soon.

[thesteve]

the chroma signal is there too it just requires another amp (inverting) from pin 20.
the best way is to use a high speed op-amp 2 channel for luma and chroma

[thesteve]

the neobits is less than perfect too, due to the sync offset.
the 6260 sync is delayed for final mix, causing it to not properly align with the RGB signals

[Bonknuts]

So the Hu6220 outputs a luma signal, but not a desecrate chroma signal. Is this common?

  Didn't see the links I posted earlier? Here and here. Not only does it output a clean chroma signal, it actually outputs both separate color components. The final step of the quadrature amplitude modulation to make C is done in the analog circuit (two lines are tied together). All VCE chip models for the PCE console systems have this (there are two revisions). I've never taken apart the portable PCEs, but I've been told they use the same VCE (huc6260) chips as well.

 It outputs 4 lines: Y + sync, Color burst (the reference signal for chroma), R-Y and B-Y.

I assume I would get better results with a RGB to s-video encoder like a NeoBitz (if I could actually get the f*cker to work, which I'm sure I couldn't)?

 This method gets you the same custom/unique color space that the PCE always had, just nice and clean. RGB out on the PCE has a different color space. If you care about real PCE colors, this would be the way to go IMO.