Easy SNES/SFC YUV component video!

[Lastcallhall]

Seems high, how many sq in is the pcb?
I've laid out numerous pcbs and had them fabbed with Dorkbot, they do a medium run order that's $1/sqin! Great deal for US fabbed, 6/6 spec, double sided purple solder mask and double sided silk screen, and gold plating!
Are you trying to keep it through hole except the ba6592/4?
Let me know if you need help, i'm totally willing!

Board is 2" x 2", and yes, I want to keep it through hole.

[Ace]

Hey guys - I know you are currently discussing the circuit (and potential PCB) for the BA6592F-based RGB-YUV project, but I wanted to comment on Ace's post back on page 6 regarding adding component video to a launch model SNES as I have that one.

I pretty much followed what was here - http://www.sega-16.com/forum/showthr...l=1#post483965

My NPN was your typical 2N3904 from Radio Shack. After completing the circuit yesterday, the colors seemed a bit over-driven on my plasma. I ended up adding a 75 ohm resistor to the end of the output for the Pb & Pr, and it scaled the colors back to something much easier on the eyes (at least when paired with my display). I do still have a small issue of the faintest of vertical bars, however my circuit is also very much in prototype mode as I have fairly long wires hanging outside of the SNES.

A few questions -

1: Why put 66 ohms on the Y output? Is the Y output for S-Video (I grabbed my Y signal from the multiout connector) not spec'ed the same for S-video & Component video? I would just assume use the signal as it was, however I stuck with the 33 ohm x 2 series take that Ace mentioned in his post.

When I first got Component video out of my launch-model Super NES, I had done many changes to the TV's settings via Service mode without really paying too much attention to my TV's default settings. I managed to get the settings back to what they might have been with the help of someone who has the same TV I have (Electrohome 27E510 CRT), and 66ohms actually makes the picture too dark and a bit too saturated. For some reason, direct Luminance in S-Video looks fine (this is how my S-Video cable is wired), but when using direct Luminance through Component, the colors seem too dull. A single 33ohm resistor is actually the way to go here.

2: A user on nesdev mentioned going a different route for the Pb & Pr outputs by using a PNP transistor & going through your typical 220 uf + 75 ohm on your output line. Any thoughts on this? http://nesdev.parodius.com/bbs/viewt...&postorder=asc

I might try this at some point, though I'm not entirely sure why a PNP transistor is used in place of an NPN transistor. Still, I've got a few 100uF caps laying around, so I'll give this a shot in my external RGB to Component box.

3: I suppose this is mostly for Ace, but which outputs did you use on your SNES? It looks like you could panel mount RCA connectors, but not without tearing out some of the RCA shielding between the sound box and the back of the case. I suppose you could have abandoned this in favor of your external solution, but I think I am going to pursue the direct RCA connection route if possible.

I used the multi-A/V out for Component. Eliminated the red and blue outputs and wired B-Y and R-Y there. I was none too impressed with the Super NES' RGB, so not having RGB out of the multi-A/V out is not a big deal for me. Besides, I've got an RGB-modded Super NES Mini with VASTLY superior RGB to what a launch-model Super NES is capable of.

Soon, though, I will attempt to make a converter based off the Nintendo S-ENC/ROHM BA6594F encoder. I had tried something at first using the S-ENC from my SNS-CPU-GPM-01 Super NES (though now, the video has a MASSIVE yellow tint, so I'm going to remove the encoder in its entirety and just use RGB on this system as from what I've seen in a schematic showing the RGB output of the SNS-CPU-GPM-01 and SNS-CPU-GPM-02 motherboards, the RGB is amplified separately from the encoder, so it should still work even with no encoder in place).

@Ace
I couldn't get this to work in place of the jrok encoder on a PC10 modded nes, any idea what I should look for?
I tried numerous variations of the circuit, but did not try a different 6592 yet.
I know the nes works through the jrok though, here's a vid.

What does the NES do when you run its RGB into my converter circuit?

[akaviolence]

What does the NES do when you run its RGB into my converter circuit?

Most of the trials yield only black screen with no indication that the tv is trying to accept any signal.
Only one trial yielded an image, but it was dark and half scrambled, weird.
I'm gonna look at it again this week and make note of which trial yielded the scrambled image.

[evilevoix]

can someone make one for me? I have a SNES.

[Ace]

If you have a Super NES with the BA6592F or S-ENC encoders, you could just use the Component outputs of the chips already in the console.

By the way, while sifting through UTSource, I discovered they actually stock the Nintendo S-ENC encoder. I'm gonna desolder the one on my SNS-CPU-GPM-01 Super NES (I'm getting all sorts of video issues since resoldering the chip in place) and see how to get good Component video out of it. I've asked for a quote to see how much one of those chips costs, and if the S-ENC could give the same results as the BA6592F with less/cheaper parts, I may ditch the BA6592F and use the S-ENC instead.

EDIT: Bummer... UTSource doesn't have any S-ENCs in stock. They do, however, have 100 BA6592Fs in stock for $1 each. So, with Lastcallhall's quote for 100 PCBs at $250, this would bring up the cost of parts I can't get locally to $350. The capacitors, transistors and resistors are all easily attainable locally, so I would like to get a group order for those 100 PCBs and 100 encoders.

[evilevoix]

can someone make one for me? I have a SNES.

anyone please?

[Lastcallhall]

If you have a Super NES with the BA6592F or S-ENC encoders, you could just use the Component outputs of the chips already in the console.

By the way, while sifting through UTSource, I discovered they actually stock the Nintendo S-ENC encoder. I'm gonna desolder the one on my SNS-CPU-GPM-01 Super NES (I'm getting all sorts of video issues since resoldering the chip in place) and see how to get good Component video out of it. I've asked for a quote to see how much one of those chips costs, and if the S-ENC could give the same results as the BA6592F with less/cheaper parts, I may ditch the BA6592F and use the S-ENC instead.

EDIT: Bummer... UTSource doesn't have any S-ENCs in stock. They do, however, have 100 BA6592Fs in stock for $1 each. So, with Lastcallhall's quote for 100 PCBs at $250, this would bring up the cost of parts I can't get locally to $350. The capacitors, transistors and resistors are all easily attainable locally, so I would like to get a group order for those 100 PCBs and 100 encoders.

Im in for $70.00 worth of parts (20 encoders and boards).

Also, shipping on the boards will be $25.00 (we can divide that after we get the order filled), and will take 14 days for manufacture. That should be the same time for the encoders, based on my last experience with UTSource. Not sure what their shipping would be, but I can't imagine it would be much.

Ace, did you want to start a group buy thread?

[TrekkiesUnite118]

I'd probably be interested in 2 of them for my Saturn and Genesis if you get boards made for it and it comes out cheaper than getting those SCART to YUV convertors.

[Chilly Willy]

Depending on the final price, I could go for 5 to 10... at least 5.

[ApolloBoy]

anyone please?

As Ace said, your SNES may have an encoder that outputs component already. Take a look and see if it has the BA6592 or BA6594AF and then it's just a matter of doing a simple mod.

[villahed94]

If you're willing to use Wester Union or anything like that, I'll be in for 10 encoders.
I can get the boards locally...

[Ace]

Im in for $70.00 worth of parts (20 encoders and boards).

I'd probably be interested in 2 of them for my Saturn and Genesis if you get boards made for it and it comes out cheaper than getting those SCART to YUV convertors.

Depending on the final price, I could go for 5 to 10... at least 5.

If you're willing to use Wester Union or anything like that, I'll be in for 10 encoders.

Noted.

Also, shipping on the boards will be $25.00 (we can divide that after we get the order filled), and will take 14 days for manufacture. That should be the same time for the encoders, based on my last experience with UTSource. Not sure what their shipping would be, but I can't imagine it would be much.

Shipping's $4 from UTSource, but sometimes, it can be SLOW AS HELL! I once had to wait for just over 3 weeks to get two YM2413s from them (and wait was nothing more than a waste of time because one chip was fake and the other didn't even work).

Ace, did you want to start a group buy thread?

I didn't think of that, but I will start one at some point (not right now as I want to test the compatibility of my converter circuit as much as possible).

Speaking of which... Trekkies, you may want to make note of this: the converter works perfectly on the Sega Saturn. I just built a custom dual RGB/S-Video cable using a broken S-Video cable, a leftover DB9 (this carries the RGB) and some leftover red and white RCA cables. I would have never imagined the Saturn looking this good; 3D games looks really nice (they don't actually look too blocky - textures look REALLY good) and the 2D games... wow. The Sega Ages releases in particular look like if you were using an arcade monitor to play the games on; VERY vibrant colors and a very sharp picture. I've got some pictures of After Burner II, Daytona USA Championship Circuit Edition and Sega Rally Championship on my laptop, which I'll show later on as I don't have access to my laptop right now.

I tell you, after having used the Saturn in S-Video for so long and now using the Saturn in Component, S-Video just doesn't stack up to Component. In S-Video, the picture is quite a bit blurrier, dithered graphics tend to flicker, there's less color variation and 3D games look blockier (as a small note, my Saturn doesn't have the usual CXA1645, but rather some Fujitsu encoder whose model number I can't remember).

[lumclaw]

I never could get behind the svideo fandom. Beats composite obviously, but...

[Drakon]

I never could get behind the svideo fandom. Beats composite obviously, but...

It all depends on the tv. On a good crt there's barely any difference between component and s-video. Heck even on my capture devices there isn't a huge difference between component and s-video image quality.

[madmax2069]

It all depends on the tv. On a good crt there's barely any difference between component and s-video. Heck even on my capture devices there isn't a huge difference between component and s-video image quality.

I own a SONY Trinitron TV it has composite, component, and s-vid. I have used s-vid on it before but not component, I always wondered if I would see a noticeable difference in picture quality on this set. I know I do between composhite vs s-vid