Easy SNES/SFC YUV component video!

[Ace]

The BA7230LS is DEFINITELY more durable than the BA6592F. The one I used for my first working prototype BA7230LS-based RGB to Component converter has had its pins bent quite a bit on multiple occasions and it's never failed, whereas with the slightest bending of any pins on the BA6592F, you risk irreversibly damaging the chip.

[airs]

Got the transistors and resistors today - wired it up but same result...argh!

[Ace]

What the hell?

Really weird... do you have any other TV to try it on?

[airs]

Do I need a 66ohm resistor for the wire from multi av pin 7 (luma)???

Edit: I took it all apart and did it again, this time it looks much better but the colors are still not correct - washed out looking and reds are not vibrant enough...

Edit 2: Looking at your schematic for the converter box you built, you have some 33ohm and 147ohm resistors as well as amping luma directly from the chip. Should I be using these in the SNES application?

BA6592F RGB to Component converter.jpeg

[Ace]

That's an idea. But I really don't get what's with your console. What transistors are you using?

Oh, and ignore the 66ohm resistor on Luminance, that just makes the picture too dark.

[airs]

The transistors are - link

[Ace]

Hmm... it's the right type, so... that rules out the transistor being of the wrong type. Mind taking a picture of your wiring?

[airs]

Update - one of my transistors was bad (wtf?)

Replaced it and it works beautifully. I'll try to post pics of the circuit I made soon. Fun project, thanks for the help Ace.

Now contemplating if its worth adding rca jacks for audio?

[Ace]

I would personally just route the B-Y and R-Y outputs to unnecessary pins on the multi-A/V out as well as make a custom A/V cable with both Composite and Component outputs so I can play using Component and record using Composite and vice-versa.

Unless you've already added Component jacks, in which case, you might as well make it complete and add in Stereo audio via RCA jacks.

[KKEYSER4063]

Hey all. Sorry to necro this thread, but I've been reading through your guys' work with the BA6592F and was wondering if anyone could help me out with a mod I am working on. I have a stock N64 with board revision NUS-CPU-04, and I would like to see if I could get Component Video out of it. I've seen a few mods online to pull RGB out of this model N64, but Component Video would be more handy for my uses, and I just so happen to have an extra early-model SNES laying around, one with the BA6592F video encoder.

So... my question is this: what would be the best way to wire up the BA6592F into an N64? I've been pouring over the datasheets, and it seems to me that the ENC-NUS chip (which I believe is a BA7242F chip, if I'm not mistaken - here is the datasheet) and the BA6592F are rather similar... could I simply pull the ENC-NUS from the N64 and wire the inputs that fed it into the BA6592F? I'm not yet very knowledgeable on electronics, but it looks like the voltages are identical and that this SHOULD be a pretty straight-forward swap, though the mostly-Japanese schematic of the BA6592F is a bit daunting. :\

I should think that, from the ENC-NUS traces to the BA6592F:

Pin 1 wired to Pin 22
Pin 2 wired to Pin 21
Pin 3 wired to Pin 20
Pin 4 wired to Pin 5
Pin 5 wired to Pin 8
Pin 6 wired to Pin 16
Pin 7 wired to Pin 2
Pin 8 to ???
Pin 9 wired to Pin 19
And Pins 10-14, being the N64's normal outputs (and Vin & Gnd for an internal driver, something the BA6592F does not have), would be ignored.

I am not sure if this is right, and am especially puzzled by Pin 8 on the NUS. What is the 3.58MHz or 4.43MHz pulse signal input for? Is this similar to the Pedestal Clamp Pulse input, the Pin 3 of the SNES video encoder? Not really sure on this one...

Also, one last question before I end this long-winded post: how would I best amplify the Luminance output of the BA6592F, to run that output to a television? I understand that, when modding an SNES for Component Output, it is preferable to grab the Luma from the AV Multi-Out rather than the video encoder itself, given that the Luma there is already amplified and TV-ready. However, it seems to me that the signal amplification process in an N64 is carried out in the ENC-NUS chip itself, which I intend to bypass with the BA6592F. Is this a good idea? Is there a good way to amp the Luma from the SNES's video encoder, or would I be better off trying to pull the N64's native Y-out in some way?

Many thanks to everyone who has so far posted in this thread - your outstanding work has been most helpful. And an additional thank you to anyone who took the time to read this novel-of-the-electronically-ignorant of mine - I hope that I am not too far off base in my interpretation of this mod, and I would greatly appreciate any help to put me in the right direction (or to tell me that I'm doing it wrong, whatever the case may be. :P )

[gcfernandez]

Hey all. Sorry to necro this thread, but I've been reading through your guys' work with the BA6592F and was wondering if anyone could help me out with a mod I am working on. I have a stock N64 with board revision NUS-CPU-04, and I would like to see if I could get Component Video out of it. I've seen a few mods online to pull RGB out of this model N64, but Component Video would be more handy for my uses, and I just so happen to have an extra early-model SNES laying around, one with the BA6592F video encoder.

So... my question is this: what would be the best way to wire up the BA6592F into an N64? I've been pouring over the datasheets, and it seems to me that the ENC-NUS chip (which I believe is a BA7242F chip, if I'm not mistaken - here is the datasheet) and the BA6592F are rather similar... could I simply pull the ENC-NUS from the N64 and wire the inputs that fed it into the BA6592F? I'm not yet very knowledgeable on electronics, but it looks like the voltages are identical and that this SHOULD be a pretty straight-forward swap, though the mostly-Japanese schematic of the BA6592F is a bit daunting. :\

I should think that, from the ENC-NUS traces to the BA6592F:

Pin 1 wired to Pin 22
Pin 2 wired to Pin 21
Pin 3 wired to Pin 20
Pin 4 wired to Pin 5
Pin 5 wired to Pin 8
Pin 6 wired to Pin 16
Pin 7 wired to Pin 2
Pin 8 to ???
Pin 9 wired to Pin 19
And Pins 10-14, being the N64's normal outputs (and Vin & Gnd for an internal driver, something the BA6592F does not have), would be ignored.

I am not sure if this is right, and am especially puzzled by Pin 8 on the NUS. What is the 3.58MHz or 4.43MHz pulse signal input for? Is this similar to the Pedestal Clamp Pulse input, the Pin 3 of the SNES video encoder? Not really sure on this one...

Also, one last question before I end this long-winded post: how would I best amplify the Luminance output of the BA6592F, to run that output to a television? I understand that, when modding an SNES for Component Output, it is preferable to grab the Luma from the AV Multi-Out rather than the video encoder itself, given that the Luma there is already amplified and TV-ready. However, it seems to me that the signal amplification process in an N64 is carried out in the ENC-NUS chip itself, which I intend to bypass with the BA6592F. Is this a good idea? Is there a good way to amp the Luma from the SNES's video encoder, or would I be better off trying to pull the N64's native Y-out in some way?

Many thanks to everyone who has so far posted in this thread - your outstanding work has been most helpful. And an additional thank you to anyone who took the time to read this novel-of-the-electronically-ignorant of mine - I hope that I am not too far off base in my interpretation of this mod, and I would greatly appreciate any help to put me in the right direction (or to tell me that I'm doing it wrong, whatever the case may be. :P )

Pin 8 on the ENC-NUS is the subcarrier input, which is only needed if encoding to s-video or composite. You don't need to wire pin 8 to the BA6592 for it to generate it's component signal.

You won't need pin 6 or 9 from the ENC-NUS either. Just VCC, GND, SYNC, and of course RGBin.

It would be best to build Ace's circuit here: http://www.sega-16.com/forum/showthr...l=1#post484849
so that the Pb and Pr channels will be properly amped.

As for properly amped luma, the N64 has the same multi-av pinout as the snes, so you should be able to grab it from pin 7 of the av out connector

[KKEYSER4063]

Thanks for the fast reply! I will do as you have suggested - however, concerning Ace's circuit, I should only need to put the transistors and resistors on the output lines, correct? Ace's circuit was designed to take external RGB signals from a console - signals that were ready to output directly to a television. I will be utilizing internal RGB signals, those that still need to be amplified before they are ready for TV. Am I correct in this?

[gcfernandez]

Thanks for the fast reply! I will do as you have suggested - however, concerning Ace's circuit, I should only need to put the transistors and resistors on the output lines, correct? Ace's circuit was designed to take external RGB signals from a console - signals that were ready to output directly to a television. I will be utilizing internal RGB signals, those that still need to be amplified before they are ready for TV. Am I correct in this?

yea output half of the circuit..i should have been more clear

[MaxWar]

I just did this easy component mod on a SNS-CPU-GPM-02.

At first i connected green on pin 23 of the S-ENC but the image, while sharp, looked too bright and washed out.
I switched It to pin 7 of the AV out, its better.

The colors are still different from s-video, Im not sure which one i prefer. S-video felt warmer.
I guess ill play with it a little more, with different games.

Certainly did not help for the blasted vertical bar in FF III though.

Did anyone successfully do this mod on a 1chip Snes?? By transplanting an encoder or something? Sry if this has been discussed before, I do not feel like reading the whole 24 pages of thread. ( i read a good part though )

[Drakon]

I can't find the BA7230LS on ebay or anywhere. Can I buy a BA7230LS circuit / kit from you? It doesn't need any special kind of rgb plug just needs all the parts