Replacement AC adapter for SCART to component converter

Damn, well it's not that then :\

 

Have you tried modding the SNES itself for component out?

 

I've considered added RCA connections for audio-only, but I'm not sure if that would solve anything, as I don't think interference between the console and AV receiver is the issue, since I've got an official SCART cable. The picture is perfectly fine, why would you suggest a separate component connection?

 

About the "simple" Snes component output mod, I personally consider this mod is still "immature". The mod you see around is all about connecting some wires directly to the encoder chip, but there are unsolved problems, at least with the Snes version i have here.

Firstly, the output of the S-ENC for R-Y and B-Y is not strong enough, you need to amplify it or the colors will look washed out.

I fixed this issue already on my personal system however there is a nasty DC offset on the chip output. I tried filtering that out with some caps but it will not work with my transistor amps, for some obscure reasons...
I commented on it in the Sega-16 thread, but nobody offered a solution. I plan to work on it later anyway... I can mess around and maybe find something but ideally i'd need someone more knowledgeable who could help me fix it for good.
http://www.sega-16.com/forum/showthread.php?20732-Easy-SNES-SFC-YUV-component-video!/page25

 

Again though, I'm happy with the component I get with my SCART to component converter, so why are you guys talking about a component mod? Unless the audio is somehow connected to this..?

 

There's no second hand outlets comparable to Goodwill, Value Village, or anything in Australia? The specs of a power adapter like you need are so generic it's baffling to an American like myself.

 

Because it seems from how you describe the problem, that this issue occurs not with the SNES alone but happens when you use it with the RGB-component converter.
Having the Snes outputs Component natively would render the converter unneeded, and the noise problem very likely bypassed. Assuming the problem is generated by the interaction between the Snes and the Rgb-Component converter, it seems like a good potential solution to me.

But then as i said, I believe the Snes component mod still needs work.

 

Yea we have Life Line, Saint Vinnie's and the like. But mostly they are full of clothes, broken toys etc. Very hard to find anything decent.

 

That's possible, but in addition to the SNES, I also use a Sega Saturn, Nintendo 64 and Sega Mega Drive on the same converter, and the problem only appears with the SNES.

 

You mean you are not sure? That would be the first thing to verify in the troubleshooting chain. Do you have a standard composite nintendo cable?

 

I say "possible" because although it looks like the issues might be the console itself, since there's no buzz with the other consoles that use the same converter, it was also mentioned previously that the SNES just might be more sensitive than the other consoles.

I don't have a composite cable, however I did have a SCART cable that had separate RCA stereo cables that split off from the console end of the cable. I still heard a buzzing sound with this cable, but this was before I had the new plug adapter that solved the buzz with my other consoles. So it's possible they would be buzz-free now if I still had them :\

 

Well, if you unplug everything from the Component converter.
AC adapter from the wall and component cables to TV are disconnected.

You only leave the audio connection. Still noisy?

 

Keyword there is "did have", I no longer have that cable I *think* I've got an unofficial composite cable somewhere, though I'm not sure how useful it would be, since it's probably unshielded.

 

Hey guy's found something interesting with my RGB/component converter. I have 2 of these bad boys, 1 for my retro TV, the other for my dreamcast to my LCD TV (yes I know VGA is better).

When I hooked it up to LCD TV I had awful looking lines going over the screen, I thought shit what is going on here, swapped cables over, swapped the converters over..nothing, same thing. So I swapped the power supplies over. Fixed it!

The first one I got (bloody hell 2-3 yrs now?) it came with a 120V adaptor, useless as tit's on a bull here so I bought a power supply from Jaycar with close specs (12vdc 0.4amp). I used it on my retro TV for a while, but didn't really notice (or maybe ignored?) these faint lines on the screen. When hooking it up to the LCD TV these lines were AMPLIFIED, holy shizzle-my-nizzle it was bad!

The 2nd one I got came with a 240v power supply (albeit with a shitty adaptor that I replaced), this one works fine.

I tried further, I have an older variable output (via a switch) power supply (still switchmode) and this worked a charm as well. So this power supply (paid good money for it) that I got from Jaycar is a piece of shit!

With the variable power supply (I noticed when doing the audio mod the RGB/Component converter has a standard 7805 regulator in it) I switched it down to 9V and ran it for a while with no issues. I have a bucket load of 9VDC adaptors, so I will make one to suit.

It actually beats me why the hell these guys want to shove 12Vdc into them, the +ve pin goes straight (there is one small filter cap there) to the input leg of the 7805. These get pretty warm to with 12VDC, there is no heatsink on the voltage regulator, so I reckon 9Vdc will be much kinder to it.

 

Hmmmm, so you're thinking the ac adapter might still be the cause of my audio issues with the SNES? Even if I'm not getting the picture lines you're getting and the ac adapter is 230v?

 

No probably not, the power supply these come with seem pretty good. You could just give it a go, if you have a 9vdc power supply with centre positive 2.1 x 5.5 dc tip on it.

Sometime today I will be doing the same.

 

How did you go with the new adapter? Notice any difference?

I played my SNES today, this time with my speakers instead of my headphones. I didn't notice any buzzing this time! It could be that the better converter has lessened the buzz to the point where you can only really hear it when you're using headphones. But it would be nice to be rid of it altogether...

 

Yes replacement adaptor fixed the problem. I have quite a few different types, the best type was the type I didn't expect. They were fairly cheap ones bought from ebay, on the outside though they look like a very nice quality power supply. They have written on them "Mobitronic". I also swapped the power supply for my other RGB converter. These power supplies are a big over-kill at 9VDC 2amp, but at least they work nice and it is what I had laying around.

The power supply I expected to be good (they are fantastic for consoles, never had any issue's) had very slight interference, but not as bad as the original power supply I was using (the Jaycar one).

Again I have no idea why they want you to shove 12vdc into these things, they only have a 7805 voltage regulator in them. All it does is create more heat.

 

Just to be clear, you were having the same issue as me right? A buzzing sound that gets louder when the console displays a bright image, and seems to effect only the SNES? And you're using the same, unbranded converter that I am?


If so, where did you get that ac adapter from??

 

No matey, had lines across the screen or slight fuzzy lines scrolling up the screen.

As to where I got the adaptor, no idea as it was a while ago. As you also know, these ebay sellers swap and change their suppliers so it would be pot luck.