SNES Mini NTSC - With a UK power supply ?

[JaFFa]

I've recently bought an RGB modded SNES mini and it has come with an AC power adapter.

I purchased a stepdown transformer http://www.amazon.co.uk/Stepdown-240-12 ... 8701TGV7AF which works fine but it is causing interference with both the speakers and the tv signal.

The console is hooked up via scart -> RGB on a sony PVM. Currently I am taking the sound out via the retrogamecable scart converter via phono to an AV receiver. This is then outputting into a pair of PMC speakers. When the unit is turned on with no sound I can hear a faint crackle in the speakers.

Similarly if I get close to the screen I can see very faint 'sparkles' in the black elements of the picture.

Currently the snes and tv are on the same plug socket (via a surge protector) and the Speakers / AV unit is on a different plug socket (in the same room) also via an APC surge protector.

What is the best course of action to remove the interference ?

Thanks,

Jaffa

[lettuce]

I believe the Snes Mini uses a 5.5x2.1mm jack socket, is centre pin negative and 10v, or though getting the exact voltage isnt critical as it goes straight into a regulator to drop it to 5v so you could get away with anything for 7.5v up to 10v.

Something like this should do the trick....

http://www.ebay.co.uk/itm/9-Volt-2-Amp- ... SwrklVVMd5

[JaFFa]

I believe the Snes Mini uses a 5.5x2.1mm jack socket, is centre pin negative and 10v, or though getting the exact voltage isnt critical as it goes straight into a regulator to drop it to 5v so you could get away with anything for 7.5v up to 10v.

Something like this should do the trick....

http://www.ebay.co.uk/itm/9-Volt-2-Amp- ... SwrklVVMd5

Thanks for the reply, so as long as the voltage is right it won't matter if I use DC or AC ?

Sorry I'm still learning on this kind of thing.

[BuckoA51]

No, that matters a great deal, never use an ACAC adapter on a console that is expecting DC input. You can go the other way around (DC adapter on a PAL SNES for instance) without any problems though.

[ApolloBoy]

I believe the Snes Mini uses a 5.5x2.1mm jack socket

No it doesn't, it uses the same jack as the original American SNES which is quite different than either the Super Famicom or PAL SNES.

[mvsfan]

If the pal megadrive uses a 10v DC power supply like the Genesis and U.S. snes do,

I know that you can power A US SNES with a Genesis model 1 supply, with an adapter like this one.

http://console5.com/store/super-nintend ... cable.html

You may have to use RGB only though.

I have a pal snes that im using a US nes supply to power, and it doesnt work over composite or s-video, only RGB because the US supply is 60 hz instead of 50. Its confused i guess.

[blizzz]

I have a pal snes that im using a US nes supply to power, and it doesnt work over composite or s-video, only RGB because the US supply is 60 hz instead of 50. Its confused i guess.

That's not the cause of your problem. Your TV simply can't decode the PAL colors. The console doesn't even know about the power frequency of your outlet, since the power supply converts it to DC, which by definition has no frequency. Japan has both 50Hz and 60Hz power, but all consoles output in 60Hz with NTSC (or RGB) colors.

[mvsfan]

Yeah its a pvm-14n6u though. it has a pal mode. it seems like it should work.

[the_crayon_king]

I've recently bought an RGB modded SNES mini and it has come with an AC power adapter.

I purchased a stepdown transformer http://www.amazon.co.uk/Stepdown-240-12 ... 8701TGV7AF which works fine but it is causing interference with both the speakers and the tv signal.

The console is hooked up via scart -> RGB on a sony PVM. Currently I am taking the sound out via the retrogamecable scart converter via phono to an AV receiver. This is then outputting into a pair of PMC speakers. When the unit is turned on with no sound I can hear a faint crackle in the speakers.

Similarly if I get close to the screen I can see very faint 'sparkles' in the black elements of the picture.

Currently the snes and tv are on the same plug socket (via a surge protector) and the Speakers / AV unit is on a different plug socket (in the same room) also via an APC surge protector.

What is the best course of action to remove the interference ?

Thanks,

Jaffa

For the audio:
I do know that RGB modded SNES/N64's put out a steady buzz sound on the audio that is particularly noticeable when the audio is quiet.
(I think this is from the RGB mod at least) I fix this by modding a 3.5mm audio jack to separate the audio and video lines.
I would assume the audio interference already present in SNES/N64's could be exaggerated by the stepdown converter somehow.
If you don't feel like modding your console even more you could look into coax shielded SCART cables.

For the video:
Try separating the PVM and console on different connections (not the same socket) and see if that does anything.
I know artifacts can be caused by scaling issues, but I do not know anymore about it as I don't even use PVMs.
I wouldn't think it was a sync issue but this page might have info http://shmups.system11.org/viewtopic.php?f=6&t=40150

I hope that was some sort of help to you.

[Voultar]

I've recently bought an RGB modded SNES mini and it has come with an AC power adapter.

I purchased a stepdown transformer http://www.amazon.co.uk/Stepdown-240-12 ... 8701TGV7AF which works fine but it is causing interference with both the speakers and the tv signal.

The console is hooked up via scart -> RGB on a sony PVM. Currently I am taking the sound out via the retrogamecable scart converter via phono to an AV receiver. This is then outputting into a pair of PMC speakers. When the unit is turned on with no sound I can hear a faint crackle in the speakers.

Similarly if I get close to the screen I can see very faint 'sparkles' in the black elements of the picture.

Currently the snes and tv are on the same plug socket (via a surge protector) and the Speakers / AV unit is on a different plug socket (in the same room) also via an APC surge protector.

What is the best course of action to remove the interference ?

Thanks,

Jaffa

For the audio:
I do know that RGB modded SNES/N64's put out a steady buzz sound on the audio that is particularly noticeable when the audio is quiet.
(I think this is from the RGB mod at least) I fix this by modding a 3.5mm audio jack to separate the audio and video lines.
I would assume the audio interference already present in SNES/N64's could be exaggerated by the stepdown converter somehow.
If you don't feel like modding your console even more you could look into coax shielded SCART cables.

For the video:
Try separating the PVM and console on different connections (not the same socket) and see if that does anything.
I know artifacts can be caused by scaling issues, but I do not know anymore about it as I don't even use PVMs.
I wouldn't think it was a sync issue but this page might have info http://shmups.system11.org/viewtopic.php?f=6&t=40150

I hope that was some sort of help to you.

A properly shielded cable will eliminate audio crosstalk.

[the_crayon_king]

A properly shielded cable will eliminate audio crosstalk.

Yes that is true that is why I mentioned coax. I suppose there are other types of shielded wire.
I am assuming we are on the same page when I specify I meant the audio must be individually shielded from the rest of the wires.

The 3.5mm audio jack is just something I do because it is a lot cheaper to separate the audio completely at least in my case.

Is the cable you have a properly shielded scart cable ?

[Voultar]

Coax is a medium used for Television and other data signals. I wouldn't be making an RGB cable out of it.



If you're going to roll your own RGB/AV cables, a multi-core shielded cable (with a drain wire) is ideal.



Tie the drain-wire to ground on both the Console connector and the SCART shield/ground, this will have a substantial impact on crosstalk noise.

[Guspaz]

Coax is used for any RF signals, including AV. They're very good and keeping out interference. All but the cheapest of Monoprices' RCA cables (be they for composite video, component video, analog audio, or digital audio) are made using coaxial cables. That said, it's thick and stiff by comparison.

[Voultar]

Coax is used for any RF signals, including AV. They're very good and keeping out interference. All but the cheapest of Monoprices' RCA cables (be they for composite video, component video, analog audio, or digital audio) are made using coaxial cables. That said, it's thick and stiff by comparison.

Sure, if you want to put BNC/N-Type/RF connectors on the back of an SNES Mini.

[Guspaz]

Coax is a type of cable, not a type of connector. Monoprice's composite/component/audio cables use RCA connectors on coaxial cables.

[Voultar]

Coax is a type of cable, not a type of connector. Monoprice's composite/component/audio cables use RCA connectors on coaxial cables.

Just so you know, the SNES has a proprietary Multi-Out connector with all A/V signals available. The point that I'm making which I believe you haven't quite managed to grasp is the fact that using coaxial cable as a medium for your RGB+ Audio cable on a SNES Mini is, needless to say, counter-intuitive....

And yes, I think it's blatantly evident that I know the difference between a connector and a cable medium.

[blizzz]

Coax cables would be ideal for signal quality in SCART cables, but as a result of the individual shielding the cables become thick and less flexible. retro_console_accessories sells coax RGB cables and I believe the packapunch cable from retrogamingcables also uses coax.

[Voultar]

I just don't see the point in using coaxial cable for consoles that have an SnR that can be curved with a polymer insulator. It's the analog band tech in me, I guess.