Started by Link83, April 29, 2008, 10:31:00 PM
Quote from: Link83 on July 15, 2008, 10:21:41 AMAlso, for anyone who may be interested in opening their Official Nintendo Scart Cables I took this picture and added some notes on how best to do it (The notes are abit small I know, but if you save the picture and then open it you can zoom in and read the text ):-
Quote from: Link83 on April 29, 2008, 10:31:00 PMI managed to find my Official PAL Nintendo Composite cable and there appears to be more than just a resistor - there is also a 220uf capacitor aswell - anyone care to explain whats going on!
QuoteCan anybody tell me what value resistor it uses? I guess its 180ohm. I have tried to work it out by the color banding but am not very good at it!
Quote from: Link83 on January 23, 2009, 01:44:31 PMI just wanted to update that I tested both a PAL SNES/N64 Composite cable and a PAL Gamecube Composite cable on a PAL N64 console.Visually I couldnt see any difference using either cable (but maybe im not looking hard enough)I then decided to measure the DC offset from the PAL N64. Using the PAL Gamecube Composite cable (75ohm resistor to ground and 220uF capacitor in series) it measured 0.00V as I expected.Next I tried the PAL SNES/N64 Composite cable (75ohm resistor to ground) and somewhat surprisingly got readings betweens 0.7V and 1.35V DC - varying according to how bright the game picture was. During gameplay it seemed to average out at about 1V DC.I am not sure what effect this DC offset would have on the picture quality, but I dont think it would be for the better. I have read in many audiophile forums that having a DC offset on headphone amplifiers higher than 20mV (0.02V!) can have a detrimental affect on the sound and can damage the speakers , so I assume a 1V DC offset on Composite video would be the same/similar(?)All this suggests that to me their definitely should be a 220uF capacitor in series on the PAL N64 Composite line aswell as the 75ohm resistor to ground, and that Nintendo just cheaped out on making the PAL N64 Composite cable because they could get away with it I havent been able to test the PAL SNES yet as I have just accidentally blown the fuse on my console (Even though I 'discharged' it for 10 seconds first) but when I get a new fuse I will compare the PAL SNES aswell and update this thread.Sorry if anyone finds this info boring - I realise it wont interest many as its only Composite Video!
Quote from: AlmostOriginal on January 13, 2013, 06:20:10 AMI recently added the capacitor on my Composite cable but it stopped working. When i remove the capacitor the cable works again.
Quote from: Link83 on July 20, 2008, 03:35:28 AMAlso I thought it might be good to point out that prior to recieving this Official SNES Scart cable, I had been using an Official Gamecube Scart cable on my SNES with no problems whatsoever. It could just be because my TV is able to handle the signal levels better than other peoples (which often show no picture or fades to black after a few seconds)Alternatively could it be there is a difference on the video lines of my PAL SNES? It is the very last revision made in 1995, with the code SNSP-CPU-1CHIP-01 printed on the motherboard. Heres some pictures of my SNES which also show the video lines:-
Quote from: viletim on July 20, 2008, 04:32:23 PMRegarding the RGB output circuit of the PAL SNES - I've just pulled apart one of mine (1992 model) and had a look at the board. Like MKL said, there's only two 30 ohm resistors there! Something's not right. I'll trace it out again...Maybe Nintendo revised their video output circuit in later models. You put a cap in series with the video from the 1992 PAL SNES and nothing will come out.
Quote from: viletim on July 27, 2008, 08:50:15 PMI examined the internals of my 1992 PAL SNES and can confirm the presence of a 30 ohm resistor in series with red, green, and blue. The circuit looks like: If you put a capacitor in series with the signal it won't work. Nintendo must have changed the circuit somewhere between 1992 and 1995. I presume that their official cable works perfectly with both versions.
Quote from: Link83 on January 16, 2009, 04:34:40 AMSo it is different to the PAL Gamecube Composite cable as that had a little circuit board with a 220uF capacitor in series aswell as the 75ohm resistor to ground (See first page of this thread for pics)
Quote from: unshe on July 31, 2013, 12:54:13 AMABout resistors/caps on CVBS.. it is used only for Sync, so if the sync signal is still "good for the tv" it will work. So resistors or caps on CVBS are not so important...