Loccy Posted January 15, 2007 Share Posted January 15, 2007 Subject line says it all really - do either of the video mods in the 7800 FAQ work on a PAL 7800? Has anyone done one on a UK machine? Having had the thing open I've noticed there's two points very near the modulator labelled Video and Audio. Is it too much to assume that these are actually exactly what they say, and could I just hook into them to get some video/audio feeds out of my 7800? (Have been desperately trying to get a decent picture out of the thing all weekend but the poxy RF modulator just isn't playing, given UK TV channels' close proximity to virtually every frequency I can get the thing transmitting on.) Quote Link to comment Share on other sites More sharing options...
Loccy Posted January 15, 2007 Author Share Posted January 15, 2007 Sorry, it's just occurred to me - I have previously searched the forum for this but most of the existing topics on this subject point to off-site links which are dead. Also - I am not particularly married to getting totally absolutely perfect output. I can barely get a picture tuned in from the modulator, so anything is going to be an improvement. Quote Link to comment Share on other sites More sharing options...
+Mitch Posted January 15, 2007 Share Posted January 15, 2007 You can try this to start with. Mitch Quote Link to comment Share on other sites More sharing options...
panamajoe Posted January 16, 2007 Share Posted January 16, 2007 You can try this to start with. Mitch or buy a french 7800 with SCART ouptut, works great with PAL TV sets... Quote Link to comment Share on other sites More sharing options...
Loccy Posted January 16, 2007 Author Share Posted January 16, 2007 or buy a french 7800 with SCART ouptut, works great with PAL TV sets... Really? Wouldn't there be a PAL versus SECAM issue? Quote Link to comment Share on other sites More sharing options...
pepax Posted January 16, 2007 Share Posted January 16, 2007 I asked Schmutzpuppe who has already done the modification and he advised me to use this circuit along with the values he mentioned in this thread and connect the wires according to the page mentioned a few posts back. Can't describe the result because I haven't even started yet. Quote Link to comment Share on other sites More sharing options...
panamajoe Posted January 17, 2007 Share Posted January 17, 2007 or buy a french 7800 with SCART ouptut, works great with PAL TV sets... Really? Wouldn't there be a PAL versus SECAM issue? i have one and it works just fine on my PAL TV set... Quote Link to comment Share on other sites More sharing options...
Loccy Posted January 18, 2007 Author Share Posted January 18, 2007 Good stuff. I shall have a stab at Schmutzpuppe's mod (or rather a mate of mine who knows what he's doing will) and if it doesn't work out, a session on ebay France might be in order. Thanks to all. Quote Link to comment Share on other sites More sharing options...
RoMNutz Posted January 19, 2007 Share Posted January 19, 2007 My Australian PAL 7800 Has a 2 way channel switch at the back. Switched one way the picture would not tune in properly. Switched the other way. PERECT picture. One strange thing though someone has taped the RF cable to the power supply cable. So the RF cable runs along the power cable. If I use just a standard RF cable I cannot tune the picture in properly. The picture will only tune in perfectly with the RF cable taped to the power cable and the with the channel switch, switched to the left. Hope this helps. But can someone explain why this is so. Thanks -RoMNutz- Quote Link to comment Share on other sites More sharing options...
Schmutzpuppe Posted January 22, 2007 Share Posted January 22, 2007 (edited) I made a new S-Video circuit for my NTSC device and I also tested it with the PAL one. All I had to do was to add a resistor and a diode (else the TIA produces too much distortion which didn't happen on NTSC). The circuit doesn't use irritating potentiometers and had a slightly better picture than the one I did before. I'll try to write down the circuit maybe it helps you to build your own one. Edited January 22, 2007 by Schmutzpuppe Quote Link to comment Share on other sites More sharing options...
mimo Posted February 21, 2007 Share Posted February 21, 2007 You can try this to start with. Mitch or buy a french 7800 with SCART ouptut, works great with PAL TV sets... Just got my french 7800, works a treat on my Pal TV, no mods to do to get rid of all the fuzz Quote Link to comment Share on other sites More sharing options...
ApolloBoy Posted February 21, 2007 Share Posted February 21, 2007 My Australian PAL 7800 Has a 2 way channel switch at the back. Switched one way the picture would not tune in properly. Switched the other way. PERECT picture. One strange thing though someone has taped the RF cable to the power supply cable. So the RF cable runs along the power cable. If I use just a standard RF cable I cannot tune the picture in properly. The picture will only tune in perfectly with the RF cable taped to the power cable and the with the channel switch, switched to the left. Hope this helps. But can someone explain why this is so. Thanks -RoMNutz- What does this have to do with a composite video mod? Quote Link to comment Share on other sites More sharing options...
Math You Posted March 4, 2007 Share Posted March 4, 2007 Does the 7800 use the same 4050 video buffer chip as the 2600 Jr? If it does, then you might get composite video without having to build a circuit. Quote Link to comment Share on other sites More sharing options...
ApolloBoy Posted March 4, 2007 Share Posted March 4, 2007 Does the 7800 use the same 4050 video buffer chip as the 2600 Jr? No, it doesn't. Quote Link to comment Share on other sites More sharing options...
Shawn Posted March 5, 2007 Share Posted March 5, 2007 My Australian PAL 7800 Has a 2 way channel switch at the back. Switched one way the picture would not tune in properly. Switched the other way. PERECT picture. One strange thing though someone has taped the RF cable to the power supply cable. So the RF cable runs along the power cable. If I use just a standard RF cable I cannot tune the picture in properly. The picture will only tune in perfectly with the RF cable taped to the power cable and the with the channel switch, switched to the left. Hope this helps. But can someone explain why this is so. Thanks -RoMNutz- That all make no sense at all. Your RF being taped to you AC would make no positive difference in performance AT ALL. If anything it might make the picture worse do to feeback. Quote Link to comment Share on other sites More sharing options...
pepax Posted May 11, 2007 Share Posted May 11, 2007 I made a new S-Video circuit for my NTSC device and I also tested it with the PAL one.All I had to do was to add a resistor and a diode (else the TIA produces too much distortion which didn't happen on NTSC). The circuit doesn't use irritating potentiometers and had a slightly better picture than the one I did before. I'll try to write down the circuit maybe it helps you to build your own one. So have you been successful in writing it down? Seriously, I believe I wouldn't be the only one really happy to see the result. (Also because I happen to have the PAL-I 7800 while having a PAL-DK/BG only TV = no sound. ) So, Schmutzpuppe, thank you in advance for publishing the schematics soon. Quote Link to comment Share on other sites More sharing options...
mimo Posted September 4, 2007 Share Posted September 4, 2007 I made a new S-Video circuit for my NTSC device and I also tested it with the PAL one.All I had to do was to add a resistor and a diode (else the TIA produces too much distortion which didn't happen on NTSC). The circuit doesn't use irritating potentiometers and had a slightly better picture than the one I did before. I'll try to write down the circuit maybe it helps you to build your own one. Any news on the schematics? Quote Link to comment Share on other sites More sharing options...
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