Adam 12 Posted December 14, 2019 Share Posted December 14, 2019 I have a 4 switch Vader that I would very much like to mod to have composite av output. However, every guide, and every video I've seen on how to do so involves destroying the RF Output functionality. Id like to keep this as well, as some of my TVs don't have RCA Jack's on them. Is this even remotely possible? What would happen, for instance, I I made the same connections, but didn't remove the RF Box? Any suggestions? If it simply isn't possible, I suppose I'll leave it factory, for the sake of increased compatibility. Every TV I have has a coax input... I can live with the noise if I have to... Any suggestions or insight is appreciated. I really don't know how these things work, and I'm interested in learning. 1 Quote Link to comment Share on other sites More sharing options...
Keatah Posted December 14, 2019 Share Posted December 14, 2019 It might bog down the video generation stuff in the TIA or similar. You could wire in a switch if simply doing the mod in parallel doesn't work. Switch between the mod and original RF. I seriously HATE those "mod guides" that tell you to cut up and destroy the existing RF stuff, parts, or traces. And then recommend you discard it as you won't ever want to go back. Fucking bullshit on that! You never want to do that. And you always ALWAYS want to mod in a such a way that you can go backwards with minimal fuss. Like desolder and remove and place in baggie the parts they tell you to cut out and mangle. You desolder the RF box, not cut it out.. Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted December 14, 2019 Share Posted December 14, 2019 It's definitely possible. Use an op-amp instead of the cheap amplifier that the mods always call for. The existing circuit won't even know it's there. 1 1 Quote Link to comment Share on other sites More sharing options...
Adam 12 Posted December 14, 2019 Author Share Posted December 14, 2019 Child of CV, thank you for your schematic and insight. If only I knew how to read it or what to do with it ... In any case, it gives me hope! Ketah, my sentiments exactly. I can't stand it when people just clip the box off and throw it away! 1 Quote Link to comment Share on other sites More sharing options...
keithbk Posted December 14, 2019 Share Posted December 14, 2019 1 hour ago, Adam 12 said: Child of CV, thank you for your schematic and insight. If only I knew how to read it or what to do with it ... In any case, it gives me hope! GND stands for "Ground." After that, I'm in over my head. Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted December 15, 2019 Share Posted December 15, 2019 Well, the concept has been proven before. But on the other hand, the modulated audio is also present in the video signal so maybe it's a bit more complicated. Also, you'd want a separate amplifier for the direct audio. So here's a board design that has both video and audio filters. Maybe I could assemble it and report on findings. Of course anyone else is welcome to be a guinea pig too. Audio in should be connected directly to TIA audio out. Maybe on the pull-up resistor there. Video in should be connected to the video input on the modulator. +5, gnd, and outputs should be self explanatory. Note that component values would need to be adjusted for PAL systems. AtariRF.zip Quote Link to comment Share on other sites More sharing options...
Adam 12 Posted December 17, 2019 Author Share Posted December 17, 2019 I'd be very interested to know how your experiments go! Quote Link to comment Share on other sites More sharing options...
+GoldLeader Posted December 17, 2019 Share Posted December 17, 2019 I have A/V Modded Systems and I have Never wanted to go back.* *But to each his own....I mean ...I tell people to keep all their old games in boxes, even if they have the ROMs...Some people don't understand why...Then they ask me why and Damnit! Then I have to think. Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted December 18, 2019 Share Posted December 18, 2019 Install something like a UAV board and leave RF alone - it’s totally independent. No need to cut any traces or remove any components, though you will still need to make arrangements to get the composite and/or S-video signals out of the system either with RCA jacks or a pigtail cable of some sort. The least obtrusive way is to pull the RF cable off the internal connector and just run your A/V pigtail out the back of the case through the gap used for the stock RF cable. Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted December 18, 2019 Share Posted December 18, 2019 4 hours ago, DrVenkman said: Install something like a UAV board and leave RF alone - it’s totally independent. No need to cut any traces or remove any components, though you will still need to make arrangements to get the composite and/or S-video signals out of the system either with RCA jacks or a pigtail cable of some sort. The least obtrusive way is to pull the RF cable off the internal connector and just run your A/V pigtail out the back of the case through the gap used for the stock RF cable. D'oh, I forgot about that one. For that matter, isn't there a sticky post somewhere that lists the various mods and their pros and cons? If not, shouldn't there be? Quick search didn't turn up anything obvious. Quote Link to comment Share on other sites More sharing options...
Adam 12 Posted December 19, 2019 Author Share Posted December 19, 2019 Someone on Facebook suggested this, but then said it only works on six switch models. In any case, could someone link me to more information about the UAV board? I've searched Google and YouTube and found nothing. Quote Link to comment Share on other sites More sharing options...
Adam 12 Posted December 19, 2019 Author Share Posted December 19, 2019 https://thebrewingacademy.com/products/tba-ultimate-atari-video-uav-board-for-atari-2600?_pos=4&_sid=a620f9464&_ss=r A solution has been acheived! I think... Sille me never thought of searching here for UAV until just a bit ago. I read through a few threads, and found lots of information and a link to purchase them! I'm still not ENTIRELY sure they work on 4 switchers. Or how to connects audio to it. But I can now research further! Thanks everyone!! Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted December 20, 2019 Share Posted December 20, 2019 On 12/19/2019 at 3:43 AM, Adam 12 said: https://thebrewingacademy.com/products/tba-ultimate-atari-video-uav-board-for-atari-2600?_pos=4&_sid=a620f9464&_ss=r A solution has been acheived! I think... Sille me never thought of searching here for UAV until just a bit ago. I read through a few threads, and found lots of information and a link to purchase them! I'm still not ENTIRELY sure they work on 4 switchers. Or how to connects audio to it. But I can now research further! Thanks everyone!! Trust me, it does. I have one in my daily-driver 4-switch Woody, which I installed about 18 months ago. There’s a lot of individual wires involved (much like installing into a 7800), but it works great. Quote Link to comment Share on other sites More sharing options...
FAMICOM_87 Posted October 17, 2023 Share Posted October 17, 2023 I also hate to remove the RF modulator of any console. Unfortunately do not know, how to mod 4 switch model without removing parts But there is a easy way on 6 switch and Jr to keep functional RF modulators and not removing anything from the board They have one IC hex inverter called CD4050BE . here are you the mod for Jr. it applies for the 6 switch too. Only have to find the best resistor volumes for NTSC and PAL https://www.console-corner.de/videomod.html here are my values for the NTSC ,also those for PAL do not apply on a jr with 128 integrated games, there they should be another ones. here you are some examples of my jr mods Quote Link to comment Share on other sites More sharing options...
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