Bryan Posted October 12, 2016 Author Share Posted October 12, 2016 The resistors help reduce the influence of high frequency noise (the logic input capacitance causes a natural roll off, so you just pick a value that allows you to drive at the required speed - and you're right, it would prevent any overshoot effects). The extra benefit is that although HC can handle inputs about a half-volt outside the rails, it does have protection diodes. The resistors assure there won't be much current drawn if the main supply is 5.1V or so. The reason I run much of the circuit at 4.5V is that I needed to re-regulate the 5V down to another voltage for a clean local supply, and CMOS stuff works just fine over a wide range. I think I know how I'm going to proceed with a new Rev D prototype. Ever notice you frequently can't find that one perfect logic chip that does exactly what you want? Quote Link to comment Share on other sites More sharing options...
+mytek Posted October 13, 2016 Share Posted October 13, 2016 I think I know how I'm going to proceed with a new Rev D prototype. Ever notice you frequently can't find that one perfect logic chip that does exactly what you want? Yep tell me about it That is why you may have noticed me resorting to diode-resistor logic in some of my designs. But I guess that's what PAL's or GAL's were made for, although that gives you yet one more device that needs to be programmed (unfortunately). - Michael Quote Link to comment Share on other sites More sharing options...
Bryan Posted October 15, 2016 Author Share Posted October 15, 2016 I've got a new Rev D design. The trick is now to get my new proto boards in Costa Rica. This country is not set up for shipping convenience and the government has cracked down on the independent shippers who were skirting the system (right now there's about $1000 of stuff I sent that I'll probably never see). 2 Quote Link to comment Share on other sites More sharing options...
Bikerbob Posted October 27, 2016 Share Posted October 27, 2016 Any luck Bryan? We here in S.Ontario canada will need about 10.. so when that thread gets started.. James 1 Quote Link to comment Share on other sites More sharing options...
+mytek Posted October 29, 2016 Share Posted October 29, 2016 Any luck Bryan? We here in S.Ontario canada will need about 10.. so when that thread gets started.. James I'm also hoping that the new version is ready pretty soon. I would like to verify its compatibility with the V-gate project I am working on. Presently his first released version is doing fine, so unless something has drastically changed I would think the new version would also be OK, but better to find out in case I can make a change to accommodate the difference. So yes, I too will want to buy a couple of these when they are released. - Michael Quote Link to comment Share on other sites More sharing options...
Bryan Posted October 29, 2016 Author Share Posted October 29, 2016 Right now here's my schedule: I'm packing my things for a shipment back to the US and I'll be dealing with receiving that in early December. While in the US I plan to build a few new Rev D prototypes. If everything's okay then I'll get pricing for semi-assembled boards and start pre-orders again which will ship when I move back for good in Mar/Apr unless I make an earlier trip back for some reason. This means I'll do another direct sale and won't begin supplying to the AA store until after I've completed my move and have a shop set up again. 7 Quote Link to comment Share on other sites More sharing options...
+mytek Posted November 13, 2016 Share Posted November 13, 2016 Here's an accessory that can make life easier for those that want to hook their UAV output into a newer TV or Up-Converter that supports the standard S-Video Mini-Din connector. mDIN4-F-BO-V1A, Mini Din 4 Female connector S-video Breakout Board I have two on order - Michael 2 Quote Link to comment Share on other sites More sharing options...
+mytek Posted November 24, 2016 Share Posted November 24, 2016 (edited) Here's a pic of the S-Video Mini Din 4 breakout board (link) installed on an XEGS and connected to the UAV via two shielded cables (one for Luma and the other for Chroma). Header Connections Luma Shield (GND on UAV) Chroma Shield (GND on UAV) To UAV: Luma Out To UAV: Chroma Out Chassis GND (green wire soldered to RF shield motherboard grounding trace) Works great! - Michael EDIT: I mounted it with two 4-40 screws, nuts, and four #4 nylon washers (one set as spacers between the boards, and the other as an insulator on the top side of the breakout board). Edited November 24, 2016 by mytekcontrols 2 Quote Link to comment Share on other sites More sharing options...
Bryan Posted November 24, 2016 Author Share Posted November 24, 2016 (edited) Quick update, I've ordered the new protos and I'll be picking them up when I go back to the States in a week. Edited November 24, 2016 by Bryan 3 Quote Link to comment Share on other sites More sharing options...
Bikerbob Posted November 27, 2016 Share Posted November 27, 2016 Hey Bryan, I did your older simple video mod on a Hong Kong socketed 800xl and the results were not great. On the other hand I have done this on other 800xl machines and better results.Can I send you screen pics and maybe you can give me an idea how to improve it?I am doing this because I am waiting for your UAV.. and could not wait anymore.. lol Quote Link to comment Share on other sites More sharing options...
+slx Posted November 27, 2016 Share Posted November 27, 2016 I have the physical PCB boards and they are tiny, It will take three wires soldered from the motherboard and one wire for audio out. With the size of the board I determined it would be better to avoid a header so all wires will be soldered direct. The hardest part will be locating it and insulating it from the motherboard. Things got busy here recently and I am working to get some time to finish this up. (I'll put a picture up of the PCB later so you can see how small it is) Any news on the audio boards for the 400? Would greatly appreciate to be able to get them to get two 400s converted. Quote Link to comment Share on other sites More sharing options...
Bryan Posted December 2, 2016 Author Share Posted December 2, 2016 New boards are here!! When I get back to Costa Rica I'll get them built and tested and hopefully we'll be rolling soon! Hey Bryan, I did your older simple video mod on a Hong Kong socketed 800xl and the results were not great. On the other hand I have done this on other 800xl machines and better results.Can I send you screen pics and maybe you can give me an idea how to improve it?I am doing this because I am waiting for your UAV.. and could not wait anymore.. lol I'm pretty busy for the next couple weeks, but I'll try to help. Are the pictures posted in the other video upgrade thread? -Bry 3 Quote Link to comment Share on other sites More sharing options...
Smokeless Joe Posted December 2, 2016 Share Posted December 2, 2016 Any news on the audio boards for the 400? Would greatly appreciate to be able to get them to get two 400s converted. I got my 400 audio board from orpheuswaking and it works nicely. I think he had a bunch, so it might be worth it to message him. Quote Link to comment Share on other sites More sharing options...
+slx Posted December 2, 2016 Share Posted December 2, 2016 Thanks. I thought he initially offered them at a show only. I have PM'ed him. Quote Link to comment Share on other sites More sharing options...
Bikerbob Posted December 2, 2016 Share Posted December 2, 2016 Ahhhh well if you have boards, then I will live with the output for now! .. getting close!! James Quote Link to comment Share on other sites More sharing options...
Sugarland Posted December 9, 2016 Share Posted December 9, 2016 Hi! I'm interested in at least one, please. Depending on supply and availability I will probably want more than one (three max). Thank you for making these! Quote Link to comment Share on other sites More sharing options...
+mytek Posted December 9, 2016 Share Posted December 9, 2016 When these get into the AtariAge Store I'll definitely be buying at least 4 of them. - Michael Quote Link to comment Share on other sites More sharing options...
Sandor / HARD Posted December 16, 2016 Share Posted December 16, 2016 Hello,This looks like a very nice piece of upgrade that preserves the retro feel of the picture.I got myself a 130 XE (PAL) recently. (only interested in 64K of it though )Is it possible for me to get this mod for it?I'd really appreciate a PM with the details.Thank you. Quote Link to comment Share on other sites More sharing options...
Bryan Posted December 18, 2016 Author Share Posted December 18, 2016 My subscription had lapsed so I was unable to receive PM's for a bit. I'm assembling some new boards and I'll be working on getting a price for partial assembly (now that one side has 0603 stuff on it, it's near the limit of what I can do by hand). Anyway, this might make the price a little higher but hopefully in the same ballpark. If everything looks good, I'll start a Rev D thread and take orders again. -Bry 7 Quote Link to comment Share on other sites More sharing options...
Bryan Posted December 20, 2016 Author Share Posted December 20, 2016 I'm almost done testing the new boards. After I found a couple mistakes and fixed a cracked board in my test monitor (it got manhandled on its way to Costa Rica.. see pic for the rather time consuming repair!) things started looking very nice. I'm just tweaking a few component values at this point. 6 Quote Link to comment Share on other sites More sharing options...
JoSch Posted December 20, 2016 Share Posted December 20, 2016 (edited) .. fixed a cracked board in my test monitor (it got manhandled on its way to Costa Rica.. see pic for the rather time consuming repair!) .. Edited December 20, 2016 by JoSch Quote Link to comment Share on other sites More sharing options...
Bryan Posted December 20, 2016 Author Share Posted December 20, 2016 Yeah, I hate Phenolic PCB's as they're very brittle- especially when they're supporting something heavy like a flyback transformer. Both edges of the board had cracks but the break through all those little traces was especially painful. Quote Link to comment Share on other sites More sharing options...
+remowilliams Posted December 20, 2016 Share Posted December 20, 2016 Oh man that hurts just looking at it... Quote Link to comment Share on other sites More sharing options...
+mytek Posted December 20, 2016 Share Posted December 20, 2016 I tried to do the same thing on a broken up Sony PAL/NTSC/RGB studio monitor, but unfortunately didn't succeed at getting it to work. Congrats on your success and diligence - Michael 1 Quote Link to comment Share on other sites More sharing options...
+MrFish Posted December 20, 2016 Share Posted December 20, 2016 (edited) I'm almost done testing the new boards. After I found a couple mistakes and fixed a cracked board in my test monitor (it got manhandled on its way to Costa Rica.. see pic for the rather time consuming repair!) things started looking very nice. I'm just tweaking a few component values at this point. Reminds me of a repair I did, a little less than two years ago, on a moisture-stricken dishwasher PCB. Close to the same amount of trace connections, and a series of connections on several ribbon cables. The repair was a success; no pictures, though, as it's on my sister's dishwasher. Edited December 20, 2016 by MrFish 2 Quote Link to comment Share on other sites More sharing options...
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