Smokeless Joe Posted July 31, 2016 Share Posted July 31, 2016 (edited) I thought this needed it's own topic, since the thread for Bryan's wonderful UAV is getting kinda long. For Atari 400 sound, I know of only two circuits. The one from ANTIC April 1984: and Bryan's suggested mod, (slx created the diagram): Q1. Are there any others out there? I've breadboarded both and they both seem to work well, and about the same. Bryan's is a lot easier and more compact, at least with through-hole components; it has fewer and smaller parts than the ANTIC mod. The SIO sound is kinda quiet on both, though. For Byran's mod, I tried it without the 18K resistor and it didn't make any difference that I could tell. Q2. Any ideas for boosting the SIO sound? Q3. Any ideas what the 18K resistor is for? Protecting the MCP601 chip maybe? Thanks, -Joe Edited July 31, 2016 by Smokeless Joe Quote Link to comment Share on other sites More sharing options...
+orpheuswaking Posted July 31, 2016 Share Posted July 31, 2016 Here are the boards for the mod I will be selling, it's based on the design by Bryan and adds a couple of capacitors. I need to test it with a couple of different resistor values as we try and even out the audio vs the SIO tape volume. 1 Quote Link to comment Share on other sites More sharing options...
ACML Posted August 1, 2016 Share Posted August 1, 2016 Here are the boards for the mod I will be selling, it's based on the design by Bryan and adds a couple of capacitors. I need to test it with a couple of different resistor values as we try and even out the audio vs the SIO tape volume. Board.JPG Boards.JPG Nice. When will these be available? Once they're ready, I'll take two of them. Quote Link to comment Share on other sites More sharing options...
Smokeless Joe Posted August 1, 2016 Author Share Posted August 1, 2016 (edited) Seriously, those look pretty sweet. What's the recommended way to install/mount one? It looks like it'll be about the same size at the UAV itself. I'm guessing...? A = POKEY audio in B = SIO audio in G = ground V = +5 V O = audio out Edited August 1, 2016 by Smokeless Joe Quote Link to comment Share on other sites More sharing options...
+orpheuswaking Posted August 1, 2016 Share Posted August 1, 2016 Good guess It's smaller than uav I'll do a comparison pic later. Installation mounting is up to you Quote Link to comment Share on other sites More sharing options...
ACML Posted August 24, 2016 Share Posted August 24, 2016 Any update to this project? With the options out there for separate (S-video) boards for the 400/800, we really need an answer for pokey and cassette audio. This upgrade is very welcome to the 400 community. This in conjunction with the video upgrade allows removal of the RF cable and gets the 400 a little closer to big brother 800. Quote Link to comment Share on other sites More sharing options...
+orpheuswaking Posted August 24, 2016 Share Posted August 24, 2016 Still working on it. I have VCF Midwest coming up in September. Hoping to have the first few boards ready by then Quote Link to comment Share on other sites More sharing options...
Smokeless Joe Posted August 26, 2016 Author Share Posted August 26, 2016 The TK-II-STEREO board, once it's finished, and once the 400/800 version is made, might be a pretty sweet option. I really love the TK-II (sans stereo) on my 400, so I'm optimistic about the stereo version. Quote Link to comment Share on other sites More sharing options...
Smokeless Joe Posted August 26, 2016 Author Share Posted August 26, 2016 Of course, I still want one of orpheuswaking's boards. If they are available in time for VCF Midwest, does that mean you'll sell them there? Quote Link to comment Share on other sites More sharing options...
+orpheuswaking Posted August 26, 2016 Share Posted August 26, 2016 Not sure how the TKII will work with the audio over SIO. Right now it's picking everything from POKEY Quote Link to comment Share on other sites More sharing options...
+orpheuswaking Posted August 26, 2016 Share Posted August 26, 2016 Not sure if I will be selling there or not, not sure what the interest is. I might take a few just in case Quote Link to comment Share on other sites More sharing options...
Smokeless Joe Posted August 26, 2016 Author Share Posted August 26, 2016 Oop! I keep forgetting about SIO audio. I'm going to VCF Midwest, so if you're not selling them before then, I'd definitely buy one there. Quote Link to comment Share on other sites More sharing options...
+orpheuswaking Posted August 26, 2016 Share Posted August 26, 2016 Oop! I keep forgetting about SIO audio. I'm going to VCF Midwest, so if you're not selling them before then, I'd definitely buy one there. LOL that was the whole point of the board, if you don't care about it you can just pick off from the pokey and disregard any additional modification. Another reason I wasn't that sure how much interest there would be, a very niche issue on a single a8 machine. Quote Link to comment Share on other sites More sharing options...
Stormbringer Posted August 26, 2016 Share Posted August 26, 2016 I think I mentioned I wanted one as well, if not please put me on the list. Quote Link to comment Share on other sites More sharing options...
+orpheuswaking Posted August 26, 2016 Share Posted August 26, 2016 No lists, not yet... I'll start a thread when they are ready. I don't think we will have any issues. I have at least 20 boards that will be for sale. Quote Link to comment Share on other sites More sharing options...
+slx Posted August 26, 2016 Share Posted August 26, 2016 Still interested in 2 (just in case I am away at list time Quote Link to comment Share on other sites More sharing options...
+orpheuswaking Posted September 4, 2016 Share Posted September 4, 2016 I have 10 assembled units that I will be taking to VCF midwest. When I return I will post regarding orders via mail. 1 Quote Link to comment Share on other sites More sharing options...
+orpheuswaking Posted September 5, 2016 Share Posted September 5, 2016 1 Quote Link to comment Share on other sites More sharing options...
Smokeless Joe Posted September 5, 2016 Author Share Posted September 5, 2016 SO cool! Are you selling them at VCF Midwest? Will you be there both days? Quote Link to comment Share on other sites More sharing options...
+orpheuswaking Posted September 6, 2016 Share Posted September 6, 2016 I will have 10 on hand. Still trying to figure pricing Quote Link to comment Share on other sites More sharing options...
ACML Posted September 6, 2016 Share Posted September 6, 2016 I will have 10 on hand. Still trying to figure pricing When they become available, I'd like two please. Thanks for making this! Quote Link to comment Share on other sites More sharing options...
Marius Posted September 6, 2016 Share Posted September 6, 2016 Yeah! Count me in for two please! I now use a STEREO upgrade board to have Sound. It works, but it is not exactly what I want in my 400.... Thanks for creating this! Greetz Marius Quote Link to comment Share on other sites More sharing options...
Stormbringer Posted September 6, 2016 Share Posted September 6, 2016 hey, is that VCF in Elk Grove Village? I'm about 15mins away from there! Quote Link to comment Share on other sites More sharing options...
+orpheuswaking Posted September 6, 2016 Share Posted September 6, 2016 hey, is that VCF in Elk Grove Village? I'm about 15mins away from there! Sure is Quote Link to comment Share on other sites More sharing options...
Marius Posted September 7, 2016 Share Posted September 7, 2016 @orpheuswalking: Is there a way I can be sure that I will be able to actually buy the two ordered AV add-ons? I'm not that much around anymore, and I do not want to miss this boat. Looks like an awesome thing to install in my 400. So please let me know how I can finish the order. (And I can imagine more people would like to know this) Quote Link to comment Share on other sites More sharing options...
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