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diff --git a/blog/post/2024-02-04.html b/blog/post/2024-02-04.html deleted file mode 100644 index 6c2fcae..0000000 --- a/blog/post/2024-02-04.html +++ /dev/null @@ -1,600 +0,0 @@ -<!DOCTYPE html><html><head> -<meta charset="utf-8"> -<meta name="viewport" content="width=device-width,initial-scale=1"> -<meta name="theme-color" content="#000000"> -<title>Chrisoft::Blog(r#"RBUS-ADAT devlog")</title> -<meta name="description" content="«RBUS-ADAT devlog» de spelunca ursae"> -<meta name="author" content="Chris Xiong"> -<script type="text/javascript" src="/panel.js"></script> -<script type="text/javascript" src="/themer.js"></script> -<script type="text/javascript" src="/blog/footnoter.js"></script> -<script type="text/javascript" src="/blog/aes-js.js"></script> -<script type="text/javascript" src="/blog/scrypt.js"></script> -<script type="text/javascript" src="/blog/sha256.js"></script> -<script type="text/javascript" src="/blog/decryptor.js"></script> -<link rel="stylesheet" type="text/css" href="/common.css"> -<link rel="stylesheet" type="text/css" href="/panel.css"> -<link rel="stylesheet" type="text/css" href="/theme0a.css" id="theme0a"> -<link rel="stylesheet" type="text/css" href="/theme0b.css" id="theme0b"> -<link rel="stylesheet" type="text/css" href="/theme1a.css" id="theme1a"> -<link rel="stylesheet" type="text/css" href="/theme1b.css" id="theme1b"> -<link rel="stylesheet" type="text/css" href="/theme2a.css" id="theme2a"> -<link rel="stylesheet" type="text/css" href="/theme2b.css" id="theme2b"> -<link rel="stylesheet" type="text/css" href="/theme3a.css" id="theme3a"> -<link rel="stylesheet" type="text/css" href="/theme3b.css" id="theme3b"> -<link rel="stylesheet" type="text/css" href="/blog/blogext.css"> -<script> -function ol() -{ - window.onresize=function() - { - if(window.innerWidth<768) - setupevents(); - else unsetevents(); - } - window.onresize(); - loadTheme(); - _decryptonload(); -} -</script> -</head> -<body onload="ol()" style="overflow-x:hidden;"> - <div id="panel" class="TText"> - <ul id="panellist"> - <li><a href="/"><h1>Chrisoft</h1></a></li> - <li><a href="/blog"><h2>Blog</h2></a></li> - <li><a href="#"><h3 id="title">RBUS-ADAT devlog</h3></a></li> - <li><span>Tags</span> - <ul id="tagslist"> - <li><a href="/blog/list/music/">music</a></li><li><a href="/blog/list/electronics/">electronics</a></li></ul> - </li> - <li id="tocouter"> - <span>Table of Contents</span> - <ul id="tocroot"> - <li><a class="toctarg" href="#tocanch0">Origins</a></li><li><a class="toctarg" href="#tocanch1">Background check on the chip</a></li><li><a class="toctarg" href="#tocanch2">Ill-fated commencement</a></li><li><a class="toctarg" href="#tocanch3">Designing the board</a></li><li><a class="toctarg" href="#tocanch4">Board production and final -assembly</a></li><li><a class="toctarg" href="#tocanch5">Full project timeline</a></li><li><a class="toctarg" href="#tocanch6">Full material cost</a></li><li><a class="toctarg" href="#tocanch7">Potential future work</a></li><li><a class="toctarg" href="#tocanch8">I want one! What should I do?</a></li><li><a class="toctarg" href="#tocanch9">You’re an idiot and -your design is trash!</a></li><li><a class="toctarg" href="#tocanch10">Acknowledgment</a></li></ul> - </li> - <li style="margin-left:-0.5em"><a id="prevp" href="2024-02-02.html">Prev post</a></li> - <li style="margin-left:-0.5em"><a id="nextp" href="2024-02-29.html">Next post</a></li> - </ul> - </div> - <div id="content"> - <h2 id="titleh" class="TText" style="font-wight:normal;">RBUS-ADAT devlog</h2> - <div id="datetags" class="TText" style="margin-bottom:1em;">2024-02-04<br>#music #electronics</div> - <hr><div id="article" class="TText"><article> -<h2 id="tocanch0" class="tvis">Origins</h2> -<p>Funny enough, the origins of this project has nothing to do with -R-BUS <strong>or</strong> ADAT.</p> -<p>Ideas to build a digital only version of the EDIROL SD-80 surfaced in -early 2023 as an extension to my SD-80 modding plan. Beacuse my SD-80 is -half broken (headphone amp on analog output 1 fried due to my stupidity, -see my <a href="https://chrisoft.org/blog/post/2020-11-20.html#tocanch2">second -SD-80 post</a> for how it happened) and I only ever record it through -its digital outputs anyway, I believe I can drastically reduce the -footprint of it by taking out all the analog outputs and removing the -now unused ±15V rail, making the device USB bus powered at the same -time. There was also plans to add a second digital output to the modded -SD-80, however the plan was never finalized, let alone implemented -because of my lack of proper electronics knowledge and soldering skills. -The idea was therefore shelved.</p> -<p>Meanwhile in early 2022, I acquired a Roland XV-5080 (which I still -have a long overdue review to write). I was also only recording that -thing digitally and sometimes felt that wasting the other 3 stereo -outputs is a shame. I did a bit of research and apparently the R-BUS -port on its back outputs all 4 stereo outputs of the synth. Later I -found out there was the DIF-AT and DIF-AT24 that can convert R-BUS to -ADAT which is still fairly common on modern audio interfaces. However -for a small box that doesn’t really do much, asking price for the DIF-AT -is absolutely crazy – every single listing I saw was ~$200. And the -DIF-AT24, which supports 24-bit ADAT output (in contrast to DIF-AT’s -20-bit output), is pretty much unobtainium. So I decided to live with -recording through its S/PDIF output for the time being.</p> -<p>In September 2023, by pure coincidence, I found a listing on ebay of -a chip described as “ADAT optical encoder/generator”, which was the <a href="https://www.coolaudio.com/docs/COOLAUDIO_V1401_DATASHEET.pdf">coolaudio -V1401</a> that later would become the heart of my design. After reading -its datasheet I decided it would pretty much make my SD-80 digital mod -trivial, with the added benefit of carrying both stereo output channels -on a single port. So I opened up the service manual for SD-80 and -started to study which pin each signal should go to. However I quickly -realized that performing the mod would require soldering around the XV -chip inside the SD-80, which is still a thing that I’m not really -willing to do; and that I could easily test out my theory on XV-5080’s -R-BUS port because the digital audio output pins on XV-5080’s R-BUS port -is pretty much directly connected to the XV chip through an -inverter.</p> -<p>To summerize … I came up with a solution for a problem that I made up -for myself.</p> -<h2 id="tocanch1" class="tvis">Background check on the chip</h2> -<p>The seller of the chip claims the chip is an equivalent of the AL1401 -from Alesis, which sounds quite interesting as Alesis is actually the -company behind ADAT (<u>Alesis</u> Digital Audio Tape, as for why it’s a -tape not a optical interface… that’s a story for another time). -Suspicion that this chip is a Chinese clone arose. So I did a bit of -background on the company … <a id="n1" href="#note1" class="note">[1]</a></p> -<p>Turns out, of course it is. While its roots can be traced to the US -in the 90s, design team of coolaudio is now located in China -<a id="n2" href="#note2" class="note">[2]</a>. Better still, it’s a brand -of Music Tribe, which is Uli Behringer’s company. Yes it’s the same -person who founded Behringer which is best known as the legal (/s) clone -audio equipment manufacturer. <del>No wonder why coolaudio’s product -portfolio is all clone chips.</del></p> -<p>Well, the original AL1401 is pretty much impossible to find nowadays, -so I really have no choice don’t I?</p> -<h2 id="tocanch2" class="tvis">Ill-fated commencement</h2> -<p>I ordered the V1401 chips before my end-of-year vacation travel. When -I returned from my vacation, I found these in my mail box:</p> -<div style="text-align:center;"> -<a href="//filestorage.chrisoft.org/blog/img/rbdt-pk.jpg"><img style="width: 50%;" src="//filestorage.chrisoft.org/blog/img/ssbsthumb_1024x1024_rbdt-pk.jpg"></a><br>Suspicious packets -</div> -<p>which may look suspicious to law enforcement… but they are actually -just chips. Not the edible kind.</p> -<p>My prior experience with electronics is only limited to reading -schematics and disassembling (and destroying in the process) hundreds of -home appliances. So I guess I have seen hundreds of printed circuit -boards but I haven’t ever made or designed one of my own. I did take a -class during my undergrad that involved programming FPGAs, which did -have a “drawing schematics on a computer” component to it, but that -didn’t have anything to do with PCB design.</p> -<p>Since I do not have any prior experience working with EDA software, I -toyed with an Chinese online EDA toolkit that literally has “easy” in -its name (EasyEDA) and drew a tentative schematic for the supporting -components. Apparently it wasn’t that different from what I used when I -was taking the FPGA class, but at this stage I still haven’t confirmed -many aspects of the characteristics of R-BUS yet. As a result there were -a multitude of issues with this schematic. However it did help me come -up with a list of components (“bill of materials” in more professional -terms) needed for the project. I ordered these together with some -prototyping supplies online, hoping to actually build a prototype once -they have arrived.</p> -<div style="text-align:center;"> -<a href="//filestorage.chrisoft.org/blog/img/rbdt-es.png"><img style="width: 50%;" src="//filestorage.chrisoft.org/blog/img/ssbsthumb_1024x1024_rbdt-es.png"></a> <br>The error-riddled -schematic -</div> -<p>I need an audio interface with ADAT inputs because none of the bunch -I already own has one. Since the Scarlett 18i8 3rd gen was on sale for -$360 at the time, I decided to get one.</p> -<p>When I was reviewing the datasheet for the components I ordered -<a id="n3" href="#note3" class="note">[3]</a>, I -found out that I’ve ordered the wrong optical transmitter. The part I -ordered was TOTX1353 which only supports up to 500 kb/s data rate … less -than 1/20 required by an ADAT data stream. However for some stupid -reason that I couldn’t recall, I decided to try prototyping with it -anyway.</p> -<p>I soldered one of the V1401 chips to the SOIC carrier board. As this -time I used plenty of proper, good quality flux as suggested the MacBook -repair guy Louis Rossmann <a id="n4" href="#note4" class="note">[4]</a>, the result didn’t look -nearly as bad as my previous SMD soldering attempts and I was quite -happy with it.</p> -<p>On the following day I started showing mild symptoms of a common -cold. Later that night a fever kicked in. The next day I decided to use -an expired Cornweed <a id="n5" href="#note5" class="note">[5]</a> test kit on myself and found out Cornweed was -growing inside me (hence the name of this subsection).</p> -<p>I got a week off from my workplace to get rid of the Cornweed. Since -I already felt much better after one day, I started breadboarding. It -was finished pretty quickly. But soon after that I found out there was -more than one thing wrong with the optical transmitter module I chose – -the module doesn’t have a drive circuitry built in and it pretty much -just a bare LED. There is no way in hell that it can be directly driven -from the output of a 74LS04. The LED in the transmitter only barely -lights up when the output is active. At this point I finally realized -that I can’t use this out of spec piece of crap in the final design -anyway, so I placed order for a few transmitters that are more fit for -the job.</p> -<table> -<tbody><tr> -<td> -<div style="text-align:center;max-width:98%;"> -<a href="//filestorage.chrisoft.org/blog/img/rbdt-bo.jpg"><img style="width: 50%;" src="//filestorage.chrisoft.org/blog/img/ssbsthumb_1024x1024_rbdt-bo.jpg"></a> <br>The chip on its -breakout board -</div> -</td> -<td> -<div style="text-align:center;max-width:98%;"> -<a href="//filestorage.chrisoft.org/blog/img/rbdt-b0.jpg"><img style="width: 50%;" src="//filestorage.chrisoft.org/blog/img/ssbsthumb_1024x1024_rbdt-b0.jpg"></a> <br>The breadboard -prototype before it was working -</div> -</td> -</tr> -</tbody></table> -<p>When I was trying to wire in the DB-25 terminal block, I found out -that I don’t have the proper flathead driver for the screws. So I had to -get one of those as well.</p> -<p>Once I really had all the items I need, I started putting things -together. The process was fairly easy but the audio interface didn’t see -the ADAT signal on the first attempt. I double checked all the -breadboard connections and inputs to the chip, which appeared to be all -correct. Feeling tired, I removed the prototype from my desk to work on -it the following day, unplugging all the cables in the process.</p> -<p>To my utter surprise, the thing straight up worked when I plugged it -in on the next day. It turns out that the port on the new transmitter is -very tight and takes quite a bit of force to insert the plug all the way -in.</p> -<div style="text-align:center;"> -<a href="//filestorage.chrisoft.org/blog/img/rbdt-b1.jpg"><img style="width: 50%;" src="//filestorage.chrisoft.org/blog/img/ssbsthumb_1024x1024_rbdt-b1.jpg"></a><br>Working prototype! -</div> -<h2 id="tocanch3" class="tvis">Designing the board</h2> -<p>I decided to switch to KiCad soon after I started the actual -prototyping process, probably due to my bias towards free software.</p> -<p>Drawing the schematics wasn’t hard. Although I did have to read the -manuals to find out how buses work in KiCad.</p> -<p>There is no symbol for the V1401 chip in KiCad’s default library, and -no symbol or footprint for the optical transmitter. I had to learn how -to draw these and make them myself. Fortunately the process is pretty -straightforward and the datasheet has everything I need.</p> -<p>I spent some additional time studying the digital / analog audio -output section of XV-5080 to find out the format of digital audio data -coming out of the XV chip. Once that was done I was able finalize the -schematic. I started learning routing in KiCad soon after that. However -that effort was put on hold as soon as I realized I should really -validate the schematic on breadboard first.</p> -<p>Once I got the breadboard version working, I started working on -routing the board again. It started pretty difficult, as certain -crossings couldn’t really be avoided. However once I started making -liberal use of vias the problems got solved pretty quickly. I then -recalled seeing large ground plane on most circuit boards that I’ve laid -my eyes on and found out those can be made in KiCad with “zones”. -However for some (not completely insane, but still pretty stupid) reason -I thought adding too much copper could add to the manufacturing cost, so -I was … quite stingy with the zones. Maybe I should fix it in the next -revision.</p> -<p>Finally I added some personal markings on the board. I decided to try -the svg import feature of KiCad and drew something in Inkscape within a -minute. Once placed on the board it actually looked pretty nice. Yes it -is a Touhou reference, now stop asking why.</p> -<table> -<tbody><tr> -<td> -<div style="text-align:center;max-width:98%;"> -<a href="//filestorage.chrisoft.org/blog/img/rbdt-ks.png"><img style="width: 50%;" src="//filestorage.chrisoft.org/blog/img/ssbsthumb_1024x1024_rbdt-ks.png"></a> <br>Unfinished -schematic in KiCad -</div> -</td> -<td> -<div style="text-align:center;max-width:98%;"> -<a href="//filestorage.chrisoft.org/blog/img/rbdt-rt.png"><img style="width: 50%;" src="//filestorage.chrisoft.org/blog/img/ssbsthumb_1024x1024_rbdt-rt.png"></a> <br>First attempt at -routing. The board was laid out very differently. -</div> -</td> -</tr> -</tbody></table> -<h2 id="tocanch4" class="tvis">Board production and final -assembly</h2> -<p>The design was now ready and I started looking for PCB manufacturers. -I settled between a few Chinese manufacturing providers for price -considerations. My final manufacturer of choice was JLCPCB, mostly -because they have the best reviews in China. I submitted the files and -waited anxiously for the boards to arrive.</p> -<p>The boards arrived astonishingly fast. In just 5 days it went through -the entire production sequence as well as the Pacific Ocean, and arrived -at my door steps. I test fit all the components, which all fit just -fine. Next was the final assembly which also went pretty smoothly. After -a quick test the board was found to work perfectly. I was actually -shocked that the very first PCB designed by me worked first try. To be -fair the board itself is pretty simple. It was figuring out the R-BUS -protocol that made the project slightly tricky. Actually I’m pretty -surprised to find out that nobody has done the work already given the -service manual of XV-5080 has been floating around on the Internet for -many years now. Anyway, this has been a fantastic starter electronics -project for me and the process has been quite enjoyable.</p> -<table> -<tbody><tr> -<td> -<div style="text-align:center;max-width:98%;"> -<a href="//filestorage.chrisoft.org/blog/img/rbdt-pp.jpg"><img style="width: 50%;" src="//filestorage.chrisoft.org/blog/img/ssbsthumb_1024x1024_rbdt-pp.jpg"></a> <br>Box from JLCPCB -</div> -</td> -<td> -<div style="text-align:center;max-width:98%;"> -<a href="//filestorage.chrisoft.org/blog/img/rbdt-bs.jpg"><img style="width: 50%;" src="//filestorage.chrisoft.org/blog/img/ssbsthumb_1024x1024_rbdt-bs.jpg"></a> <br>It’s between my -fingers… -</div> -</td> -</tr> -<tr> -<td> -<div style="text-align:center;max-width:98%;"> -<a href="//filestorage.chrisoft.org/blog/img/rbdt-pa.jpg"><img style="width: 50%;" src="//filestorage.chrisoft.org/blog/img/ssbsthumb_1024x1024_rbdt-pa.jpg"></a> <br>First two -components installed -</div> -</td> -<td> -<div style="text-align:center;max-width:98%;"> -<a href="//filestorage.chrisoft.org/blog/img/rbdt-fp.jpg"><img style="width: 50%;" src="//filestorage.chrisoft.org/blog/img/ssbsthumb_1024x1024_rbdt-fp.jpg"></a> <br>Assembly finished -</div> -</td> -</tr> -</tbody></table> -<div style="text-align:center;"> -<a href="//filestorage.chrisoft.org/blog/img/rbdt-pw.jpg"><img style="width: 50%;" src="//filestorage.chrisoft.org/blog/img/ssbsthumb_1024x1024_rbdt-pw.jpg"></a><br>IT’S ALIVE!! -</div> -<h2 id="tocanch5" class="tvis">Full project timeline</h2> -<ul> -<li>2023-09-27: V1401 chip found on ebay.</li> -<li>2023-12-09: V1401 chips bought from ebay seller.</li> -<li>2024-01-10: Schematic attempt with EasyEDA.</li> -<li>2024-01-11: First batch of components ordered.</li> -<li>2024-01-17: V1401 soldered to breadboard adapter.</li> -<li>2024-01-18: Second batch of components ordered.</li> -<li>2024-01-20: Switched to KiCad. Schematic finished except missing -symbol and footprint for optical transmitter.</li> -<li>2024-01-21: Breadboard built. Created symbols and footprint for -optical transmitter in KiCad.</li> -<li>2024-01-22: Started learning PCB layout in KiCad. First attempt to -route the PCB made. Routing halted later that day.</li> -<li>2024-01-26: First working breadboard prototype. Routing resumed and -finished the same day. Learned how to use zones in KiCad. PCB design -revised.</li> -<li>2024-01-27: PCB submitted to JLCPCB for production. 10 boards -ordered.</li> -<li>2024-02-01: PCB arrived. First board assembled and passed -testing.</li> -</ul> -<h2 id="tocanch6" class="tvis">Full material cost</h2> -<p>This includes all orders placed specifically for this project, -including stuff that can be later used for other purposes. Prices listed -before VAT.</p> -<table> -<colgroup> -<col style="width: 25%"> -<col style="width: 10%"> -<col style="width: 25%"> -<col style="width: 39%"> -</colgroup> -<thead> -<tr class="header"> -<th style="text-align: left;">Item</th> -<th style="text-align: center;">Qty</th> -<th style="text-align: center;">Vendor</th> -<th style="text-align: center;">Price Total</th> -</tr> -</thead> -<tbody> -<tr class="odd"> -<td style="text-align: left;">Half-size breadboard</td> -<td style="text-align: center;">5</td> -<td style="text-align: center;">Adafruit</td> -<td style="text-align: center;">25.00</td> -</tr> -<tr class="even"> -<td style="text-align: left;">Breadboarding wire bundle</td> -<td style="text-align: center;">2</td> -<td style="text-align: center;">Adafruit</td> -<td style="text-align: center;">9.90</td> -</tr> -<tr class="odd"> -<td style="text-align: left;">Adafruit Perma-Proto Super Pack</td> -<td style="text-align: center;">1</td> -<td style="text-align: center;">Adafruit</td> -<td style="text-align: center;">34.95</td> -</tr> -<tr class="even"> -<td style="text-align: left;">Hook-up Wire Spool Set - 22AWG Solid Core -- 6 x 25 ft</td> -<td style="text-align: center;">1</td> -<td style="text-align: center;">Adafruit</td> -<td style="text-align: center;">15.95</td> -</tr> -<tr class="odd"> -<td style="text-align: left;">Hakko Professional Quality 20-30 AWG Wire -Strippers</td> -<td style="text-align: center;">1</td> -<td style="text-align: center;">Adafruit</td> -<td style="text-align: center;">17.50</td> -</tr> -<tr class="even"> -<td style="text-align: left;">SOIC-20 breakout 3 Pack</td> -<td style="text-align: center;">2</td> -<td style="text-align: center;">Adafruit</td> -<td style="text-align: center;">9.00</td> -</tr> -<tr class="odd"> -<td style="text-align: left;">Adafruit Parts Pal</td> -<td style="text-align: center;">1</td> -<td style="text-align: center;">Adafruit</td> -<td style="text-align: center;">19.95</td> -</tr> -<tr class="even"> -<td style="text-align: left;">TOTX1353(F)</td> -<td style="text-align: center;">10</td> -<td style="text-align: center;">DigiKey</td> -<td style="text-align: center;">92.88</td> -</tr> -<tr class="odd"> -<td style="text-align: left;">16SEPC100M+TSS</td> -<td style="text-align: center;">20</td> -<td style="text-align: center;">DigiKey</td> -<td style="text-align: center;">11.56</td> -</tr> -<tr class="even"> -<td style="text-align: left;">SN74LS04N</td> -<td style="text-align: center;">25</td> -<td style="text-align: center;">DigiKey</td> -<td style="text-align: center;">19.30</td> -</tr> -<tr class="odd"> -<td style="text-align: left;">CTS 208-4</td> -<td style="text-align: center;">10</td> -<td style="text-align: center;">DigiKey</td> -<td style="text-align: center;">5.76</td> -</tr> -<tr class="even"> -<td style="text-align: left;">DB25-SL-25</td> -<td style="text-align: center;">10</td> -<td style="text-align: center;">DigiKey</td> -<td style="text-align: center;">12.60</td> -</tr> -<tr class="odd"> -<td style="text-align: left;">CFR-25JB-52-1K</td> -<td style="text-align: center;">100</td> -<td style="text-align: center;">DigiKey</td> -<td style="text-align: center;">2.47</td> -</tr> -<tr class="even"> -<td style="text-align: left;">CFR25SJT-52-2K2</td> -<td style="text-align: center;">100</td> -<td style="text-align: center;">DigiKey</td> -<td style="text-align: center;">2.47</td> -</tr> -<tr class="odd"> -<td style="text-align: left;">1N4002B-G</td> -<td style="text-align: center;">30</td> -<td style="text-align: center;">DigiKey</td> -<td style="text-align: center;">4.32</td> -</tr> -<tr class="even"> -<td style="text-align: left;">25SEP10M+TSS</td> -<td style="text-align: center;">20</td> -<td style="text-align: center;">DigiKey</td> -<td style="text-align: center;">18.84</td> -</tr> -<tr class="odd"> -<td style="text-align: left;">C320C104K5R5TA</td> -<td style="text-align: center;">50</td> -<td style="text-align: center;">DigiKey</td> -<td style="text-align: center;">5.05</td> -</tr> -<tr class="even"> -<td style="text-align: left;">FCR684208T</td> -<td style="text-align: center;">10</td> -<td style="text-align: center;">DigiKey</td> -<td style="text-align: center;">33.75</td> -</tr> -<tr class="odd"> -<td style="text-align: left;">V1401</td> -<td style="text-align: center;">10</td> -<td style="text-align: center;">ebay (av13)</td> -<td style="text-align: center;">30.00</td> -</tr> -<tr class="even"> -<td style="text-align: left;">JUXINICE DB25 Male to Male Cable 3 feet, -26awg Tinned Copper Wires,Double-Shielded with Foil &Metal Braid, -D-SUB 25 pin Cable RS232 Serial Cable in Black</td> -<td style="text-align: center;">1</td> -<td style="text-align: center;">Amazon</td> -<td style="text-align: center;">12.99</td> -</tr> -<tr class="odd"> -<td style="text-align: left;">Antrader 2PCS DB25 Breakout Connector -D-sub 25-pin Female Adapter RS232 to Terminal Board Signal Module</td> -<td style="text-align: center;">1</td> -<td style="text-align: center;">Amazon</td> -<td style="text-align: center;">11.99</td> -</tr> -<tr class="even"> -<td style="text-align: left;">Focusrite Scarlett 18i8 3rd Gen USB Audio -Interface</td> -<td style="text-align: center;">1</td> -<td style="text-align: center;">Sweetwater</td> -<td style="text-align: center;">359.99</td> -</tr> -<tr class="odd"> -<td style="text-align: left;">Mako Driver Kit - 64 Precision Bits</td> -<td style="text-align: center;">1</td> -<td style="text-align: center;">iFixit</td> -<td style="text-align: center;">39.95</td> -</tr> -<tr class="even"> -<td style="text-align: left;">PCB Production</td> -<td style="text-align: center;">10</td> -<td style="text-align: center;">JLCPCB</td> -<td style="text-align: center;">14.50</td> -</tr> -</tbody> -</table> -<p>Grand Total = $810.67</p> -<h2 id="tocanch7" class="tvis">Potential future work</h2> -<p><del>First of all I need to fix the stingy ground plane.</del></p> -<p>V1401’s datasheet isn’t very clear on whether it can generate a -24-bit ADAT stream. Recordings made with the Scarlett 18i8 seem to have -the full 24-bit resolution, but that could be due to interpolation done -by the audio interface or operating system. Testing this requires an -oscilloscope which I currently don’t have.</p> -<p>It is highly feasible to implement an ADAT encoder / decoder in -software on cheap microcontrollers like the rp2040. The ADAT protocol is -documented <a href="https://ackspace.nl/wiki/ADAT_project">here</a> and -seems fairly straightforward to implement. This also has the added -benefit of making sure that 24-bit ADAT is really supported. However -this will also more than likely require an oscilloscope for debugging. -I’ll also have to learn rp2040’s PIO programming and theories on PLL -operation, both from scratch.</p> -<p>Exposing the MIDI interface on R-BUS also seems possible. However it -seems that XV-5080 doesn’t make use of the MIDI interface on R-BUS -<a id="n6" href="#note6" class="note">[6]</a>.</p> -<p><del>Maybe I’ll add more Touhou references to the silkscreen, who -knows.</del></p> -<h2 id="tocanch8" class="tvis">I want one! What should I do?</h2> -<p>First of all I’d suggest giving the <a href="https://filestorage.chrisoft.org/blog/data/rbus_adat_m.pdf">manual</a> -a read to make sure this board really does what you want.</p> -<p>If you have made up your mind to get a board, I have some bad news -for you. Unfortunately right now there’s no straightforward way obtain -this board. Mainly because I have never sold anything online. Also this -board is bound to be a very niche product, and possibly can’t even -recover the development costs if I decided to sell them. Those are the -reasons why I currently have no plans to sell the board.</p> -<p>So right now your options are:</p> -<ul> -<li>Build the board yourself. The design is fully open source and build -instruction is included in the manual. If you are comfortable with -electronics DIY projects, this is probably your best bet.</li> -<li>Let me know you want one! Right now I still have a few -pre-production boards lying around. As long as you’re willing to cover -the terrible USPS shipping rates I’m willing to assemble a board and -send it your way. Of course you’re welcome to pay a little bit more… but -any excess for now will be treated as donations (a “pay what you think -it’s worth” model) – as I don’t have pricing fixed yet. Also if enough -people have expressed interest in the board I might actually start -selling them…</li> -</ul> -<h2 id="tocanch9" class="tvis">You’re an idiot and -your design is trash!</h2> -<p>First of all, thank you. I am indeed a massive idiot.</p> -<p>If you have suggestions on how this board could be improved, please -consider sending them to me. As a beginner in electronics design I can -definitely use any piece of advice coming from pretty much anyone in -this field. Any constructive suggestion will be greatly appreciated.</p> -<p>Of course other types of contributions will also be appreciated. For -example this board currently lacks any kind of enclosure as I have zero -idea how to create 3D models for real-life object manufacturing. Help in -this space is desperately needed.</p> -<h2 id="tocanch10" class="tvis">Acknowledgment</h2> -<p>I’d like to thank <a href="https://www.youtube.com/@KRPalto47">Palto</a> for being extremely -supportive towards this project, including putting up with my endless -DMs on Discord.</p> -</article> -</div><br><hr> - <div class="TText" id="notediv" style="font-size:80%;"><span class="TText"><a id="note1" href="#n1">[1]</a>: Not to shit on the country or -anything, after all I’m from said country … but Chinese clone chips are -notorious for being unreliable in general or straight up not -working.<br></span><span class="TText"><a id="note2" href="#n2">[2]</a>: <a href="https://www.coolaudio.com/aboutus-page.php">“World -Class Management &Technical Team: One of the most extensive design -service companies in China”</a><br></span><span class="TText"><a id="note3" href="#n3">[3]</a>: which is probably a dumb thing to do. I should have read -through all of them <em>before</em> placing the order.<br></span><span class="TText"><a id="note4" href="#n4">[4]</a>: He doesn’t really do the repairs -himself nowadays any more, does he?<br></span><span class="TText"><a id="note5" href="#n5">[5]</a>: That thing which destroyed 2020 to 2022 -for countless people misspelled deliberately to avoid unwanted -attention.<br></span><span class="TText"><a id="note6" href="#n6">[6]</a>: See the section on XV-5080 in RPC-1’s manual.<br></span></div> - <div id="insanch" style="height:3em;"></div> - <div id="footer" style=""> - <div id="pagesw" class="TText" style="width:100%;height:0.5em;"></div> - <div style="text-align:center;" class="TText"> - Proudly powered by SSBS <reduced style="font-size:70%;">(the static stupid blogging system)</reduced> 2.5 - <br> - Content licensed under CC BY-SA 4.0. <span id="purgep" style="display:none;font-size:70%;">This page has passphrase(s) stored. 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