Move blog posts out of the tree.

author: Chris Xiong <chirs241097@gmail.com> 2024-06-22 19:59:16 -0400
committer: Chris Xiong <chirs241097@gmail.com> 2024-06-22 19:59:16 -0400
commit: 4e1a29cab8d31cff30d88d2dfc0f526372fc33bd (patch)
tree: 7a0c9b5d4a57ed734018b447eafdf5f51ab43151 /blog/post/2024-02-04.html
parent: e81928f76ab105c65a0a0997c289f0f521589128 (diff)
download: web-4e1a29cab8d31cff30d88d2dfc0f526372fc33bd.tar.xz
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-	<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 &amp;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 &amp;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>
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author	Chris Xiong <chirs241097@gmail.com>	2024-06-22 19:59:16 -0400
committer	Chris Xiong <chirs241097@gmail.com>	2024-06-22 19:59:16 -0400
commit	4e1a29cab8d31cff30d88d2dfc0f526372fc33bd (patch)
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