Telex: Teletype expanders

Awesome work… Could you please also announce the availability of the expanders in this tread (in order for us to receive a notification email :slight_smile: …)?

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these look fantastic

in no way trying to downplay that, but RE: teletype font, are you looking for it to match the teletype or did you want it to be a bit distinct? if distinct, than sweet, and it feels part of the system and adds a little bit of distinction

If you’re looking to match you likely just need the italic version of the font, or you could cheat and use “faux italic” which is an option in some programs or you could skew the characters

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only if you’re interested / if it helps, here’s a standard vector file of the type for your module

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looks great!! curious about your i2c ribbon cabling scheme, any photos?


wow, yea those look great indeed - if it makes sense to ship them to overseas and they behave with the trilogy modules on the bus I can imagine wanting on or two of them!


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had totally forgotten about this i2c discussion

so the manner it’s been implemented…can these be connected to either TT or aleph w/o soldering? apologies if you already answered elsewhere @bpcmusic

(as an aside this panels and the 16n you built are gorgeous . monumental achievement!)

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@tehn - sure. :slight_smile:

i purchased some female to female jumper cables, broke it off in groups of three and bound the female ends together with trimmed black electrical tape. it is a little long for the 4HP runs - but pretty flexible generally and easier to put in the rack as there is some slack.

at the forum’s suggestion, i have two groups of pins separated a bit on the board. makes daisy chaining the i2c quite easy!



Thx for all the nice feedback. Few quick answers:

@martinmestres - yup, will do! announcement will also appear on this thread.

@tambouri - yeah; should have looked at them side-by-side. was focusing on illustrator. italics looked strange with the lower case i and o - so i undid it. looking at it next to the TT, i regret it. next run will have italics and matched weights (my numbers are a little light and my names a little bold). not going for exact … but these fixes are easy. :slight_smile:

@Leverkusen - cool - don’t forget that the ansible also adds expander capability (and a whole bunch of other cool stuff too) - might also suit your needs.

@gila - yeah, i’ve been dealing with some other things while i research and think through what to do. i have some ideas i’m going to try shortly. in answer to your question: no soldering to the TT is required, it ships with the i2c header attached. just grab some jumpers and you are off to the races.

i haven’t looked at the aleph yet as the i2c implementation for it is not complete. once these are in people’s hands, i’ll start looking for someone to partner with on seeing what we can add to the aleph that will make use of the TX.

actually, that last paragraph isn’t quite true; i looked at the aleph enough to understand the i2c jack schematic and add it to the 16n boards i built a few weeks back. going to take a look at connecting it to the expanders soon and see if i can power 16 CV signals with the faders (and 16 activity triggers).

arg. too many projects. :wink:



Would definitely be interested in the TXi! Does it work with the stock Teletype firmware, or require custom modification? I’m curious what the syntax looks like for different params and ins


Great news, panels look good enough for me. Will be checking this thread more often now :slight_smile:
Good work, keep it up.

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Just noticed that I missed replying to this, @xeric. Apologies - I’ve been traveling.

Teletype needs to be loaded over USB with a build of the firmware that has the code to support the Telex in it. Right now, that is a custom fork of the software. All other things are the same - just some new commands for the expanders.

The TXi (input expander) has a syntax that is similar as well:

TI.PARAM 1 - 4
TI.IN 1 - 4

and it returns the value from each of the four inputs on the device. More than one input expander, just reference the next set of numbers (5-8).




Awesome! Thanks for getting back. Definitely could use one of these - I find a lot of the ideas I wanna develop for Teletype leave me wanting more input control, so this is perfect. That syntax seems intuitive to me, and I can already imagine a million uses for this :smile:

@bpcmusic looking forward to a pull request when you are ready!


need to turn my attention back to the TT code and nail the final couple of issues.

think you should have held back shipping on my Ansible till I got that done. :wink:




Poke. Any updates? :cat:

Definitely going to buy one of each! What’s the timeline on this project?

awesome!!! definitively I need it!!

Apologies, all. I seem to have missed the latest posts above. Life, work and a major computer upgrade have had me playing serious catchup. (I’ve only really had time to attend to things that require zero brainpower for the last while.)

As for my progress, I think I’ve gotten the new Mac fully up and running with Eagle and my dev tools. Took a bit to get back in the swing with it. I’m finishing up a code migration from my working branch to the latest Teletype branch. The TT’s code changed quite a bit with the inclusion of the operators branch and the refactoring of the II communications code. It is taking more time to bring my branch in line - but it will be much cleaner once I’m done.

First and foremost, I’ll make sure that the latest PCB, BOM, software, and panel files are up soon for any adventurous folks who like SMD DIY. The expanders are open source and free to make and remix as you see fit. Also, if you know a good builder who does work for hire, this will be an ongoing great way to get a few made without having to do it yourself (or deal with a novice like me).

I’m going to build one very small run of units for those without the DIY bent. The price will fluctuate depending on how many I end up making (component cost varies based on volume). Here are the details.

Approximate Pricing:


  • PCB: approx. $28
  • PANEL: approx. $15
  • Assembled: approx. $150


  • PCB: approx. $28
  • PANEL: approx. $15
  • Assembled: approx. $120


I’ve never done this before, so I’m not sure how long it will take me. PCBs are 4-layer and can take 3-4 weeks. Parts are pretty common and should arrive quickly. Panels have taken as long as eight weeks to get made and shipped. I’m set up to do meatware pick-and-place and have a reflow oven to do multiple boards at a time. Assembly should go quickly once everything is in hand. So … maybe eight to ten weeks from start to finish for a small batch? No promises.

Signing Up:

PM me to let me know if you are interested and I’ll put you on the list. Please only reach out if you are serious about grabbing the expanders and are willing to be patient as I work my way through this process. My single largest fear of doing this is facing unforeseen delays and having a horde of grumpy folks turn my desire to contribute into something sour. If you need expansion capability quickly, please grab an awesome Ansible or a soldering iron. :slight_smile:

I’ll gather interest for a couple of weeks before I close it out and kick the production process off.

NOTE: I am not asking for, nor do I want, any payments until the units are assembled, flashed, tested, boxed, and ready to ship. That way, the only risk with expressing interest is that I’ll actually be able to pull it off and have something to send you (at which time I hope I can cover my costs).

New Things I’ve Learned:

It is tricky going from having completed working prototypes to a micro-production state. I now clearly know why that mxmxmx (Ornament + Crime, Terminal Tedium, Temps Utile, etc.) open sources his designs, sells a few PCBs and lets everyone else figure out the rest. That is a lot easier than figuring out the myriad of details required for selling a completed piece. It is a different type of “fun” than the designing, coding, testing, and the experimenting phase. And, it takes just about as long.

Hats off to those who successfully make a business out of it; serious respect.


Awesome! Building at least one TXi for sure. Thanks so much for your hard work and keeping us updated.

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definitely interested in both!

Thank you for your work on this!

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