#1530

Okay, here’s confirmation about their positioning:

image
image3024×4032 3.4 MB

They go the way your image indicates. @a773

#1531

Thanks so much @kasselvania, I will now proceed. This (txi) have been on my list since I got a teletype, soooo many ideas where this will bring me, just hope I don’t mess it up
:slight_smile:

1 Like
#1532

Can’t wait to see what you come up with! Big fan of what you do with the TT and TXo, so I’m excited to be inspired to use my TXi more too!

#1533

Finished the build, works perfectly right off the bat, thanks @kasselvania !

Now, while making sure the new txi worked I went through everything (making sure i2c was fine with the 301 and the two (factory build, bought used) txo’s, and there was quite a few lose connections in those (three LEDs would go out when pushed slightly from the panel, one CV was dead), reflowing fixed two, now I’m down to

  1. in one txo one CV led is off, unless I push it, CV is fine
  2. in the other txo one CV led goes off if pushed, CV is fine.

Since I reflown the holes that connects the leds to PCB a few times, I’m thinging it might be something else.

  1. Any other location on the builds I should check/reflow that might be causing this?
  2. If the LEDs themselves are dying, what’s a good source (not mouser) that wont break the bank in shipping for two replacement leds? Tayda if possible? EDIT: Oops, link in BOM is already to tayda, sorry!!!

Anything else to check I didn’t think of? @bpcmusic ?
EDIT: maybe a small video would be in place:

#1534

Hi!

I’ve already purchased the TXo board from Pusherman. I am now on my way to Mouser to buy the components to build the module, but there’s one not available. The problem is that the factory lead time is 18 weeks … :no_mouth:

This is the component … https://www.mouser.es/ProductDetail/810-C1608X7R1H224KAE

Does anybody know what other capacitor could I use instead of this? I have no idea about electronics so I’m stuck …

#1535

You should be fine with most any other 0.22uf capacitor, as long as it’s also 0603 case size! I think you can search on mouser by capacitance & case size.

If you click the checkboxes under ‘search similar’, and you highlight;

Capacitance: 0.22 uF
Voltage Rating DC: 50 VDC
Dielectric: X7R
Tolerance:  10 %
Case Code - in: 0603

there are 21 alternatives - I tend to just pick the cheapest with most in stock.

#1536

Thanks @ganders! Yes, as soon as I posted here I searched for alternatives at Mouser. I’ve already order the project items.

#1537

JFC. Okay. So I found my problem: it thinks all of my address pins are shorted? Or something? I can read it in TT by reading the last address set. After staring at the code for a few minutes, I figured out that the fact I seemed to be getting a configID of 111 most of the time was weird, as that meant the pins were being read as high, despite having nothing connected. They stay that way too. Is there some silly thing here I am overlooking? Actually setting the jumpers has no effect. I can’t seem to find any bridging when I continuity test everything, so I’m not sure why they’re being read as such. Anyone run into this? Also, it’s happening on both of my units, so hmm.

#1538

Those header pins are connected directly to the Teensy’s digital input pins and there doesn’t seem to be any external pull-downs. Are internal pull-downs set anywhere? I am just spitballing here…

1 Like
#1539

I was wondering about that too. From my quick look at the Teensy documentation, there is an internal pull-up mode, but the source code isn’t using it, and it defaults to inverting the high low read behavior. I guess it’s something I could experiment with, but yeah, the schematic doesn’t have any resistors in that path. That was also my suspicion, but I also assume it should work because there are already so many units working out in the wild using the standard source code? (For the record, I am using the Pusherman boards, but there is nothing to indicate anything is different than the current GitHub versions of the files.)

#1540

I would probably just hardcode the addresses and move on, not that that’s helpful for your troubleshooting :slight_smile:

1 Like
#1541

I’m underslept at the moment and hadn’t considered that! So a welcome suggestion! :laughing:

That said, I would still like to get it working hack free, but that does give me a work around. I’m hoping to do some crow dev work with it this weekend, and that might do the trick.

1 Like
#1542

I had a problem with my TXi that @GoatFarmer built for me. Annoyingly, I can’t find my notes about what the problem was exactly, but I’m pretty sure it’s the same as you found. We ended up fixing it in the firmware (again, I’m so sorry I can’t find my notes of what we changed!). Now it works perfectly. It really baffled us for a while since we assumed it must be a hardware problem and it was only by looking carefully at the code that we discovered that it shouldn’t really work as it stands. Maybe something has changed about how the floating voltages on the teensy work?

If I can find the relevant file (or maybe @GoatFarmer will remember), I’ll let you know.

1 Like
#1543

Quick q, now that I’ve finally got my hands on a 16n, I was wondering if anyone makes a TXb? Or do I need to go hunting for the BOM and panel myself?

#1544

TXb Github

There you go. I saved you 10 seconds effort :slight_smile:

I think BPC music is the sole maker of them. There’s a TXb commerce thread you could ask in.

#1545

Pusherman is your best bet.

2 Likes
#1546

If you don’t mind a tiny bit of DIY, the MSW F8R expander can be modified to suit your needs. It just needs 3.3V to power its I2C repeater chip, so a single regulator is all you technically need to add.

1 Like
#1547

FWIW, i already have a powered i2c board, it’s just the ease of connection from front panel that I’m lacking.

#1548

Probably at RTFM, but just bought boards for DIY Teletype and TXo and TXi Expanders.

Will I need also to source an ii backpack/busboard to connect both expanders, or can they be daisy-chained from the single header on the Teletype?

#1549

You shouldn’t need a backpack for just those.

Be sure to read over all of the documentation: https://github.com/bpcmusic/telex/blob/master/extras/TELEX%20Documentation.pdf

Don’t overlook the extras folder:

Does anyone know if it’s possible to do jack detection on the TXi in’s? I’d like to be able to use dummy cables to do some configuration, but I don’t actually know how modules that do jack detection work. :sweat_smile: