Teletype hardware: open

[Gerald_Stevens]

I used a Dremel tool to cut all the pins off U3, and cleaned up the little bits left behind. Soldered in a new U3, and LO-it all works! Thanks to all for talking me through the possibilities. I had a moment of self doubt last week, and I ebay’ed a used teletype for $275. I also ordered another U3 DAC that got here first. Two teletypes? The possibilities!

[Gerald_Stevens]

One last bug solved. This one is weird enough I’m posting it. My input jack’s voltage divider wasn’t working, so it would max at 3.3V due to the protective diodes. Turns out a tiny via to AGND wasn’t connected on my pusherman board. Weird manufacturing defect. Here is my quick fix:

[reijo]

These kind of bugs are so mean. I remember having a circuit board on which two tracks were connected which shouldn’t be. Don’t know how often I reflowed things, searched for shorts between components, took of components, replaced… it drove me crazy

Nice that you found out!!

[toneburst]

@Gerald_Stevens

What’s the module at the left of the case?

[Gerald_Stevens]

@reijo - yes, I can’t believe I found it in 30 minutes. This kind could take much longer. It helps that all the circuit needs to do is divide a voltage - it wasn’t doing that, and all the resistors were the right values in the right place, only thing left was that ground wasn’t ground. Lucky this time!

[Gerald_Stevens]

@toneburst - a seismic industries compute module prototype. It is a TT (the other TT - a mxmxmx terminal tedium) running ORAC - super powerful and easier to grok than a teletype. Raffi is currently trying to make it even smaller - and he’s notorious for ultra-slim module depths

[toneburst]

Cool. I have a TT board, but the lack of a builtin screen put me off ever getting round to assembling it. This version looks like a better bet.

[Gerald_Stevens]

@toneburst, If you ever get the urge, build the TT and add a couple of oleds… easy to do. Orac works with that combo now. @okyeron and I got it working a couple years ago:

@old.man.fury

[toneburst]

I prefer the slightly more integrated look of the screens on the Seismic version, to be honest.

I’m aware of ORAC, as I’ve installed it on my Fates. It’s a very cool thing!

[Gerald_Stevens]

So, in a moment of self doubt, I bought a used teletype (stock early version, I believe). I was eager to see how the screen mounts (spacers, connectors) to see if I can do better with mine. Its screen is at a wonky angle… is that normal?

[madeinspace]

Hi guys,

Quick question I’ve ordered the 64kb flash MCU but is that enough ?, just realising there are a few flavors of the MCU that can go up to 512kb flash.

thanks

[jmsiener]

Man, I know this doesn’t really help answer your question but I thought it might be handy for others to see. I used the legs from a bunch 1N4001 diodes instead of the pin header to get this sort of profile but I use the female header listed in the BOM so the screen is still removable.

[Gerald_Stevens]

@jmsiener, yes it is helpful. I bought the low profile header that @okyeron uses for fates, and put the screen header through the top of the screen, clipping the top leads off. That worked well, will take a photo next time it is apart. Just wondering about the tilt on the stock one before I plug it in.

[tehn]

the tilt is fine, not even noticeable in use.

[csboling]

@madeinspace

up to 512kb flash

Yeah I’m pretty sure 64kb is not enough, stock Teletype uses the 512kB chip for sure and there is a lot of storage used by patterns and such, as well as just all the continually growing firmware code.

[psychic_chasm]

pusherman did a restock of teletype pre populated boards, does anyone know if the errors in the components have been corrected?

[forrest]

I picked up two of them, they look great to me, the parts listed on the pusherman product page for those are the only things missing aside from the screen, potentiometer, usb jack, switch, jacks, standoffs, lightpipes and pin headers (screen/i2s/power)…

[forrest]

Just finished one of the new pusherman batch… Works great! Bought some 2mm acrylic and sanded down a square to fit in the recess, a lot cleaner though maybe glare will be a problem, better than smudges on the screen I think… I figured I would wing it with what I had on hand for the spacers/headers… was a bigger pain than I imagined, I recommend using the mcmaster stuff from the github repo and don’t wing it like I did Overall I love it! One of my favorite builds, thank you monome/tehn for making this available!

[in-fm]

Hey all! Been lurking here for a while but am excited to get started on my DIY Teletype.
After reading through this thread and gathering notes on the adjustments and substitutes that are needed in the build. I think I have the BOM all together but it looks like one of the DACs is backordered everywhere. Would this be an alright substitute? I’m still learning about the actual components and things

[kburwash]

Edit: nevermind… Found the manual dfu programmer instructions on the monome site and got it to work!