uO_c 8hp ornament and crime.

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mxmxmx
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Post by mxmxmx » Fri Nov 02, 2018 5:12 am

degeneratedsines wrote:Hi, which is correct between the BOM and schematics for C22, C25, C26, C27: 330p or 560p?
I already have 560p installed, but I am still in building stage, so I don't mind replacing if that is worth it.
fwiw, it's more of a trade-off (not so much a question of correctness). in theory, the smaller the cap, the higher the cut-off frequency. when used as a quantizer, it's not ideal to have too much filtering going on, in other modes more so; we've ended up with 560p as a kind of compromise. i personally tend to use 330p or 220p or whatever i have, because i mostly use it as a quantizer. that said, in practice there's probably not a huge difference between 330p or 560p.

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degeneratedsines
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Post by degeneratedsines » Fri Nov 02, 2018 2:32 pm

it makes perfect sense, thanks a lot!

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Post by oudplayer » Thu Jan 10, 2019 1:45 pm

I'm doing the through-hole and jack/encoder/button soldering tonight on one of these (bought from synthcube), and confused about one extra part that was included in the box. Seems to be a pogo pin encased in plastic, and I think it'd go under the teensy, but it's not in the BoMs or the regular O_c build guide. It seems to be much taller than the included teensy headers. Do I need this? If so, do I need to get those pins that were displayed earlier in this thread instead of the regular headers?

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Post by Altitude909 » Thu Jan 10, 2019 7:45 pm

oudplayer wrote:I'm doing the through-hole and jack/encoder/button soldering tonight on one of these (bought from synthcube), and confused about one extra part that was included in the box. Seems to be a pogo pin encased in plastic, and I think it'd go under the teensy, but it's not in the BoMs or the regular O_c build guide. It seems to be much taller than the included teensy headers. Do I need this? If so, do I need to get those pins that were displayed earlier in this thread instead of the regular headers?
Its for the voltage supervisor and connects to the reset on the underside of the teensy

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Post by Staticcharge » Mon Jan 14, 2019 12:07 pm

Just a heads up for folk buying the PCB and panel from here:
https://pushermanproductions.com/produc ... crime-pcb/
The mouser cart:
https://www.mouser.co.uk/ProjectManager ... 1AD71074DB
Is wrong, it contains some through hole and not the 3904 transistors as well as a few other missing components. School boy error, guess I should have been more observant before ordering.
Put my build back a few days, that will learn me...

funkytransport
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ah bugger..

Post by funkytransport » Tue Jan 15, 2019 8:50 am

Ah Bugger! Just ordered that exact same combo...

Might have some left over. thanks for the heads up!



Staticcharge wrote:Just a heads up for folk buying the PCB and panel from here:
https://pushermanproductions.com/produc ... crime-pcb/
The mouser cart:
https://www.mouser.co.uk/ProjectManager ... 1AD71074DB
Is wrong, it contains some through hole and not the 3904 transistors as well as a few other missing components. School boy error, guess I should have been more observant before ordering.
Put my build back a few days, that will learn me...

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Post by j450nn014n » Tue Jan 15, 2019 4:10 pm

oudplayer wrote:I'm doing the through-hole and jack/encoder/button soldering tonight on one of these (bought from synthcube), and confused about one extra part that was included in the box. Seems to be a pogo pin encased in plastic, and I think it'd go under the teensy, but it's not in the BoMs or the regular O_c build guide. It seems to be much taller than the included teensy headers. Do I need this? If so, do I need to get those pins that were displayed earlier in this thread instead of the regular headers?
I have same kit and same problem. It's a pogo, so it compresses. Like a pogo stick. Has a spring inside. I think it goes on the board where it says reset, and then presses up against the reset tab on the teensy. That will allow the teensy to be reset without having remove the module from your rack. OR SO I'M GUESSING! I've asked about this on another form, and if I'm wrong/ or right, I'll report back.

Or, if you're done and you know, please tell me :)
Autistic. I like making noises at my workplace. I usually end up breaking something.

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Altitude909
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Post by Altitude909 » Tue Jan 15, 2019 7:09 pm

j450nn014n wrote:.. That will allow the teensy to be reset without having remove the module from your rack. OR SO I'M GUESSING! I've asked about this on another form, and if I'm wrong/ or right, I'll report back.

Or, if you're done and you know, please tell me :)
The voltage supervisor holds the teensy in reset till all the voltages are settled. This prevents the teensy lockup some people see on certain power supplies. The best theory on why this happens on some PSUs is that the positive and negative rails come up at different rates, teensy does not like this and refuses to start. it will work fine without it as long as you dont have a power supply that causes the lock up

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Post by j450nn014n » Tue Jan 15, 2019 7:15 pm

Altitude909 wrote:The voltage supervisor holds the teensy in reset till all the voltages are settled. This prevents the teensy lockup some people see on certain power supplies. The best theory on why this happens on some PSUs is that the positive and negative rails come up at different rates, teensy does not like this and refuses to start. it will work fine without it as long as you dont have a power supply that causes the lock up
Makes sense. I wish I'd seen some instructions that told me to solder it on before I soldered on the buttons, but otherwise it worked out well. Thanks for the explanation.
Autistic. I like making noises at my workplace. I usually end up breaking something.

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Re: ah bugger..

Post by Staticcharge » Wed Jan 16, 2019 7:51 am

I'll try and compile an up to date BOM cart on mouser for the uO_c build over the weekend, quess it would be useful.
Shame that some of the components needed are out of stock currently on mouser.....hmmm
I'm waiting for the Oled to arrive anywho.
funkytransport wrote:Ah Bugger! Just ordered that exact same combo...

Might have some left over. thanks for the heads up!



Staticcharge wrote:Just a heads up for folk buying the PCB and panel from here:
https://pushermanproductions.com/produc ... crime-pcb/
The mouser cart:
https://www.mouser.co.uk/ProjectManager ... 1AD71074DB
Is wrong, it contains some through hole and not the 3904 transistors as well as a few other missing components. School boy error, guess I should have been more observant before ordering.
Put my build back a few days, that will learn me...

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Re: ah bugger..

Post by j450nn014n » Wed Jan 16, 2019 8:21 am

Staticcharge wrote:I'm waiting for the Oled to arrive anywho.
What OLED are you ordering? I couldn't find the right one with the 7 pins, so I ordered a kit from synthcube. I'd really appreciate knowing the right part number. And from mouser? Cool.
Autistic. I like making noises at my workplace. I usually end up breaking something.

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degeneratedsines
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Post by degeneratedsines » Wed Jan 16, 2019 9:16 am

https://fr.aliexpress.com/store/product ... 40455.html

This was the one I used. First time I ordered from aliexpress. Not very proud of it but couldn't find a good alternative.

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Post by j450nn014n » Wed Jan 16, 2019 9:29 am

degeneratedsines wrote:https://fr.aliexpress.com/store/product ... 40455.html

This was the one I used. First time I ordered from aliexpress. Not very proud of it but couldn't find a good alternative.
Thanks. It doesn't look much different from the one I got from synthcube, but now I know how to get one for myself. much appreciated.
Autistic. I like making noises at my workplace. I usually end up breaking something.

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Staticcharge
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Post by Staticcharge » Wed Jan 16, 2019 12:00 pm

I bought this one:
https://www.ebay.co.uk/itm/Blue-Yellow- ... 2749.l2649
I went with the SPI version, glad you posted the previous comment degeneratedsines looks like the SPI option was correct.

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Post by degeneratedsines » Wed Jan 16, 2019 12:42 pm

SPI is actually recommended on the build instructions:
http://ornament-and-cri.me/build-it/#oled wrote:before inserting the display, make sure that the OLED is configured for SPI (see the resistors/labels on the back side of the OLED — there’s a slim chance it’s configured for “i2c”, which wouldn’t work).

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Re: ah bugger..

Post by Staticcharge » Sat Jan 19, 2019 4:32 am

funkytransport wrote:Ah Bugger! Just ordered that exact same combo...

Might have some left over. thanks for the heads up!
This:
https://www.mouser.com/ProjectManager/P ... 5358d4a607
Should be a complete component BOM for the uO_c build.
You may find there are a few components not available, 3904 transistors should be sourced elsewhere, like here:
https://www.ebay.co.uk/itm/40V-200mA-MM ... 2749.l2649
The lower part of the list you will find fixings you may already have. Some components have been rounded up to 10pcs as it worked out slightly cheaper.
Also this includeds the Teensy but not the OLED but other users have added a few links above. I hope this helps.

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Post by degeneratedsines » Sat Jan 19, 2019 5:38 am

Or replace with this one maybe : https://www.mouser.fr/ProductDetail/?qs ... yULQ%3d%3d ?
I may be missing something but their characteristics looks similar.

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Post by Staticcharge » Sat Jan 19, 2019 9:57 am

degeneratedsines wrote:Or replace with this one maybe : https://www.mouser.fr/ProductDetail/?qs ... yULQ%3d%3d ?
I may be missing something but their characteristics looks similar.
Nice one, looks like the item code has just changed since the original BOM were compiled.
I've just updated the compiled BOM so the link is still current.
Thanks.

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propertyof
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Post by propertyof » Thu Feb 21, 2019 6:39 am

Does anyone know where this panel from?
Are they available for sale?
I like the minimal touch design & there’s no screws above the screen frame like others...
Image

Thanks

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mxmxmx
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Post by mxmxmx » Thu Feb 21, 2019 7:20 am

propertyof wrote:Does anyone know where this panel from?
Are they available for sale?
don't think they're for sale individually but here's the name: https://www.modulargrid.net/e/other-unk ... o-c-silver

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Post by propertyof » Thu Feb 21, 2019 7:28 am

Thanks! I forgot to check the obvious modulargrid details :doh:

Turns out he’s MW user Virgil, will try to reach him.

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MMBT3904 Replacement

Post by gbel » Wed Feb 27, 2019 5:04 pm

Is this a valid replacement for the 3904 NPN's ?

https://www.mouser.ca/ProductDetail/Dio ... 96T1S7I%3D

Other than PD everything matches.

Thanks in advance!

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Re: MMBT3904 Replacement

Post by Altitude909 » Wed Feb 27, 2019 6:24 pm

gbel wrote:Is this a valid replacement for the 3904 NPN's ?

https://www.mouser.ca/ProductDetail/Dio ... 96T1S7I%3D

Other than PD everything matches.

Thanks in advance!
yes. hopefully 1.7million will last a minute or two

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Post by patrickod » Thu Mar 28, 2019 11:31 am

hey folks,

I'm building my first uO_C and managed to get a working powered-up module complete last night. On first run through everything works *except* the right encoder "switch" button functionality. The encoder increment/decrement input works however, and the joints don't show up any obvious issues under visual inspection.

I've reflowed the encoder pins, C33 to which the switch ground pin is connected, and the corresponding header and teensy pins to no avail. I have a spare encoder which I can substitute in later this evening but was wondering if anyone had hit this issue in their own build where something else was at fault? I'm unsure how likely the encoder is to be half broken in this way, or whether it's a red herring.

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Post by aragorn23 » Thu Mar 28, 2019 1:03 pm

Hi all,

I've managed to build one uO_C successfully, but my second attempt seems to have an issue: it switches on and everything appears to work but when I calibrate I just get a steady voltage of around 2.4v from each CV out channel regardless of the calibration settings.

Anyone else ever experience this problem or know what the likely culprit is? I did reflow the DAC already.

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