Old Crow Crowminius for Eurorack DIY build

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Staticcharge
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Old Crow Crowminius for Eurorack DIY build

Post by Staticcharge » Sat Apr 21, 2018 7:38 am

Whoop, the Panel and PCB kit arrived today from Modular Addict.
I don't seem to be able to find an up to date BOM for the v1.3/v1.31 PCBs.
This thread is for those that have bought the kit from MA and may be looking for additional information on the build as there is no documents provided with the kit.
All information that I've managed to find is for the suitcase version though the main PCBs are part of that there doesn't seem to be any photos or useful information to aid the DIYERs attempting to build their own.

At first glance I think I will be using the Song Huei 9mm pots to free up space between them for those of us with fat fingers. My initial idea was to use the t18 9mm pots with Bafaco type micro knobs but didn't want the nuts and washers showing. in addition, the T18 type pots aren't available in 5K or Rev Log types from Thonk.
Still currently at the component sourcing stage I may look into other suppliers to reduce costs on shipping from different places.
I've also contacted Scott to see if he has a current BOM and information on a few questions I have on the build, Results will be added as and when they are received.

If any wiggler has build information and tips please feel free to add them below.

I hope the information in this thread will be of use to others.Image
Image

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Staticcharge
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Post by Staticcharge » Sun Apr 22, 2018 1:40 am

ADDITIONAL INFORMATION CAN BE FOUND HERE:
viewtopic.php?p=2813520#2813520
It's become part of the original thread, have a look at the last 10 or so entries.

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Post by mutronic » Mon Apr 23, 2018 1:19 pm


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Post by Staticcharge » Wed Apr 25, 2018 1:56 pm

Perfect, thanks.
This should help with others interested in building the modules.
Additionally, I've emailed Scott and asked him to add the code for the ATTINY85 IC to this thread so other can access it, waiting for a reply. How did you get on flashing the firmware, any issues?

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Post by mutronic » Thu Apr 26, 2018 12:14 am

Staticcharge wrote:How did you get on flashing the firmware, any issues?
I haven't gotten the kit yet, but hope to soon.

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Post by Staticcharge » Thu Apr 26, 2018 11:02 am

I'm building Module B first so as the boards a complete I'll photograph them and post them up. There are very few photos if you google it and what photos there are aren't overly clear.
I've sent email number three to Scott to the email address he provided so hopefully the code for the ATTINY85 IC is en route to everyone that will need it.
I would have thought the IC would have been included pre flashed with the Panel & PCB kit as it's a non standard item. There is no information on the MA website stating that the IC will need to be flashed nor is there any information in the BOM other than 1NO ATTINY85 MICROPROCESSOR.
Guess I'm the ass because I assumed....Whoops, any how hopefully this thread will be of use to others that assume.

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Post by Staticcharge » Fri Apr 27, 2018 10:17 am

Code for the ATTINY85 IC can be found here:
http://www.cs80.com/crowminius/euro/
I'm going to flash it this way as I already have an UNO:

and I would think Arduino would do the job:
https://www.arduino.cc/en/Main/Software

EDIT:
Flashing can also be done this way:
http://riteshkhanna.com/2016/04/20/prog ... rogrammer/
I'm still waiting for a few components so this method is untested. Update to follow.
Last edited by Staticcharge on Thu May 03, 2018 1:15 pm, edited 1 time in total.

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Post by oldcrow » Fri Apr 27, 2018 2:40 pm

Just make sure the fuses are set as noted in the source file. I use the avrdudess program which has settings for them, although you can also
put them on the CLI/command line in a shell window. The .hex file should have these fuse settings and show up in the GUI when the file is loaded.

Crow
/**/
Staticcharge wrote:Code for the ATTINY85 IC can be found here:
http://www.cs80.com/crowminius/euro/
I'm going to flash it this way as I already have an UNO:

and I would think Arduino would do the job:
https://www.arduino.cc/en/Main/Software

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Post by Staticcharge » Fri Apr 27, 2018 2:45 pm

oldcrow wrote:Just make sure the fuses are set as noted in the source file. I use the avrdudess program which has settings for them, although you can also
put them on the CLI/command line in a shell window. The .hex file should have these fuse settings and show up in the GUI when the file is loaded.

Crow
/**/
Staticcharge wrote:Code for the ATTINY85 IC can be found here:
http://www.cs80.com/crowminius/euro/
I'm going to flash it this way as I already have an UNO:

and I would think Arduino would do the job:
https://www.arduino.cc/en/Main/Software
Thanks for the heads up Scott.

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Post by Staticcharge » Fri Apr 27, 2018 3:02 pm


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Post by Staticcharge » Sat Apr 28, 2018 4:27 am

After trawling the threads and anything I can find regarding these modules there seems to be one constant, lack of space between the knobs for maximum use of the full rotation. After offering up the 1900 knobs on to the panel of Module B, the module I'm building first, I can see the issues that this may cause further down the line.
I've gone for the Song Huei pots as well as the Befeco type micro knobs that will be added once the module is complete.
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Post by mutronic » Sat Apr 28, 2018 11:52 am

Would you happen to have an idea of the HP size? I can't find the modules on modulargrid.

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Post by Staticcharge » Sat Apr 28, 2018 1:27 pm

mutronic wrote:Would you happen to have an idea of the HP size? I can't find the modules on modulargrid.
30HP each module the same size in total as this one:
https://guinguin-instruments.ecwid.com/ ... -p58805985
Has your kit arrived yet?

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Post by Staticcharge » Sat May 05, 2018 5:40 am

With module B finished there is a few issues:

*Longer board to board headers should be used because once the main board is populated the capacitors stand to high for standard headers to seat fully.
**The ATtiny85 flashed ok but I have no response from the 440 switch but I'll look into that.
Other than that the module works fine, filter calibrated to respond the same way as my AJH Ladder filter and VCAs calibrated accordingly. A user did post the official Minimoog service manual on the thread linked in an earlier post if you wanted to calibrate it to the original Minimoog spec.
The Song Huei pots are working well and I would recommend this change for ease of use.
I've used 1% resisters and a few 5% because that's what I had and I tried to keep costs to a minimum, Filter still sounds good.

Image
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Last edited by Staticcharge on Sat May 05, 2018 1:20 pm, edited 1 time in total.

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Post by KSS » Sat May 05, 2018 6:44 am

Seeing these panels again noticed one is an Oscillator panel and the other a Contour gen filter. Module O and Module C. Old Crow indeed!
Image
Last edited by KSS on Sat May 05, 2018 11:59 pm, edited 1 time in total.

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Post by GryphonP3 » Sat May 05, 2018 12:13 pm

Man I just sold my old oscillator mini and want to build this so bad >.< Why does my backlog have to be so long.....
My cat can eat a whole watermelon ...

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Post by Staticcharge » Sat May 05, 2018 12:33 pm

KSS wrote:Seeing these panels again noticed one is an Oscillator panel and the other a Contour gen filter. Module O and Module C. Old Crow indeed!
Image
This is a build thread KSS, though your renaming may be logical, I started this thread because the BOM is illogical so with all due respect the name of the modules is the least of Scotts worries.
What would make sense is to supply a pre flashed ATtiny85 chip as well as more information. I'm ok with electronics but for folk less knowledgeable I think it would be a great help. Threads can sometime get clogged up with pointless comments and you just end up trawling the pages of nonsense to find the answers you want. That's why people start new threads on topics already listed.
Last edited by Staticcharge on Sat May 05, 2018 1:09 pm, edited 1 time in total.

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Post by Staticcharge » Sat May 05, 2018 1:04 pm

GryphonP3 wrote:Man I just sold my old oscillator mini and want to build this so bad >.< Why does my backlog have to be so long.....
Once I had all the components it went together really quickly with little fuss.
A really enjoyable build. I'm posting photos to give people an idea of components used as the BOM is a little unclear.
The filter sounds really nice with three frequency central VCOs feeding it saw waves.

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Post by KSS » Sat May 05, 2018 11:51 pm

GryphonP3 wrote:Man I just sold my old oscillator mini and want to build this so bad >.< Why does my backlog have to be so long.....
@Staticcharge-You mean posts like this which have nothing build related?

I get what you're saying. Do you see there's another side too? I purposely posted a minimal entry in this thread so Scott could see it. One short sentence and one photo. What matters to him is up to him.

@GryphonP3 Please take no offense, your post was fine. Having just been scolded for my single post, yours presented a related example.

edit: I've cropped the pic to reduce its impact on your goal. If you remove it from your scolding repost, the footprint left will be minimal. /edit

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Post by Staticcharge » Sun May 06, 2018 1:26 am

KSS wrote:
GryphonP3 wrote:Man I just sold my old oscillator mini and want to build this so bad >.< Why does my backlog have to be so long.....
@Staticcharge-You mean posts like this which have nothing build related?

I get what you're saying. Do you see there's another side too? I purposely posted a minimal entry in this thread so Scott could see it. One short sentence and one photo. What matters to him is up to him.

Thanks KSS, I'm glad you didn't take my comment the wrong way. After buying this Panel and PCB kit, I've been able to find very little info about the Euro build and trawling through the chaff has taken up so much time, hence starting this thread. I do get your point, not sure why they had to be Module A/B at all. Have you built the module, did you encounter any issues with flashing the ATtiny85 IC?

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Post by duff » Sun May 06, 2018 2:08 am

Staticcharge wrote:Threads can sometime get clogged up with pointless comments and you just end up trawling the pages of nonsense to find the answers you want
This might go down as a 'pointless comment', but...

This is the problem with using a thread based conversation board to hold key information required to build a module. It is far from ideal and there are much better tools out there, however they don't have the surrounding community/ visibility.

The only way it works here is if the pertinent information is moved to, or referenced from, the first post. Unfortunately the only person who can do this is the thread starter who may or may not be able or willing to ensure it is maintained over time regardless of initial intentions.

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Post by Joe. » Sun May 06, 2018 2:50 am

Staticcharge wrote:Threads can sometime get clogged up with pointless comments and you just end up trawling the pages of nonsense to find the answers you want
I'm sure a lot of people scroll through most build threads at high speed, looking for images or searching for specific part numbers.

well that's what i do most of that time anyway :hihi:
Last edited by Joe. on Sun May 06, 2018 3:17 am, edited 1 time in total.

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Post by duff » Sun May 06, 2018 3:12 am

LoFi Junglist wrote:
duff wrote:Threads can sometime get clogged up with pointless comments and you just end up trawling the pages of nonsense to find the answers you want
I'm sure a lot of people scroll through most build threads at high speed, looking for images or searching for specific part numbers.

well that's what i do most of that time anyway :hihi:
That's not my quote
Staticcharge wrote:Threads can sometime get clogged up with pointless comments and you just end up trawling the pages of nonsense to find the answers you want

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Post by Joe. » Sun May 06, 2018 3:17 am

duff wrote:That's not my quote
not sure how that happened, but we've managed to add more trash to thread now :party:

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Post by dubonaire » Sun May 06, 2018 3:30 am

LoFi Junglist wrote:
duff wrote:That's not my quote
not sure how that happened, but we've managed to add more trash to thread now :party:
It happened because reading and engagement have become secondary to point scoring.

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