| Author |
OBX voice card (with non-custom CEM3310 equivalent circuits) |
| EMwhite |
By the time you get done soldering [EDIT] ~2,100 components you are going to want to mount it on a pedestal in the middle of your room with spot lights shining on it from every angle as if it was sold by Swarovski.
Looking at Crow's partial build is starting to make me nervous (board weight perspective. So maybe a plexi case with slots grooved on each side wouldn't be a bad idea. I may work something up with a base footprint that rests nicely on my Kurzweil.
Btw: my panel is finished and on it's way to me, should arrive Friday. If the holes don't line up, it will be relegated to control my multi-voice SEMs project  . Couldn't resist taking advantage of that 20% off special. Will see  |
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| negativspace |
| 1200... I routinely do that in a day or two of building Manhattan Analog modules. Sounds fun! |
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| mOBiTh |
i can't stand perspex cases, yuk, they're so bendy (especially on one this big!) and cheap feeling, and the edges feel horrible 
Think I'm gonna go wood and metal with plenty of ventilation  |
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| oldcrow |
| EMwhite wrote: | | Looking at Crow's partial build is starting to make me nervous (board weight perspective). |
When it is finished I will have a support system in place to hold the voice cards. I originally wanted to install them vertically, but they're too long to fit in a 5U height. So, I will use between-board nylon spacers and an edge frame. --Crow |
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| The Real MC |
| Verified large shipment of components from Digikey from my BOM, and all is correct!! |
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| The Real MC |
| oldcrow wrote: | Slowly the master vision takes shape: here is a nearly-finished host board with a fully-populated carrier board mounted to it, and the carrier board loaded with a slot adapter and attached crowbx voice board.
 
More later,
Crow
/**/ |
That is (going to be) one seriously dense module! |
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| gslug |
| That is one seriously impressive piece of gear! The TSSH is what finally persuaded me to join the forum, but I'll have to get one of these too... |
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| suitandtieguy |
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| mikecameron |
| Just added the rev1 single voice and rev. 2 4-voice crOwBX to the gear list for Knobcon. Looking forward to getting my eyes and ears on this thing oldcrow! |
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| oldcrow |
Due to the dense packing of boards, I knew there would be a few "interesting" mounting requirements for the larger components in the "regulator" corner of the voice and slot adapter boards. It turns out voice boards #2 and #4 along with slot adapters #1 and #3 will use a capacitor mounting scheme like this. Perhaps in a future rev I'll go to SMT electrolytics.
Voice board, the slot card is shown positioned closer than the actual mounting dimension to verify the clearances.
 
Slot adapter capacitor and 78/79L15Z regulator detail. Also note the close trimming of the KK156 male headers needed on slot adapters #1 and #3.
 
Almost done with first of four rev2 voice boards... |
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| negativspace |
| Mouser stocks a pretty good array of through-hole aluminum organic polymer caps, it might be worth a browse through their catalog. I've used some 100uF that are only 5mm high or so and would probably work here. |
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| oldcrow |
| negativspace wrote: | | Mouser stocks a pretty good array of through-hole aluminum organic polymer caps, it might be worth a browse through their catalog. I've used some 100uF that are only 5mm high or so and would probably work here. |
Yep, I'll have a look at other cap case types. I'm just using what I have here already for these proof of concept builds. --Crow |
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| The Real MC |
| Axial caps may be another solution |
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| oldcrow |
My Haribo "Gold-Bears" sample packet arrived today. It came with this complimentary front panel! 
 |
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| mikecameron |
"REV 2 Knobcon Edition"
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| baylortrewerton |
| oldcrow wrote: | | parquix wrote: | | Is there sound demo out there? Can't wait to hear it! |
Getting to that as soon as I can, right now I am trying to build and test a full rev2 4-voice system in time for a conference. --Crow |
Does this mean you're going to be at Knobcon? I was on the fence before, but now.... |
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| negativspace |
| Those panels they send with the gummi bears rock. |
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| oldcrow |
| baylortrewerton wrote: | | Does this mean you're going to be at Knobcon? I was on the fence before, but now.... |
Yes. I would have gone last year if I'd known about it: the place is 20 minutes from my house.  |
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| oldcrow |
One rev2 voice board done, three to go...
 |
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| paults |
Over 65 trimmers??!?  |
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| oldcrow |
| paults wrote: | | Over 65 trimmers??!? |
Err...yes?  Cmon its not like it is a rev2 Prophet-5. Or a CS-80. |
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| paults |
| CS-80 is like 270 total, as I recall. So 64 is 'better'. |
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| The Real MC |
| oldcrow wrote: | One rev2 voice board done, three to go...
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Looking forward to assembling mine... the OB-X is sitting in the auditorium at work, ready to pull off "Birdland" today. |
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| chrissugar |
Congratulations Oldcrow, fantastic project. I have an OB8 and would love to add the OBX sound to my setup (even a monophonic OBX).
I didn't read the whole thread so sorry if it was already answered. What is the estimated price for one voice board PCB and for one control board PCB ?
Any idea when will this project be available?
chrissugar |
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| EMwhite |
When I was a kid, I got Ice Skates for Christmas. I laced them up and skated around the living room imagining that I was on ice except it was the 1" shag carpet. My parents were not pleased.
This arrived today so of course, I had to round up some spare switches, jacks and a volume pot (not to mention my lone Oberheim knob) and put it all together to see how it will one day look.
And then I promptly put my family on notice, not to expect to see me much between the date that the boards arrive and ... well, they will know when they hear the beast!
Only thing missing... hint, hint
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