The new version is build. Although I was a bit in a hassle and tried a few things, therefore its not the cleanest build, I can confirm that the Gerbers v2 on git are exactly working as expexted. So I think now is the time that anyone with intrest can use these files to manufacture boards.
I further provided a simple BOM with a few notes.The Language is somehow atrocious but i will invest some work in it later. I used this file too and i think component wise it is more or less error free. It is mostly THROUGH HOLE, and if you not feel confident to solder these 1206 bypass capacitors, you can try to substitute them. At reichelt I have seen IC sockets integrating tne mounting of a mlcc cap which can be used instead. Although one capacitor c15 has to be a 1206 SMD:
Further you find on Git my Proteus Project file. Feel free to modify or simulate resistor changes.
At last some files for panel designs are uploaded. I got mine from Schaeffer but I think its a bit of a rip off
Regarding the expenditure for one module. I payed approx
50€ Components at reichelt and tayda
3-10€ PCB
CEM CHIP 28€ on ebay
and 35€
for the panelSo a bit more than 100€ should get you there.
Ill tried to make a vid but I have not really the best hardware for it, i decided to have another go. My Personal judgement is that PWM and PULSE is the main highlight of this VCO as it is thicker and warmer than anything I created before.
Potential flaws in the design are that the LED has to be creatively mounted and there is a bit of a dead zone on the manual pwm knob.
I will take a rest from this project for a few weeks.
PS: The documents on git will be updated from time to time. The gerbers will stay ficed. Hope its workable, i will try to make them a bit better soon.
[soundcloud url="https://api.soundcloud.com/tracks/291811899" params="auto_play=false&hide_related=false&show_comments=true&show_user=true&show_reposts=false&visual=true" width="100%" height="450" iframe="true" /]
[soundcloud url="https://api.soundcloud.com/tracks/291483196" params="auto_play=false&hide_related=false&show_comments=true&show_user=true&show_reposts=false&visual=true" width="100%" height="450" iframe="true" /]
[soundcloud url="https://api.soundcloud.com/tracks/291532214" params="auto_play=false&hide_related=false&show_comments=true&show_user=true&show_reposts=false&visual=true" width="100%" height="450" iframe="true" /]
[soundcloud url="https://api.soundcloud.com/tracks/291486351" params="auto_play=false&hide_related=false&show_comments=true&show_user=true&show_reposts=false&visual=true" width="100%" height="450" iframe="true" /]
UPDATE 4
Ill actually ordered one test board in Germany which should arrive in 7 days, since I sadly have to go to hospital in 2 Weeks time and I definatly want to press this project through before that. Git is a bit messy still but once Rev 2. will be proved working, I'll fix it and provide a Video a detailed BOM a Cart a validated Boad and a Project File or what else is needed. For all of you which have been put off by the non pleasing look of my beloved wood prototype board, Ill uploaded some eyecandy and replaced the header with 3d Cad data of a preliminary Panel and the Board.
A FEEDBACK would be welcomed I am no experienced Grafixdesigner and maybe some other have clever ideas to make it better. I definately would appreciate that very much
Some requests about 4U here, I also want to move away from Eurorack, but I have no clue about technical details. Feel free to mod it to your needs just reference me for the fame
.UPDATE 3
Revision 2 boards ordered. Should arrive in 2 weeks. Will upload additionally old revision 1 and the sync chicklet, which is needed for syncing to VCO with low output.
UPDATE 2
https://github.com/xnotox/CEM3340
I have uploaded updated gerbers and schematics, aswell as 3d impressions of the board. I will give them another check tonight and send them to the fabhouse. I did not alter that much, therefore I have high hopes that they are working as good as the current version, without the need of a chicklet on the sync jack. Meanwhile Ill drop from time to time more demos here, maybe a vid, to eventual spark some interest. I would be happy if my work, would find a place in a few diy racks.
If you have any recommodations to make, now is the time for it.
Changes:
- Switched to 9mm Pots to create space for mounting holes (perhaps an stackable adapter with no wiring)
- Added Opamp-amplification on the Sync bus, should also offer some protection
Features:
Its basicly a Digisound/Cem Datasheet based design, totally standard:
Coarse/Fine
XFM/LFM
PWM manual and cv-able
Hardsync +/-
UPDATE
Since this is just a little Through hole board with pretty stock features and im not fond of doing the buisness side of things, this project will be based upon donations with free gerbers on github. Ill just take some time for testing and updating resistor values as I want to make sure that its working and enjoyable for evryone.
........
During the last weeks I'VE invested quite some time in making a board for the CEM3340. Its basicly the Datasheet design + a Waveshaper much like the Digisound VCO. Rev G Chips seem to have no issue with the lower voltage. So far the resulting sound is very pleasing and thick.
Ill fitted all on a packed PCB ( 100x50mm 2 Layer) board. Really stuffed but it has no noise isues and there are big ground planes on both sides. Possibly planning a adapter PCB once I have decided on a layout, so far it is a wiring project
I will provide more detail in the coming days, especially Sounds if someone is really interested in this.
Panel is my prototyping panel. Upcoming DXF and 3D for professional engraved panel
. I just want to setup things properly. I will upload them in a day or two. Just wanted to know, if there is interest. Otherwise not worth the effort as one the one hand I dont want to get commercial with these thingy and on the other hand (coincidently) similar projects seem to arise.
but it does mean interest is spread pretty thinly.
. Perhaps I am an attention seeking whore. I am happy that you are all producing such cool stuff. I will upload my gerbers tommorow as I am to tired today and will double check. Then I will send it to the fabhouse and present results.
