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simmeau
Joined: Nov 29, 2008
Posts: 32
Location: Brisbane
Audio files: 1
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 Posted: Mon Dec 22, 2008 6:29 pm Post subject:
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I'm doing a dual of this and I just got the first one up and running today. I used an ordinary 2k in place of the tempco (probably put them in later). I did little resistor teepees in series for the odd values. Was this necessary or could I just have used closest within 5% for everything except the 121k?. It took a long time. Anyway, it sounds great. Thanks for the project Andy  |
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funkyfarm
Joined: Jan 21, 2007
Posts: 583
Location: France
Audio files: 3
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| Posted: Mon Dec 22, 2008 9:45 pm Post subject:
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| simmeau wrote: | | I used an ordinary 2k in place of the tempco (probably put them in later). |
Good news !
You mean you will put 2K tempco after ?
There is no resistor value to tweak for tracking V/OCT scale ?
It seems 1.87k tempco is about to be obsolete... |
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simmeau
Joined: Nov 29, 2008
Posts: 32
Location: Brisbane
Audio files: 1
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| Posted: Mon Dec 22, 2008 11:28 pm Post subject:
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Actually i haven't trimmed it yet  I will do it tomorrow and see how it goes. I don't mind the flaky so hopefully it will be OK for my bedroom noodlings. |
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ericcoleridge
Joined: Jan 16, 2007
Posts: 889
Location: NYC
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| Posted: Tue Dec 23, 2008 1:39 am Post subject:
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| funkyfarm wrote: |
It seems 1.87k tempco is about to be obsolete... |
It seems the 1.87K Tempco Resistor can be ordered, custom, from Precision Resistor Company. This is where Ray Wilson gets his 1k and 2k Tempcos. I don't know what the price or minimum order amount is(could be 10), but, it's probably worth looking into if there's enough interest here on the forum. This 1K87 is not only used in the Oddy VCO, but also in the Arp 4023 VCF that Andy posted (and maybe the 4035 also?). Depending on price, I'd want at least 5. |
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etaoin
Joined: Jun 30, 2005
Posts: 761
Location: Utrecht, NL
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| Posted: Tue Dec 23, 2008 1:45 am Post subject:
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There's also half of an idea of a group buy on the sdiy list. So don't start two...
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http://www.casia.org/modular/ |
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Broadwave
Joined: Feb 16, 2007
Posts: 347
Location: Manchester UK
Audio files: 6
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| Posted: Tue Dec 23, 2008 2:08 am Post subject:
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| funkyfarm wrote: |
There is no resistor value to tweak for tracking V/OCT scale ?
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I've recently used 2K Tempco's with no problems - there's a 100k trimmer onboard to adjust the V/Oct scaling. Just enough tolerance to allow for a 2K.
Andy.
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Kronos 2-88, Kronos 61, Studiologic Sledge V2/SL, Broadwave ARP 2600EX, Broadwave 18U ARP based Eurorack Modular, Broadwave Minimoog Clone, GEM S2 Turbo.
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simmeau
Joined: Nov 29, 2008
Posts: 32
Location: Brisbane
Audio files: 1
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| Posted: Tue Dec 23, 2008 3:11 am Post subject:
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| There's been a bit of tempco discussion on this thread and I'm a bit curious about it on a practical level. I'm not using them on my diy masterpiece thus far (mostly due to cost). If you don't have them the scaling gets stuffed up as the temperature rises, correct ? In a VCO circuit like this one does the temperature reach a peak after a certain time or does it fluctuate? So far I have waited about 15 minutes warm up time before trimming the scaling. Is this a decent strategy? It sounds ok to me but I have a dream where I show it to someone who knows things and they hear the scaling and I get slapped in the face with a calf skin glove. |
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Broadwave
Joined: Feb 16, 2007
Posts: 347
Location: Manchester UK
Audio files: 6
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| Posted: Tue Dec 23, 2008 3:58 am Post subject:
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| simmeau wrote: | | So far I have waited about 15 minutes warm up time before trimming the scaling. Is this a decent strategy? |
Yes, I usually let things warm up for about 30 mins before any adjustments.
It also helps if the modules are adjusted in situ i.e. in the case where they'll eventually go as heat generated from the other modules, PSU etc can be higher than the ambient room temperature that you're working in.
Cheers,
Andy.
_________________
Kronos 2-88, Kronos 61, Studiologic Sledge V2/SL, Broadwave ARP 2600EX, Broadwave 18U ARP based Eurorack Modular, Broadwave Minimoog Clone, GEM S2 Turbo.
Synth DIY Projects
Musical Doodlings |
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simmeau
Joined: Nov 29, 2008
Posts: 32
Location: Brisbane
Audio files: 1
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| Posted: Thu Dec 25, 2008 7:53 am Post subject:
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| I replaced the 2k with 1.87k metal and tuned it. I got giddy when I heard the sound. I put on my duck-egg blue terry towelling bodysuit and and danced around for hours only pausing to photograph myself with my mobile phone and twitter how I was feeling with each passing second. Anyway, I will probably do another pair of these. |
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Broadwave
Joined: Feb 16, 2007
Posts: 347
Location: Manchester UK
Audio files: 6
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| Posted: Fri Dec 26, 2008 2:10 am Post subject:
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| simmeau wrote: | | I put on my duck-egg blue terry towelling bodysuit and and danced around for hours only pausing to photograph myself with my mobile phone and twitter how I was feeling with each passing second. |
Ahh, welcome to my world... you can't beat a good "Priscilla" moment when something works out well LOL!
Merry Christmas & a Happy New Year to all.
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Kronos 2-88, Kronos 61, Studiologic Sledge V2/SL, Broadwave ARP 2600EX, Broadwave 18U ARP based Eurorack Modular, Broadwave Minimoog Clone, GEM S2 Turbo.
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Musical Doodlings |
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Uncle Krunkus
Moderator
Joined: Jul 11, 2005
Posts: 4761
Location: Sydney, Australia
Audio files: 52
G2 patch files: 1
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| Posted: Fri Dec 26, 2008 5:53 am Post subject:
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Hey Simmeau,
Where's the video? 
I think that even rhymes! 
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What makes a space ours, is what we put there, and what we do there. |
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simmeau
Joined: Nov 29, 2008
Posts: 32
Location: Brisbane
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funkyfarm
Joined: Jan 21, 2007
Posts: 583
Location: France
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ericcoleridge
Joined: Jan 16, 2007
Posts: 889
Location: NYC
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| Posted: Sat Dec 27, 2008 1:30 pm Post subject:
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I also noticed that the PCB was slightly less than 100% scale-- but only after I etched it! I think it will be OK, however. I'm populating it anyway.
Can you confirm this Andy? |
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numbertalk
Joined: May 05, 2008
Posts: 992
Location: Austin, TX
Audio files: 5
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| Posted: Sun Dec 28, 2008 4:27 pm Post subject:
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| Damn I already etched mine too. Hopefully won't be too tough to kloodge the IC sockets in. |
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ericcoleridge
Joined: Jan 16, 2007
Posts: 889
Location: NYC
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| Posted: Sun Dec 28, 2008 5:58 pm Post subject:
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| numbertalk wrote: | | Damn I already etched mine too. Hopefully won't be too tough to kloodge the IC sockets in. |
I was able to squeeze mine into the layout, but it definitely appeared to be a little scaled down. |
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drapdap
Joined: Oct 11, 2004
Posts: 204
Location: London
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| Posted: Mon Dec 29, 2008 2:16 am Post subject:
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| funkyfarm wrote: |
It seems it's bit out of scale, and some security stuff prevent me from openning it in photoshop...
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That's just a password. Try some PDF-password remover, it'll work.
r. |
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blue hell
Site Admin
Joined: Apr 03, 2004
Posts: 24423
Location: The Netherlands, Enschede
Audio files: 297
G2 patch files: 320
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| Posted: Mon Dec 29, 2008 4:15 am Post subject:
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| drapdap wrote: | | That's just a password. Try some PDF-password remover, it'll work. |
Or alternatively ... when you want a "toolbox" like solution for windows without concerns about spy/add-ware ...
Install Ghostscript, install the Gimp, set the GS_PROG environment variable to point to your ghostscript exe. Then install a postscript printer, any printer will do you don't need to actually have that printer, and use that that printer to print the PDF to a file with a .ps extension, it will be a postscript file then. Next thing is to open the .ps in Gimp, and then you can do anything you like to the images.
It is a bit more work of course ...
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Jan
also .. could someone please turn down the thermostat a bit.
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etaoin
Joined: Jun 30, 2005
Posts: 761
Location: Utrecht, NL
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| Posted: Mon Dec 29, 2008 4:28 am Post subject:
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However, if the pdf just needs to be scaled up or down before printing, you can just do that in the print window of acrobat reader. No need to create a new file.
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Luka
Joined: Jun 29, 2007
Posts: 1003
Location: Melb.
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| Posted: Mon Dec 29, 2008 4:41 am Post subject:
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i usually print out of corel draw so i can layout a bunch of pcbs onto an a4 page. you can import pdf layouts easily and re-scale with no probs. when pcb images are out of scale i simply grab one i know is the correct scale (i usually use yusson's designs for this) and just make one transparent and stretch the poor scaled image to match the IC pin dimensions of the correct sized layout. pretty simple.
i think you can do this in inkscape too, though haven't used it for awhile
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problemchild
melbourne australia
http://cycleofproblems.blogspot.com/
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blue hell
Site Admin
Joined: Apr 03, 2004
Posts: 24423
Location: The Netherlands, Enschede
Audio files: 297
G2 patch files: 320
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| Posted: Mon Dec 29, 2008 4:59 am Post subject:
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| Luka wrote: | | i think you can do this in inkscape too, though haven't used it for awhile |
Just checked, it will read PDF indeed, didn't know that ... handy !!
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Jan
also .. could someone please turn down the thermostat a bit.
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urbanscallywag
Joined: Nov 30, 2007
Posts: 317
Location: sometimes
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| Posted: Mon Dec 29, 2008 9:28 pm Post subject:
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| Blue Hell wrote: | | drapdap wrote: | | That's just a password. Try some PDF-password remover, it'll work. |
Or alternatively ... when you want a "toolbox" like solution for windows without concerns about spy/add-ware ...
Install Ghostscript, install the Gimp, set the GS_PROG environment variable to point to your ghostscript exe. Then install a postscript printer, any printer will do you don't need to actually have that printer, and use that that printer to print the PDF to a file with a .ps extension, it will be a postscript file then. Next thing is to open the .ps in Gimp, and then you can do anything you like to the images.
It is a bit more work of course ... |
Windows Office Document Writer can do this too. I don't know if it only comes with Office or if its a Windows default. Anyhow you can print the PDF to .msi then double click the file and save it as a .tif. |
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Broadwave
Joined: Feb 16, 2007
Posts: 347
Location: Manchester UK
Audio files: 6
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| Posted: Tue Dec 30, 2008 7:02 am Post subject:
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| ericcoleridge wrote: | I also noticed that the PCB was slightly less than 100% scale-- but only after I etched it! I think it will be OK, however. I'm populating it anyway.
Can you confirm this Andy? |
I've not had a problem using the same PDF - Please remember not to select the Shrink (or Fit) to Page scaling option if you're using Acrobat - make sure you select page scaling as "None", as this will definitely reduce the image... maybe that's the problem?
Cheers,
Andy.
_________________
Kronos 2-88, Kronos 61, Studiologic Sledge V2/SL, Broadwave ARP 2600EX, Broadwave 18U ARP based Eurorack Modular, Broadwave Minimoog Clone, GEM S2 Turbo.
Synth DIY Projects
Musical Doodlings |
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funkyfarm
Joined: Jan 21, 2007
Posts: 583
Location: France
Audio files: 3
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| Posted: Tue Dec 30, 2008 8:19 am Post subject:
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Do I have to buy the schematic online in order to build this module ?
ff |
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etaoin
Joined: Jun 30, 2005
Posts: 761
Location: Utrecht, NL
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