So I made a little build document for the edelweiss panel. Original thread: viewtopic.php?t=94479&start=all&postday ... torder=asc
I can confirm that the build doc seems to be correct, at least one person has built their panel using it, I'm about 75% done with mine and so far it has been holding up. If you have suggestions how to improve it you can post your findings in this thread.
Edelweiss - Build thread
Edelweiss - Build thread
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- Edelweiss build document v 1.1.pdf
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Last edited by Jonachi on Thu Oct 23, 2014 11:53 am, edited 6 times in total.
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Great work 
Maybe a lunchmeeting on tuesday?
Maybe a lunchmeeting on tuesday?
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https://soundcloud.com/going-north-home
https://soundcloud.com/going-north-home
Hey, that's a surprise! Looks great! I like the Emerson (lighter) blue as well but never managed to come across the (old?) dark blue ones - mind sharing the source/manufacturer? There've been extensive discussions as to where the jacks originate ...modintx wrote:Thanks Jonachi - I finally found nice dark blue jacks
Sure these are from a company in California called E-Z-Hook. They have posts so you have to wind the hook-up wire around and solder - no problem, just different from the usual thru hole arrangement. These are't the same as STS but the color is very very close.
Price break at Qty 250 down to $.87 by the way.
http://catalog.e-z-hook.com/item/connec ... posts/9284?
Price break at Qty 250 down to $.87 by the way.
http://catalog.e-z-hook.com/item/connec ... posts/9284?
Started my build today, populated the Noise PCB. Want to try it out with euro jacks before I use it for the panel. Got a little confused by this:
So first build question: Is the 100k* used or not for edelweiss?
The resistor marked 100k* on the PCB is not needed unless you are experimenting with isolating the S&H from the noise circuit. If a resistor is inserted between the S&HT pads, the resistor in the 100k* forms the lower leg of a voltage divider with it. The pair of resistors can then be used to adjust the range of the voltages being fed into the S&H.
So first build question: Is the 100k* used or not for edelweiss?
^^^Good question. I checked the electro-music CGS forum and I don't see anyone who's built this combo of CGS92+97 just yet. Maybe best answered by Ken Stone.
My assumption right now is we DO NOT need it as we do NOT want it isolated as we require full functionality. Happy to be corrected.
After marking up the back of the panel ready for hook up wire, I started populating my Pulse divider / Logic PCB today...
Enjoy your build!
My assumption right now is we DO NOT need it as we do NOT want it isolated as we require full functionality. Happy to be corrected.
After marking up the back of the panel ready for hook up wire, I started populating my Pulse divider / Logic PCB today...
Enjoy your build!
Last edited by modintx on Tue Apr 08, 2014 9:02 am, edited 1 time in total.
I also finished the Noise, upper part (noise) looks good, the S&H section seems to require the "X" trace cut that Ken describes in the Setup part on his page. Haven't done that yet as I want to try out other transistors as noise source - maybe the different level changes the behavior of the S&H part. If the S&H is separated this way (and C connected to the S&H pad) my guess is that only tweaking the RPD resistor is necessary (without installing the 100K*), but this is just a guess.
Did you guys get the S&H section to work (to your satisfaction)?
In general I'll try to get the Noise source side of the Random Source fully working, then get at least one SSG (or both) fully working before hooking up one SSG as a RVG.
I've pretty much stuffed all the modules, but wired only the DUSG and CGS81 so far. Pro-tip: when building the DUSG, make sure you connect all the straight lines marked on the pcb with a lead...
Did you guys get the S&H section to work (to your satisfaction)?
In general I'll try to get the Noise source side of the Random Source fully working, then get at least one SSG (or both) fully working before hooking up one SSG as a RVG.
I've pretty much stuffed all the modules, but wired only the DUSG and CGS81 so far. Pro-tip: when building the DUSG, make sure you connect all the straight lines marked on the pcb with a lead...
Thanks nordlead, I'm due to stuff my DUSG's this weekend so good timing on the tips 
Have not got to noise yet as I am missing the PN4250 from Ken. I'll get one when I order the PCB's for LaBestia etc - if you find alternative one that you like please do let us know.
Progress so far - CGS89 and CGS36 Stuffed and mounted (sounds like a safari hunt) - will do hookup wire and test this weekend as well.
Have not got to noise yet as I am missing the PN4250 from Ken. I'll get one when I order the PCB's for LaBestia etc - if you find alternative one that you like please do let us know.
Progress so far - CGS89 and CGS36 Stuffed and mounted (sounds like a safari hunt) - will do hookup wire and test this weekend as well.
You should be able to use the PN4250A as well:
http://www.mouser.com/ProductDetail/Cen ... lj3XHEg%3d
I've used these in some Serge circuits before.
http://www.mouser.com/ProductDetail/Cen ... lj3XHEg%3d
I've used these in some Serge circuits before.
Are you lemon? Does your head come to a nub?
Thanks J3RK, interesting as that part indicates low noise, not sure if that what we're after in this application? 
From Ken's Site:
From Ken's Site:
If you are sourcing your own parts, it is best to install a socket for the 2N4250 transistor marked N (for noise). You will need to try multiple devices to find one that is sufficiently noisy. Boards purchased from me will include a hand-selected PN4250 which can be installed with no further testing, in reverse to the D symbol on the PCB.
Ahh, I kind of misread your post. I thought it was for the DUSG. Yeah, you probably want something more general purpose. These ones would probably still produce white noise, but possibly not as well perhaps. My white noise generator uses an NPN, so I haven't selected PNPs for noise before. (so no good recommendations really) I do find that the other Serge-favorite, the 5089 produces excellent white noise in an NPN based design.
Are you lemon? Does your head come to a nub?
Mine seems to work right away. Tried it out with my Eurorack and the s/h seems to work just as intended. The white noise was a tad bit lower than the doepfer noise module I compared it to but otherwise fine.nordlead wrote:I also finished the Noise, upper part (noise) looks good, the S&H section seems to require the "X" trace cut that Ken describes in the Setup part on his page. Haven't done that yet as I want to try out other transistors as noise source - maybe the different level changes the behavior of the S&H part. If the S&H is separated this way (and C connected to the S&H pad) my guess is that only tweaking the RPD resistor is necessary (without installing the 100K*), but this is just a guess.
Did you guys get the S&H section to work (to your satisfaction)?
In general I'll try to get the Noise source side of the Random Source fully working, then get at least one SSG (or both) fully working before hooking up one SSG as a RVG.
