| interested in a PCB or 4? |
| yep |
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98% |
[ 151 ] |
| nope |
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1% |
[ 2 ] |
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| Total Votes : 153 |
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toppobrillo
Joined: Dec 10, 2005
Posts: 766
Location: oakland, ca
G2 patch files: 1
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 Posted: Wed Jan 30, 2008 7:50 pm Post subject:
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| Quote: | There's one other thing I was wondering about with this module, and I was hoping you will know; Does this circuit function as a (voltage controlled) rise/fall lag generator in addition to being a A/D-A/D/S ?
For instance, if it's set for trigger mode, and you input a CV instead of a trig..
Or, no?
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no, the trigger input acts as a comparator- you can trigger the generator with pretty much any signal that exceeds it's threshold- it doesn't have to be pulse-like necessarily. |
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andrewF
Joined: Dec 29, 2006
Posts: 1176
Location: australia
Audio files: 4
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| Posted: Wed Jan 30, 2008 10:30 pm Post subject:
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| topp wrote: | ok well i was waiting for something from Mosc/Buchla before checking back in here- haven't heard anything so i decided to contact Buchla myself via phone- and he gives it the go-ahead.
josh |
Great to hear, Josh!
Did Mr Buchla want a board for himself? |
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bubblechamber
Joined: Nov 04, 2006
Posts: 280
Location: NYC
Audio files: 1
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| Posted: Wed Jan 30, 2008 11:02 pm Post subject:
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| fantastic |
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toppobrillo
Joined: Dec 10, 2005
Posts: 766
Location: oakland, ca
G2 patch files: 1
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| Posted: Thu Jan 31, 2008 2:08 am Post subject:
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here are a few oscilloscope shots of the FGs to illustrate their operation sorry i didnt post these up sooner
| Description: |
| 2 functions combined at the peak output |
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| Filesize: |
125.6 KB |
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12042 Time(s) |
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| Description: |
| quadrature mode illustrated here with both slopes of both functions nearly even |
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| Filesize: |
130.02 KB |
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12042 Time(s) |
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| Description: |
| quadrature mode illustrated here with function"B" in cycle mode |
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| Filesize: |
129.52 KB |
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12042 Time(s) |
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| Description: |
| rising slope of function "B" modulated by "A" |
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| Filesize: |
134.78 KB |
| Viewed: |
12042 Time(s) |
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Coriolis
Joined: Apr 11, 2005
Posts: 616
Location: Stilling, Denmark
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| Posted: Thu Jan 31, 2008 3:15 am Post subject:
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Great news!
I couldn't imagine Buchla feeling threatened by this initiative, but there was a chance that I's be wrong, so it's great that he was consulted.
Looking forward to this project.
C
Edit: Oohlala! Nice pics - looks like powerful stuff... |
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toppobrillo
Joined: Dec 10, 2005
Posts: 766
Location: oakland, ca
G2 patch files: 1
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norman phay
Joined: Jun 29, 2007
Posts: 176
Location: North-East England
Audio files: 1
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| Posted: Thu Jan 31, 2008 5:49 am Post subject:
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| topp wrote: | ok well i was waiting for something from Mosc/Buchla before checking back in here- haven't heard anything so i decided to contact Buchla myself via phone- and he gives it the go-ahead.
i was pretty (understatement?) nervous on the phone with the guy, but i explained as much as i could about this whole deal and the forum and all and told him that Mosc (who he seemed to remember) had emailed, so perhaps now he'll get an email reply. |
WAU, excellent news, man. I gotta admit, it it'd have been me in your position, I'd probably just dropped the project cause I'd have been waaay too scared to phone the guy under similar circumstances, so well done! |
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RF
Joined: Mar 23, 2007
Posts: 1502
Location: Northern Minnesota, USA
Audio files: 28
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| Posted: Thu Jan 31, 2008 7:55 am Post subject:
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| Thanks for the 'scope shots! Very cool stuff! |
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Photon
Joined: Mar 22, 2005
Posts: 363
Location: Boston
Audio files: 1
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| Posted: Thu Jan 31, 2008 8:40 am Post subject:
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| topp wrote: | | so i decided to contact Buchla myself via phone |
"Nature rewards courage"- Terence Mckenna
Greats news, Josh! Those scope shots are really enticing. I can't wait to sink my teeth into this one. Thanks again for the initiative.
Peter |
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mosc
Site Admin
Joined: Jan 31, 2003
Posts: 18274
Location: Durham, NC
Audio files: 232
G2 patch files: 60
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| Posted: Thu Jan 31, 2008 8:27 pm Post subject:
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| topp wrote: | \ i decided to contact Buchla myself via phone- and he gives it the go-ahead.
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Splendid!!! 
It's always important to keep everyone in the loop. Now maybe Don will check out the forum and join. 
_________________
--Howard
my music and other stuff |
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a.b.o.z.
Joined: Feb 07, 2007
Posts: 351
Location: Zagreb, Croatia
Audio files: 7
G2 patch files: 4
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| Posted: Fri Feb 01, 2008 6:32 am Post subject:
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| those are single sided pcbs, right? |
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BananaPlug
Joined: Jul 04, 2007
Posts: 307
Location: Philly
Audio files: 5
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| Posted: Fri Feb 01, 2008 8:22 am Post subject:
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| Looking at those scope shots, I'm not sure i fully grok what "quadrature mode" means in this context. The one with B in cycle mode makes it looks like A gates B on during the attack phase but that doesn't really explain the other image. What is the actual definition for quadrature as it applies to this module? |
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synthi
Joined: Jul 20, 2007
Posts: 29
Location: Spain
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Posted: Fri Feb 01, 2008 5:56 pm Post subject:
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Great!
I`m in for 4 boards!
Synthi |
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toppobrillo
Joined: Dec 10, 2005
Posts: 766
Location: oakland, ca
G2 patch files: 1
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| Posted: Fri Feb 01, 2008 6:57 pm Post subject:
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| Quote: | Great to hear, Josh!
Did Mr Buchla want a board for himself? |
hah well he didn't ask for one. im sure he's got plenty of things to keep him busy- i wish i had the balls to just ask him for a job! as apparently mosc did back in the day.. maybe soooommmmeeeeday. i actually work just a couple miles down the road from them for a company that makes equipment that i find for the most part to be really dull- but i guess i'm fortunate enough to not have to flip burgers or deliver pizzas..(not that those don't have their perks- nothing to eat here except potato chips out of the snack machine) the job market here is the best i've ever seen in my limited adult experience.
| Quote: | | WAU, excellent news, man. I gotta admit, it it'd have been me in your position, I'd probably just dropped the project cause I'd have been waaay too scared to phone the guy under similar circumstances, so well done! |
thanks no i wasn't really scared to ask permission, like i said before it didn't really occur to me to do it but i have alot of respect for the guy and out of respect to the others here who undoubtedly share that sentiment it was the thing to do after all. i was just real nervous calling at all about anything. he's kind of a legendary dude you know..
| Quote: | | those are single sided pcbs, right? |
yeah, and the only reason is that i had originally done the PCB in illustrator for press n peel. so i just worked off of that. but i have to say it has improved a bit! and of course single-sided boards are a great deal cheaper- but it was a pain to go in and change all the pads on all the components to make them big enough to solder on a single sided. next project will definitely be double-sided with plated through-holes. it's a heck of alot easier to design that way- maybe not quite as easy to rework.
| Quote: | | Looking at those scope shots, I'm not sure i fully grok what "quadrature mode" means in this context. The one with B in cycle mode makes it looks like A gates B on during the attack phase but that doesn't really explain the other image. What is the actual definition for quadrature as it applies to this module? |
in effect yes- ok if you look at the first picture you see that A rises and once it reaches 10V, B begins it's attack- A is held at 10V until B gets there, then is allowed to enter the decay phase- B is held at 10V until A's decay is through- then is allowed to decay itself. this picture is to illustrate this relationship as plainly as possible. the overall time of the 2 FGs is trimmed nearly equally and ATT and DEC controls are all set to minimum. A is in cycle mode, but with the controls being set as they are here, it doesn't matter what mode B is in.
the 2nd pic is to illustrate what happens when B is in cycle mode with ATT and DEC are at minimum and A's ATT and DEC times are much longer- A doesn't appear to be held up at all because B's attack time is so fast. a relationship more like what you see in the 1st pic will occur if B is not cycling- it will look more like a trapezoid. so B is allowed to retrigger itself in the interim- if there is opportunity for that to occur. i hope this makes a little sense!
since you have independent control of all slopes, you're able to manipulate the way this works quite a bit. if you want to maintain the relationship in the first pic over a wide frequency range, you can control all slopes with the same control voltage.
by the way, trimmed for minimum attack/decay times of 1mS no CV, a -5V CV input can reduce this time to about 200uS each, which in cycle mode means about 2500Hz.
josh |
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Fernando
Joined: Dec 30, 2006
Posts: 286
Location: Barcelona & Emporda, Spain
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| Posted: Sat Feb 02, 2008 7:32 am Post subject:
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| topp wrote: | | here are a few oscilloscope shots of the FGs to illustrate their operation sorry i didnt post these up sooner |
veeeeery cool  |
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jksuperstar
Joined: Aug 20, 2004
Posts: 2503
Location: Denver
Audio files: 1
G2 patch files: 18
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| Posted: Sun Feb 03, 2008 12:27 am Post subject:
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If there happens to be one or two more in the reserve, I'd take two of these boards  |
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BananaPlug
Joined: Jul 04, 2007
Posts: 307
Location: Philly
Audio files: 5
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| Posted: Mon Feb 04, 2008 1:34 pm Post subject:
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I've PM'ed about this twice and not heard anything back so I just want to go on record here in public-space that I'd like 4 boards. My first PM was around 1/29 I think.
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BananaPlug
Joined: Jul 04, 2007
Posts: 307
Location: Philly
Audio files: 5
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toppobrillo
Joined: Dec 10, 2005
Posts: 766
Location: oakland, ca
G2 patch files: 1
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| Posted: Mon Feb 04, 2008 4:44 pm Post subject:
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hey there sorry man- i did have the first PM and wrote down your order of 4. i guess i missed you as i was replying/confirming those anyway, all good!
josh |
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bugfight
Joined: Aug 02, 2007
Posts: 188
Location: Arlington, TX USA
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| Posted: Mon Feb 04, 2008 5:25 pm Post subject:
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| topp wrote: | hey there sorry man- i did have the first PM and wrote down your order of 4. i guess i missed you as i was replying/confirming those anyway, all good!
josh |
i also received no confirmation, thus the question earlier about confirming... |
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toppobrillo
Joined: Dec 10, 2005
Posts: 766
Location: oakland, ca
G2 patch files: 1
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| Posted: Mon Feb 04, 2008 6:02 pm Post subject:
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heya
layout looks good- the 2 sets of knobs are awful close together for my tastes and the knobs i use though. i ended up putting 2 behind a 3W frac panel because i couldn't fit everything comfortably in a 2W. it will be interesting to see how people will mount these in panels.
it is high time for the BOM and a decent mechanical drawing to post- apologies for not getting those up sooner, but as i said, you should have plenty of time to order parts before the boards get to you.
oh and if anyone else has any keen ideas on layouts for popular formats, please post them up as to inspire other not-so-mechanically inclined/experienced builders- runs of nice panels would be really cool, maybe not schaeffer-nice, but silk-screened perhaps.
if anyone needs to organize any group buys for parts for any reason feel free to post that request in this thread- as it will evolve into a build thread as these are put together/tested/used [if it's ok with the moderation team]
cool then, until then-
josh
Last edited by toppobrillo on Mon Feb 04, 2008 6:06 pm; edited 1 time in total |
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toppobrillo
Joined: Dec 10, 2005
Posts: 766
Location: oakland, ca
G2 patch files: 1
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| Posted: Mon Feb 04, 2008 6:05 pm Post subject:
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| Quote: | i also received no confirmation, thus the question earlier about confirming...
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i got it no worries |
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bugfight
Joined: Aug 02, 2007
Posts: 188
Location: Arlington, TX USA
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| Posted: Mon Feb 04, 2008 8:40 pm Post subject:
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| topp wrote: | | i got it no worries |
what? me worry?
heh, thanks. |
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neandrewthal
Joined: May 11, 2007
Posts: 672
Location: Canada
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| Posted: Mon Feb 04, 2008 11:49 pm Post subject:
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How Important is the "B level" pot? I don't have any room for it on the MOTM format panel I'm designing.
_________________
" I went through quite a few trannies til I found one I liked" - Wild Zebra |
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toppobrillo
Joined: Dec 10, 2005
Posts: 766
Location: oakland, ca
G2 patch files: 1
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| Posted: Tue Feb 05, 2008 1:26 am Post subject:
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i think it's pretty important as used here to combine the 2 functions into one, essentially. i guess you could just instead place an input jack and use an external mixer/vca or whatever to control the amount of anything that goes into it. on the prototype i built i have an external input [no attenuator] as well as the B level pot.
josh |
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