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akrearke
Joined: Sep 08, 2008 Posts: 53 Location: US
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Posted: Wed Sep 16, 2009 12:20 pm Post subject:
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From what i understand the common voltage output is a sum voltage of the number of plates being touched. you could kludge in the individual touch voltage outs without a whole lot of effort or space. It wasn't until afterward that i noticed the problem in the oscillator driver. i do sincerely apologize for that error. before etching your programmer, wait until i post the new foil. It has the common pulse circuit it and the cv summers on their on board that have the capacity for 3 rows. |
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shawn
Joined: Dec 13, 2005 Posts: 209 Location: savannah
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Posted: Wed Sep 16, 2009 7:16 pm Post subject:
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Well I blew up T3 in the oscillator circuit so I gotta go through and see what short(s) I had. Damn piece hit me in the face! |
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ericcoleridge
Joined: Jan 16, 2007 Posts: 889 Location: NYC
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Posted: Wed Sep 16, 2009 8:01 pm Post subject:
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akrearke wrote: | From what i understand the common voltage output is a sum voltage of the number of plates being touched. you could kludge in the individual touch voltage outs without a whole lot of effort or space. |
I don't have the doc in front of me, but the way I remembered it was that the common out only ouput the hightest pressure voltage at current state, no matter how many heys were held down-- making it, IMO, a more ideal output. I can't see a use for 16 pressure outs (+16 note outs, etc). Frankly, I don't even want 16 note outs I don't, but I'll get to that when I get there... |
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akrearke
Joined: Sep 08, 2008 Posts: 53 Location: US
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Posted: Thu Sep 24, 2009 8:05 am Post subject:
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ok here are the re-worked layout files and everything else.
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akrearke
Joined: Sep 08, 2008 Posts: 53 Location: US
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Posted: Thu Sep 24, 2009 8:08 am Post subject:
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the touch plate foils included
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akrearke
Joined: Sep 08, 2008 Posts: 53 Location: US
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Posted: Thu Sep 24, 2009 8:20 am Post subject:
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ok the touch plate foil has to be 11" across and around 2" wide to get the plates about the right size. I can make these for those who are interested. just send me pm, or if there is enough interest then post the request or questions on the forum. I hope this thing works for everyone. i have gone over it three times in the past couple weeks so the layout should be good. BUT STILL DOUBLE CHECK! After awhile these things start to be like working a puzzle upside-down and backwards. I will post the Japanese buchla clone a little later. |
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akrearke
Joined: Sep 08, 2008 Posts: 53 Location: US
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Posted: Sat Sep 26, 2009 10:24 pm Post subject:
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here are eight note versions of the foils. and what i have noticed is that converting them back to he original bitmap files in paint increases the resolution.
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akrearke
Joined: Sep 08, 2008 Posts: 53 Location: US
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Posted: Sun Sep 27, 2009 2:00 pm Post subject:
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ok here are some photos of the all the stuff i have been working on. just so everyone know i am not full of it...
- the 112 style tkb redesigned.
- mark verbos' 258's, 291's, and 292's.
- 110 clone.
- serge vca.
- quad 281's.
- analog logic.
- Xfader.
more...
all just waiting for the cabinets to be built.
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Tasmanian Alkaloid
Joined: Jun 29, 2008 Posts: 116 Location: Isle De Mort
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Posted: Mon Sep 28, 2009 2:42 am Post subject:
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akrearke wrote: | ok here are some photos of the all the stuff i have been working on.
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the tkb looks awesome! I'd like to try building one.
Thanks for sharing the foils & for your work in bringing them here |
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shawn
Joined: Dec 13, 2005 Posts: 209 Location: savannah
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Posted: Wed Sep 30, 2009 1:04 pm Post subject:
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Found a labeling error. For the programmer portion of the layout, the resistor connected to the pin 6 of the rightmost IC is actually 330k and not 100k as listed on the layout.
Still looking at the programmer, the other portion of the layout contains a 150k in the upper left corner. It's missing the +12 connection that T4, 150k and 10k share.
I haven't finished the rest but this is what I found so far. |
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akrearke
Joined: Sep 08, 2008 Posts: 53 Location: US
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Posted: Wed Sep 30, 2009 5:52 pm Post subject:
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you are correct. just draw a trace from the 150k/10k junction to the uppermost trace and you have +voltage. as for the 330K resistor, you are also correct. easy fixes, but could have presented serious problems.
i hope everyone will post their own findings.
I downloaded some pcb layout software, we'll see what comes about in the future... |
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shawn
Joined: Dec 13, 2005 Posts: 209 Location: savannah
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Posted: Sat Oct 03, 2009 11:19 am Post subject:
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I just confirmed that the touch portion layout works from what I can tell. I built just one portion of the 8 switch foil set. Touch 1 is working but I haven't tested Touch 2 but since I confirmed that the layout is correct I don't see any issues with the other. I'm going to skip the programmer and build the cgs programmer instead but I'm excited. |
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ericcoleridge
Joined: Jan 16, 2007 Posts: 889 Location: NYC
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Posted: Sat Oct 03, 2009 12:25 pm Post subject:
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Would it be foolish for me to try and kluge my first version pcb? If not, any suggestions for what I should pay attention to on the old PCB layout, beyond what's already been pointed out? |
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shawn
Joined: Dec 13, 2005 Posts: 209 Location: savannah
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Posted: Sat Oct 03, 2009 5:32 pm Post subject:
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Well the touch portion from the latest revision is correct. I confirmed it's the same from the schematic and the Touch 1 switch should work fine. At least with the touch portion I don't think you would run into any issues. |
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ericcoleridge
Joined: Jan 16, 2007 Posts: 889 Location: NYC
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Posted: Sun Oct 04, 2009 12:39 pm Post subject:
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So, it was just the driver portion that had all the errors? I corrected a couple, but there must have been more. Perhaps, I'll just etch just etch a new daughter board for the Osc Driver. |
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akrearke
Joined: Sep 08, 2008 Posts: 53 Location: US
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Posted: Sat Dec 05, 2009 11:55 pm Post subject:
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Anybody had any luck with these yet? I'm getting ready to house all of my floating circuits, and will let everyone know what happens with the "112 style". If it works well, I'll post everything for that one too... |
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The Bad Producer
Joined: Mar 08, 2009 Posts: 282 Location: The Manhole
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Posted: Sun Dec 06, 2009 6:31 am Post subject:
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Not yet for me! I've never etched a board myself before, and wanted to do a few other things before attempting this - got most of the parts though! I was hoping to breadboard when I've got some time over the hols.
Thanks for sharing all the info akrearke...
Charlie _________________ http://loudestwarning.tumblr.com/ |
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davemoog
Joined: Feb 23, 2008 Posts: 52 Location: Vancouver
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Posted: Fri Dec 11, 2009 6:23 pm Post subject:
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Does anyone know how the Serge TKB derives the pressure voltage? |
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akrearke
Joined: Sep 08, 2008 Posts: 53 Location: US
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Posted: Sat Dec 12, 2009 9:16 am Post subject:
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there is a article in Synapse magazine mentioned in this thread that gives a good explanation. As far as a detailed circuit analysis, it would probably be best to look up some basic Op-Amp circuits and compare. Sorry I can't tell you more about it right now. When I have one built I will study it thoroughly and post my findings. |
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macumbista
Joined: Sep 12, 2007 Posts: 398 Location: berlin
Audio files: 3
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Posted: Tue Jan 12, 2010 4:24 pm Post subject:
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This looks great! Please keep us up to date on revisions etc. Still have plans to produce any boards? _________________ Esoteric drones and nonlinear distortion
Custom/handmade experimental instruments
macumbista.net |
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akrearke
Joined: Sep 08, 2008 Posts: 53 Location: US
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Posted: Sat Jul 10, 2010 3:30 pm Post subject:
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Okay. the japan tkb, never got it working. I built two prototypes found common direct replacement parts for the odd ones, still nothing. checked the schematic found on this thread against the Buchla, they are identical in operation, only part values differ. the Japan tkb uses germanium diodes, buchla uses silcon. I have a some of these black diodes left... as far as the transistors go i used PN versions of the buchla originals. Here is what happens. One LED lights, that is one at a time, so that latching and monophonic operation seems to be how it functions. There are two trimmers per note and these have to be calibrated precisely it seems. I have spent many hours twiddling these little pots and at best the led moves to latch another note. no pulse output, no cv output. any ideas?
Oh, if anyone who is reading this thread knows how to calibrate or the operation of the circuit let me know... |
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vtl5c3
Joined: Sep 08, 2006 Posts: 425 Location: PDX
Audio files: 13
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Posted: Sun Jul 11, 2010 10:38 am Post subject:
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I built an 8 stage copy of the Japanese keyboard too. It also doesn't work.
The oscillator works and IIRC the square wave reaches the touch keys, but nothing happens beyond that. I haven't spent a ton of time debugging it, but plan on going back to it when I finish my Haible Freq Shifter.
R. |
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akrearke
Joined: Sep 08, 2008 Posts: 53 Location: US
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Posted: Sun Jul 11, 2010 11:00 am Post subject:
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I am probably just going to scrap the one I built. I don't think it will work... sorry I am being a little pessimistic. There are realy too many things that can go wrong in a circuit this complex, and with no support from anyone more experienced, it may not be worth the time and effort. This is why I never posted the foil I did for it...
However, I am confident that the Synapse version will, and am going that route when the funds are available. I know that many have waited patiently to see how this turns out, and I will keep ya'll up to date...
In the mean time, do anyone have a mm74c140n they would be willing to part with. I do have a board for the current serge tkb and would like to test it.
It is my opinion here that a digitally controlled version with analog outputs would be more reliable and accurate... |
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TekniK
Joined: Aug 10, 2008 Posts: 1059
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Posted: Tue Jul 13, 2010 7:23 am Post subject:
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akrearke wrote: | In the mean time, do anyone have a mm74c140n they would be willing to part with. |
I did search some time ago for a source for this chip and its more as impossible to find.
I think your waste your time using this part.
STS have probably some spare... |
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zthee
Joined: Feb 20, 2008 Posts: 414 Location: Stockholm
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