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marvkaye
Joined: Mar 14, 2011 Posts: 225 Location: Fla
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Posted: Fri Jul 15, 2011 6:02 am Post subject:
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Scot Solida wrote: | marvkaye wrote: | Also, any chance you'd be willing to share a full size PDF of your panel, or at least a larger photo that would make seeing everything a bit easier? And where'd you get the panel itself??? Sorry for all the questions, but this is a big project and there's a ton more where these came from.
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<Marv> |
I uploaded the JPG I used to print the panel here:
http://www.theelectronicgarden.com/Scot/AppendageBigKnobs.jpg |
Very cool, Scott, thanks for sharing that. It's much appreciated.
<Marv> |
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marvkaye
Joined: Mar 14, 2011 Posts: 225 Location: Fla
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Posted: Sat Jul 16, 2011 12:53 pm Post subject:
Appendage components?? |
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I've started working my way through the Appendage BOM and have hit a snag. I'm pretty sure it won't be my last so I thought I would deal with them as they arise....
The capacitor list calls for a 2nF (2000pF) 1% 50v polypropylene cap and has a Digikey part number. It obviously worked back in '08 when the BOM was originally sourced, but this is a new day and things have changed. That Digikey part is obsolete, they don't appear to have a replacement, and I can't find anything comparable at Mouser. Mouser does have styrene 2nF 50v caps but with a 5% tolerance... any reason that wouldn't work, or do I need to keep searching for the tighter tolerance??? Anybody have another suggestion?
TIA...
___________
<Marv>
(edited awhile later to correct a typo) |
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emdot_ambient
Joined: Nov 22, 2009 Posts: 667 Location: Frederick, MD
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iopop3
Joined: May 28, 2010 Posts: 94 Location: Malmö, Sweden
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Posted: Wed Jul 27, 2011 3:08 pm Post subject:
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Polypropylene are called for on c50, c51 and c52 - all used on the LF398's capacitor input. The datasheet even mentions that NPO and COG ceramics exists and can be used.
It might be possible to use a 2.2nF. It will change the hold step which is defined as "The voltage step at the output of the sample and hold when switching from sample mode to hold mode with a steady (dc) analog input voltage." So, basically the curve when going from Sample to Hold will be a little bit different? A bit tired so I might have missed something fundamental here. |
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Cat-A-Tonic
Joined: Mar 24, 2008 Posts: 42 Location: Yokohama, Japan
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Posted: Sun Sep 18, 2011 12:57 am Post subject:
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Apologies if I have missed this information, but
Will a HotPot work in the place of a SoftPot?
If one has experience with both could they offer a preference?
HotPots claim to have a nicer texture.
Would it be advantageous to put a Force Sensing Resistor of equal dimensions beneath the Soft/Hot Pot for pressure CV out? |
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State Machine
Janitor
Joined: Apr 17, 2006 Posts: 2809 Location: New York
Audio files: 24
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Posted: Sun Sep 18, 2011 5:25 am Post subject:
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Quote: | Apologies if I have missed this information, but
Will a HotPot work in the place of a SoftPot?
If one has experience with both could they offer a preference?
HotPots claim to have a nicer texture.
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Yes, Scott even tested a Hot Pot I believe it was electrically comparable to the soft pot. The texture is different from what I remember, How it was different, I don't remember.
As far as a FSR under the Hotpot, hey why not. In fact you can even sum the two CV's in the MIX section of the Appendage or use the CV from the FSR independently to modulate volume for example. Just more possibilities.
Bill |
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wmonk
Joined: Sep 15, 2008 Posts: 528 Location: Enschede, the Netherlands
Audio files: 15
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Posted: Mon Oct 24, 2011 3:56 pm Post subject:
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I started building this beast
only 100 resistors done. So far so good. Anyway, will give some updates on my panel.
Bill, what does the midi mod add to a panel? _________________ Weblog! |
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iopop3
Joined: May 28, 2010 Posts: 94 Location: Malmö, Sweden
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Posted: Thu Nov 10, 2011 1:20 am Post subject:
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Stuffed most of the resistors, ICs and diodes. Still need to figure out what kind of case I should use. The board feels a bit too large to mount behind a panel. Right now it looks like I'm aiming at a stand alone instrument.
Noticed a tiny error in the build docs on page 111 (113). In the title for table 8-27 it say 330R instead of 220R. Certainly no show stopper.
Btw. regarding C50-C52, what do you reckon would happen if you use a 2.2nF polystyrene instead ? |
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State Machine
Janitor
Joined: Apr 17, 2006 Posts: 2809 Location: New York
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Posted: Thu Nov 10, 2011 4:30 pm Post subject:
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Quote: | Noticed a tiny error in the build docs on page 111 (113). In the title for table 8-27 it say 330R instead of 220R. Certainly no show stopper. |
Thanks !
Quote: | Btw. regarding C50-C52, what do you reckon would happen if you use a 2.2nF polystyrene instead ? |
These are the HOLD capacitors in the first stage of the three two stage S/H circuits. Timing is critical there. Ideally, I would adhere to the BOM and get whats called out otherwise performance may be affected. You probably would be OK to use the 2.2 nF poly. Try it if you have them. You can always change them. If you have to purchase anyways, I would get the 1% capacitors.
Bill |
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mark_olson
Joined: Oct 26, 2006 Posts: 177 Location: Lawrence, Kansas
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Posted: Sat Nov 12, 2011 10:54 am Post subject:
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State Machine wrote: | Quote: | Noticed a tiny error in the build docs on page 111 (113). In the title for table 8-27 it say 330R instead of 220R. Certainly no show stopper. |
Thanks ! |
Related to this, are what I believe are incorrect references to "R102" at Tables 8-21, 8-25 and 8-27 as well. Looks like a case of copy-and-paste-itis to me
Mark |
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State Machine
Janitor
Joined: Apr 17, 2006 Posts: 2809 Location: New York
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Posted: Sun Nov 13, 2011 10:53 am Post subject:
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Thanks guys, I will note these changes and post the latest document.
Hope the builds are going well !
Bill |
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State Machine
Janitor
Joined: Apr 17, 2006 Posts: 2809 Location: New York
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Posted: Sun Nov 13, 2011 11:37 am Post subject:
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OK, new doc posted :
Description:
BUILD & CALIBRATION DOCUMENT FOR REV "H" PCB'S
Download
Filename: Appendage_Build_Procedure_Issue_1_2_1_REV H PCB.pdf
Changes:
Table 8-21, 8-25, and 8-27
Here:
http://electro-music.com/forum/post-340402.html#340402
Thanks again !
Bill |
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Satindas
Joined: Mar 26, 2011 Posts: 42 Location: uk
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diablojoy
Joined: Sep 07, 2008 Posts: 809 Location: melbourne australia
Audio files: 11
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Posted: Mon Dec 05, 2011 4:39 pm Post subject:
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try googling
rush online capacitors
they have 2nf polystyrene
check for sizes that fit
also an f tolerance = 1%
0.49 GBP each
this is where i go for polystyrenes when i need them
never had a problem with them
also when soldering them in using an aligator clip as a heatsink is highly recommended as they are prone to damage from heat _________________ In an infinite universe one might very well
ask where the hell am I
oh yeah thats right the land of OZ
as good an answer as any |
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State Machine
Janitor
Joined: Apr 17, 2006 Posts: 2809 Location: New York
Audio files: 24
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Posted: Mon Dec 05, 2011 4:43 pm Post subject:
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Quote: | Any reason not to use micas ????
Maybe these |
Sure, that will work.
Bill |
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Benjamin AM
Joined: Nov 04, 2010 Posts: 83 Location: Boise
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Posted: Sat Feb 04, 2012 11:15 am Post subject:
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This build is a a few back in my queue of projects, but it seems to be the one that I tend to think about the most. Does anyone have video of their working Appendage? I've watched Scott's videos(which are great) several times over and I am curious how others use this thing. Thanks. |
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State Machine
Janitor
Joined: Apr 17, 2006 Posts: 2809 Location: New York
Audio files: 24
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Posted: Sun Feb 05, 2012 7:46 am Post subject:
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Quote: |
Posted: Yesterday, at 11:15 am Post subject:
This build is a a few back in my queue of projects, but it seems to be the one that I tend to think about the most. Does anyone have video of their working Appendage? I've watched Scott's videos(which are great) several times over and I am curious how others use this thing. Thanks.
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Not many videos consider how many I have sold but here is one controlling some Blacet modular gear. He makes use of BEND and TFS and is using one of the GATED modes of operation.
http://www.youtube.com/watch?v=ATK2MxrIWlo&feature=youtube_gdata_player
Bill |
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Scot Solida
Joined: Oct 24, 2009 Posts: 100 Location: Hutchinson Kansas
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Posted: Sun Feb 05, 2012 7:55 am Post subject:
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Unfortunately, I never got into making videos. I finished my Appendage yonks ago and played it live at last Summer's KCEM festival. I use it a lot, but simply never filmed anything like that. I'm certain I am a crap videographer. In practical use, I use it to control all manner of things. I particularly like it for controlling LFO or sequencer rates and delay time/feedback on a delay module. But really, anything is fair game!
Mind you, I pretty much got my first play of the thing when Scott came over and hooked his up to my big modular and then again when he helped with calibration of my own (I say "helped", but I was hopeless with the calibration. Fortunately he was not, though my Appendage gave him a bit of grief!)
With that in mind, I don't really use it any differently than he does in those videos! |
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unterbit
Joined: Dec 08, 2008 Posts: 30 Location: Russia.St Petersburg
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Posted: Fri Apr 20, 2012 2:29 pm Post subject:
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Hi guys!Almost done!My near third serious project,no need to say how it was difficult ,here in Leningrad find out those components..but thankfully online shops all is picked up and populated! I came with 500cm Spectrasymbol,the standoff I done is masterpiece.THE CALIBRATION.
If you thinking that there is something wrong you are absolutely right,so let's not pigeonhole and c'mon get close to my trouble!
I believe that all components stuffed correctly,same for caps,ic,etc.doublecheck
Step1. It's O.K. 1.5v I/V respectably
Step2. Trimming from0.009v I came to pos.rail at 13.7v with Gate led starting flashing,and after excessive turning couldn't come to reasonable response(specialy at low end of ribbon)moreover WITHOUT pressure applied the led is still tends to lit,and goes off only at extreme turning VR1.
Step3.5 no problem here -4.5v done
Step3.7oops..reads neg.-1.5v and all I could get is 0.v,no pos.voltage
Step3.9 VM reads -0.006v and VR2 can't do nothing..(it seems no effect from turning) so no pos.v is achieved .
I took measure at pin 10 of U13 it shows+4v(no pressure applied to rib)the same with disconnected ribbon.So little frustrated I stopped at this point waiting your healing tip. |
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unterbit
Joined: Dec 08, 2008 Posts: 30 Location: Russia.St Petersburg
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Posted: Mon Apr 23, 2012 4:12 pm Post subject:
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the leds lit still.... |
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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: Mon Apr 23, 2012 6:19 pm Post subject:
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Your problem at Step2 sounds suspiciously like a problem I had when I was calibrating the prototype. (Not getting a definite on state, and then not able to get the led to turn off.)
In that case it actually turned out to be a dodgy softpot. Bill sent me another one, and it all worked perfectly. We ended up thinking it was because when he first sent them out, he kind of folded them up (gently, but even then).
Now I think he coils them into a loop around a former when he ships them.
Do you have a second softpot you could try? Did they "fold" them when they sent you this one? _________________ What makes a space ours, is what we put there, and what we do there. |
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Uncle Krunkus
Moderator
Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
Audio files: 52
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Posted: Mon Apr 23, 2012 6:22 pm Post subject:
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BTW,
I still have the one which doesn't work. You can see a definite "dent" in the outside plastic layer, which I think has made an intermittant connection, or altered the overall capacitance of the pot. _________________ What makes a space ours, is what we put there, and what we do there. |
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unterbit
Joined: Dec 08, 2008 Posts: 30 Location: Russia.St Petersburg
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Posted: Mon Apr 23, 2012 7:40 pm Post subject:
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Quote: | BTW,
I still have the one which doesn't work. You can see a definite "dent" in the outside plastic layer, which I think has made an intermittant connection, or altered the overall capacitance of the pot |
I am afraid my is just perfect.No dents observing,came in round big coil.nevertheless tends to work as intended only at up range of.btw,if I change polarity ring vs sl. working area is interpolating to the low end.And voltage at pin10 of U13,(as I heard,should be 0v,with no pressure to the ribb.) my shows 4v.maybe I am wrong but Scot Stites mentioned that. |
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unterbit
Joined: Dec 08, 2008 Posts: 30 Location: Russia.St Petersburg
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Uncle Krunkus
Moderator
Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
Audio files: 52
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Posted: Wed May 02, 2012 6:54 am Post subject:
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Looks very cool! _________________ What makes a space ours, is what we put there, and what we do there. |
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