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arumblack
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Posts posted by arumblack
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MB SEQ can do 1ms triggers. Perhaps you can extract what you need from there. Midibox CV has 8 ate outputs, but I don't see any mention of 1ms triggers.
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Stryd_one: Youv'e hit the nail on the head with both comments above.
Doug: Maybe I just need to spend more time with FPD, but It seems difficult to measure things acuratley without doing lots of X-Y coordinate math. If I am just going to drill the panel myself, I can use VISIO, and I can whip right through it. How do you "Array Shapes" (a VISIO Command that can easily create repetitive rows and columns with precise placement) in FPD? That's really my biggest gripe.
AS for sketchup you will notice that I said I like it and use it a lot, despite being cripple ware.
And for KiCAD, I tried the eagle to kicad schematic converter ULP but it fails always and leaves and incomplete schematic. Apparently others have complained about this and the name it seems is not going to fix it. funny that CADSoft would let it stay on thier website if it doesn't work.
If I could afford Eagle, I would use it, no doubt. But I want to do large CS layouts so.........
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Both are perfect and relatively bsimple examples of what MBHP is capable of.
Ha... Stryd_One has beat me to it.....
Anyway, Welcome, and enjoy.
Oh, and be prepared to get sucked into the world of midibox never to be released....
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There are eagle scripts that will convert libraries to kicad, and schematics too. haven't tried the one for the schematic, but the library seems to work. Also you can find on the web that someone has already converted the libraries. I started learning Kicad because it can do boards of any size. I am still getting used to it and am much better in eagle, alas I can not pay the price for the unlimited version of eagle.
As for CAD, I use VISIO, FPD, & Sketchup. VISIO is great for front panel layouts (I drill them myself so far)it can save as DWG or DXF, though I have not tried that feature yet. FPD I find to be a pain to use and Schaffer panels seem expensive to me (thought they look better than any I have ever made. Sketchup is just easy to use and I have done a lot of things with it, its great for "Will this Fit" scenarios. Some hate it because it is google and cripple ware, but It works for me. I have not tried wings 3d yet, even though I installed it with KiCAD.
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I agrre with Lief, I try to salvage as much as i can. All the buttons, case, and many connectors used in my seq are salvage. Soon I will put up some pics.
Your work looks good, just needed to tidy up that wiring A bit. I know it is sometimes a pain during tetsing when you need to take stuff apart all the time. At least you have learned the lesson to keep audio away from noisy signal lines, and perhaps a good lesson in gain staging.
Anyway keep up the good work!
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Do you have diodes on your matrix?
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Detented? Don't know of to many pots with more than a center detent, but there are many detented encoders with diferent numbers of detents.
You could build a stepped attenuator for a detented pot, but I think the encoder is a better choice for this application.
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I fail to see how you can get continuous values using an ADC? even at 16 bits it is still digital, ie not continuous. Higher resolution perhaps.
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Excellent!
Good work.
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Glad I threw that link in there then, It does sound like a bunch of nonsense doesn't it. I actually found the link because I wasn't absolutely sure that nematic was the right word.....but it was 8)
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No, it is super twisted nematic, negative means that the charecters are light coming through the dark areas, rather than dark areas over the light, ya dig? clear charecters on a dark background.
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Please share if you get this working, I have thought this would be useful in the past, but have no time to work on it currently. Also, you could look at modifying the IIC MIDI firmware to be an IIC Serial port, could be useful for those who need to control mopre than one serial device, and I think it is hinted somewhwere on the IIC MIDI page that this is possible, but it needs development.
Anyway, it's a good idea and makes MIDIbox even more flexible.
FYI: my interest in this is to build a transport controller for the DV decks I use at work, amongst others.
Thanks!
AB
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That's what I was getting at......
Glad you got it working.
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The 5 and 9 volts should add to 14 when wired as per the schematic. How are you checking the voltage? don't be afraid to hook up your modules without the IC's stuffed, and check the power pins for the proper voltage. You could safely use a 7809 on the sid board instead of a 7812, to get the nine volts you need. You may need a heatsink on it (it will be dropping 5 volts as heat). If you are careful you may be able to just use the single 7809 on the optimized psu, but i think the wiring will need to be different, because of the way the 5 and 9 volts are added to get 14, and you wouldn't want to do that to only get 9. If you don't have a clue what I'm talking about, just put the 7809 on the sid module(s) and be done with it. That's what I did on my first sid. (I am using my own powersupply for my MB6582).
Hope I'm not confusing you further.
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REspect to me? That wasn't me in that video. I've begun practicing the technique and I got all kinds of bridges. good thing I have lots of junk boards at work to practice on, just heatem up with a heat gun and tap against the table, then the chips just jump right off. This technique is not recomended if you actually want to reuse the chips though. and clean the board real good, that has a major affect on the outcome. I am going to try liquid flux next time instead of paste. This guy here has some mad skillz and the comments give away what is not explicit in the video:
http://www.youtube.com/watch?v=4V7tBPsECjc
He uses liquid flux. watch his other videos as well and drool over his workstation. As for all those smt resistors and such.....you could try the Frying pan reflow method.....
I hand soldered my MBFM chips yesterday (point to point technique) and it came out OK, but by no means a work of art. not bad for my third attempt at SMD soldering.
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The SSM's may be obsolete (not sure, but mouser doesn't have them), but the Burr-Brown, and THAT chips are still availible at mouser and are pin compatible (and better specs). I was going this road because I already have some chips. I would wonder how the discrete solution specs against the integrated ones? I could always look at doing both I suppose.
No progress this weekend, I barbecued 1000 pieces of chicken on saturday, and on sunday I broke out my stereo zoom microscope to practice SMD soldering. Some progress this week perhaps, though as usual I am working on this, an MB-6582, an MBFM, and MBSEQ in parallel.
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Got my boards yesterday.
Thanks!
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Perhaps the possibility to slice beats on the seq itself.....would require some sampling hardware though. well, at least sample playback hardware, I personally would have no problem only being able to import the samples from SD cards, with no recording.
Longer patterns would be great also, already on your list.
Touch screen ?
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well.. id like to see someone solder those smt's on by hand ...
http://www.howardelectronics.com/jbc/dragsoldering.wmv
Also some others on youtube, but I can't get there from work. search for Drag Solder. some guy does a huge QFP...Pretty cool actually
Not saying the board is hand soldered, but it can be done.
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hehe, you were meant to go junkyard dog for the failure to search.
this was more fun, though...
Actually, you were meant not to go junkyard dog....I was trying to set an example of humility.
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Ok, still waiting on SID parts but I breadboarded the output circuit today. works nicely. Tested with my Korg ES-1. Left channel through the converter to one input on m,y DELTA 1010 (balanced inputs). the right channel I plugged straight into the 1010, unbalanced, so it shorts the -VE side of the balance3d input to Ground. the results? The expected 6dB increase on the right channel (OK, i didn't measure, just recorded a few quick tracks into a stereo channel in Cubase). It had good clean signal, though I didn't do stringent testing, maybe later.
Confirmed pin compatible parts from Burr-Brown(TI) and THAT Corp. so there will be options for other builders if anyone is interested.
I have some of the Burr Brown balanced line receivers in my parts box so I will breadboard the input circuit next. UI'll let you know how it goes though I am expecting it to go much the same as this last test. will be a busy weekend though so I may not have anything this weekend.
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News:
Input buffer / "differential line receiver" board complete.
Switchpoint Matrix already complete.
Output buffer / "differential line driver" soon.
Everything else, as they say, is straight outta uCApps!
I am currently working on a balanced I/O board http://www.midibox.org/forum/index.php/topic,12149.0.html
I was wondering if your schematic was available and how you have implemented your design., care to share, or too early?
And as another thought related to the matrix... How hard would it be for the matrix to talk to MB Mixer so that if I had 16 inputs on the MB Mixer connected to 16 outputs of the matrix, the mb mixer would display what source was coming in from the matrix? this would then update if the matrix patch was switched? Could probably be done with SysEx? That would be a really slick level of integration. just a thought, And I'll say this: this matrix and the mbmixer interest me, but are far off on a list of projects to complete, so don't take any pains to implement this just for me, I'm just throwing it out b/c I thought that it would be cool....
Thanks
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Your questions have me looking the SID module over.
Instead of answers, I have more questions.
You mentioned using this with the MBMixer.
Yes, it will work with that. But the MBMixer has support for balanced inputs and outputs already. It has had balanced support for almost four days now! :-)
(ok, I have got that off my chest, back to your questions)
Very nice, I see you are simply using two inverting opamps for your balanced line driver.
Question 2 asks if you would need to attenuate the input level before going into the SID. Wow, I never knew the SID had an input! As a rule, inputs may never exceed the voltage range of the chip. So what's your chip running at? Depending on the model, either 0 to 9 or 0 to 12 volts.
I am using 8580's which run at 9V
So ASSUMING that the audio input is biased between 0V and +9 or +12 V,(a fair assumption after seeing the schematic) you must keep the peak to peak voltage of the input below 9 or 12 volts.
OK
You mentioned that you are taking + and - 15 volts into your SID.. but the prints I saw only showed +5 and either +9 or +12, depending on the model. Maybe I saw the wrong schematics. So my assumption above may be wrong.
Is this Sid Ver 2 based on the Sid board that Smash sells at his shop? I don't see any negative voltages there. (He's a really positive guy that way).
If it's something else, where can I see a drawing?
It is the mb6582 base pcb from smash TV's webshop, which was mentioned in the second sentance of my opening post. I am using my own external supply that has +5V and +/-15V, inside the sid box i will be regulatimg down to +/-12V for use with seppomans ssm2044 filter board and AOUT modules, and +9 for my 8580 sids.
However, the ssm2142/2143 can operate at up to +/-18V, so I was wanting to know if I gain any advantage in running them at a higher voltage than the SID? I am under the impression that this would allow me to take in a higher level of signal without clipping on the input side, but I am unsure wether I truly gain any advantage on the outputside.
Will your design provide Phantom power if needed? If you are looking for the most options, you might want to include that one.
Wasn't thinking I'd ever need to hookup a condenser mic to my SID, but if there is interest in using the board for other purposes I could loook into it. I would then need to generate the 48V for phantom though.
Looks interesting!
LyleHaze
Thanks. As I said in my first post, I will know more once I have breadboarded the circuit.
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Ok, so here's the Idea I am having. I want a Balanced I/O board for my MB sid V2 (using the base PCB of the MB6582) but it also could be suited for other uses MBFM, MBMixer, Standalone balanced/Unbalanced converter box, etc....
I am thinking of using the SSM2142 and 2143. Why, because I already have a tube of 2142's, also these are pin compatible with some other line drivers on the market (ones made By THAT Corp. , maybe others too). I have attached the datasheets below
So Q's and thoughts:
1) Since I am already taking +/- 15V into my sid(EDIT here I am refering to the machine as a whole, not the SID module)to regulate down to +/-12V for AOUT and Seppoman's filter module, and +9 for the 8580 sid's I am using, should I supply the 2142/2143 with 15V? or is there no point when hooking up to the SID? of course I could leave the option for both, the chips will take up to +/-18V.
2) Do i need any sort of buffer between the 2143 (balanced line reciever) and the SID input? I was thinking I may need a pad or variable attenuator to deal with high input levels, will this be sufficiewnt to protect the input?
3) would anyone else be interested in this project when I am done? What else would you want to see on the board?
4) there is also a SSM2141 reciever, only difference is the gain. the 2143 is designed as a unity gain transmission path when used with the 2142.
5)Insert points for feedback/effects? how to best do this? leave them as unbalanced and take them before this board?
6) I was going to make one big 8 channel board, but for MBFM this would be overkill, of course components could be left out, I guess final board size will determine this.
7) I am going to breadboard the output part of this circuit as soon as I get some remaining parts for the MB SID. I don't have the reciever chips yet, waiting for feedback on #4 above before I decide which to order.
Thanks all,
Let mem know what you think.
Preferred CAD programs (electronic & drafting)
in Miscellaneous
Posted
Hmm. it worked for you? Did you have to do anything special? Did you have to have the same libraries converted to kiCAD? I always get an error "Component end expected at line 782, aborted" when opening in eeschema. what version of EAGLE/KiCAD? It fails on both my setup at home and work. I have eagle 5.0 at work, 5.2 at home. Kicad is version 2007-11-29-c.
As for the chat, well I have a not so good internet connection at home, and I think it may be frowned upon to chat at work. maybe if I had a work related project.....
And to the OP: I think if your work is footing the bill, you should go for EAGLE, just get quotes for Protel, Pads, Mentor Graphics stuff so you can say that it is a good deal ;) Which it is.