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Clack
Joined: Aug 08, 2005 Posts: 438 Location: Walthamstow - london
Audio files: 5
G2 patch files: 1
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Posted: Fri May 02, 2008 2:58 am Post subject:
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Yeah, I just figured that out - literally 5 mins ago - thanks anyway. Bit of a mission to compare the parts list against the wiring diagram, would have been easier if the wiring had the values on it too!
lets hope I can get this baby up and running soon!!! _________________ Clacktronics.co.uk |
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sneakthief
Joined: Jul 24, 2006 Posts: 569 Location: Berlin
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Posted: Fri May 02, 2008 3:03 am Post subject:
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for the sake of updates & consistency, it makes no sense to spread the part values over multiple pdfs - it's better to have them on a centralized BOM, albeit slower to cross-reference. _________________ Sneak-Thief - raw electrofunk |
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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: Fri May 02, 2008 5:40 am Post subject:
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There are many (and major) ways that Laurie could improve the ASM-2 experience. From my experience, mostly concerning layouts, BOMs, wiring etc.
Keep in mind that my experience may not be indicative of the support he offers today. It's based on the docs I received over 5 years ago.
I would definitely be in favour of all documentation for a particular module being in the one .pdf. I still find that looking at my PCB, trying to adjust trimpots, and working out which component is where means having three pdfs open at the same time, and switching between them, which is not very good.
I think this is mainly due to the lack of practical feedback, and therefore could be improved by people giving Laurie their reports of building difficulties. I must admit, I've been remit in this department, but then again, I'm using a "prototype" board, and I don't want to confuse Laurie regarding problems I have which I know have already been resolved on the latest PCBs. _________________ What makes a space ours, is what we put there, and what we do there. |
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synthnl
Joined: Oct 19, 2007 Posts: 33 Location: Ede
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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: Sat May 31, 2008 4:19 pm Post subject:
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Hey Synth.nl!
Just had a look at your site, the PCB seems to be coming along nicely. Are you getting the front panel made by someone else? (schaffer, etc.) or building your own from scratch?
I've got about 90 * 120nF caps sitting here. I'd teleport a few to you if it were worth it, but you've probably already got them. Which ones are they? ie: which module, des no.?
So has Laurie got all the associated info grouped by module into single pdfs yet?
I feel like I should get in contact with him and give him some feedback now that my ASM-2 is virtually finished. He visits this forum from time to time.
My only major issue is with the filters, neither of which give that warm, squelchy resonance with a smooth rolloff of other harmonics which is so musical and tactile as on the SH101. The SH101 is the only other analogue synth I've ever owned, so I only have that to compare with, but these seem very thin, and as you bring up the resonance, the lower frequencies drop right off and then the resonance almost immediately rings itself into a very unmusical, overdriven kind of screeching. There is a sweet spot (at quite low volume) but it's easy to miss it.
I'll be very interested to see what yours sound like, and if they're the same as mine, maybe we can find a way of taming it.
SneakTheif has finished an ASM-2 as well. I should point him towards this post and see what he thinks.
Keep up the good work! _________________ What makes a space ours, is what we put there, and what we do there. |
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Tallhobbit
Joined: Aug 10, 2007 Posts: 15 Location: Kirkland, WA USA
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Posted: Sat May 31, 2008 6:39 pm Post subject:
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To my eyes it looks as if the 120nF caps are for AC coupling of the Ring Modulator inputs. As such, I think that either 100nF or 150nF caps could be substituted for the 100nF caps. Also, a wire link should work if DC coupling is desired. I base this on the fact that Yves Usson has a dual ring modulator circuit on his Yusynth site that uses the same LM1496 Balanced Modulator chip and he has a DC coupling option on his schematic. It looks as if both RM's are based upon the the Suppressed Carrier Modulator circuit on the LM1496 data sheet. In that example, the carrier input is AC coupled with a 100nF cap while the modulator input is DC coupled.
I'm also building an ASM-2 and I got 120nF from Mouser. Granted, that doesn't do much good for our Euro-Friends but it shows that they are available.
James |
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sneakthief
Joined: Jul 24, 2006 Posts: 569 Location: Berlin
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Posted: Sun Jun 01, 2008 1:08 am Post subject:
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the 24db VCF sounds great to me - and of course it kills the low frequencies when you boost the resonance, because that's how the moog ladders always worked. i never found it to be unmusical, but rather the opposite.
it could be a matter of personal taste though, or perhaps the pot values for the controls.
as for the variable-state filter, it sounds fine. i have the wrong resonance pot in their and in the last 1/6 of the knob rotation it goes into some wild untamed resonance. i love it!
i'm neutral on the musicality of that filter... it always seems to get the job done, but i always run to the moog first for that warm sound. _________________ Sneak-Thief - raw electrofunk |
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synthnl
Joined: Oct 19, 2007 Posts: 33 Location: Ede
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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 Jun 02, 2008 2:04 am Post subject:
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sneakthief wrote: | the 24db VCF sounds great to me - and of course it kills the low frequencies when you boost the resonance, because that's how the moog ladders always worked. i never found it to be unmusical, but rather the opposite.
it could be a matter of personal taste though, or perhaps the pot values for the controls.
as for the variable-state filter, it sounds fine. i have the wrong resonance pot in their and in the last 1/6 of the knob rotation it goes into some wild untamed resonance. i love it!
i'm neutral on the musicality of that filter... it always seems to get the job done, but i always run to the moog first for that warm sound. |
Well, there must be something wrong with the way mine is put together. I've checked over the PCB, trace for trace, part for part, with the newest schematic, and couldn't find anything physically wrong with either of them. Maybe I've blown a chip or something (in both of them!) or maybe I'm just expecting a completely different kind of sound. I'm quite pleased with just about everything else, but the filters are definitely disappointing. _________________ What makes a space ours, is what we put there, and what we do there. |
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sneakthief
Joined: Jul 24, 2006 Posts: 569 Location: Berlin
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Posted: Mon Jun 02, 2008 2:16 am Post subject:
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should i post some sample of my filters using the asm-2 oscillators? _________________ Sneak-Thief - raw electrofunk |
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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 Jun 02, 2008 3:13 am Post subject:
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That would be great Sneakthief!
I'll do some samples as well, so you can hear what I mean. _________________ What makes a space ours, is what we put there, and what we do there. |
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sneakthief
Joined: Jul 24, 2006 Posts: 569 Location: Berlin
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sneakthief
Joined: Jul 24, 2006 Posts: 569 Location: Berlin
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sneakthief
Joined: Jul 24, 2006 Posts: 569 Location: Berlin
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Posted: Sun Jun 08, 2008 3:17 pm Post subject:
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Uncle Krunkus - any thoughts on these? I posted them just for you to compare & contrast _________________ Sneak-Thief - raw electrofunk |
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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: Tue Jun 10, 2008 12:37 am Post subject:
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Sorry Sneakthief,
I've been trying to do a recording of my ASM-2 so we could compare the two sets of filters, but I keep getting distracted by other stuff.
Yours sound quite good. I had a quick check of mine, and there's definitely something "not quite right" about them, though they're probably not as bad as I was making out.
Did you put the compensation caps (10pF) on the State Variable? I'm still not 100% about mine. They are polystyrene but they have code of (100) on them. Which is kind of vague, (some would say it must be an EIA code, and therefore 10pF, although I have heard of polys which have the pF value printed on them with no "pF" and therefore it could be 100pF) 100pF would cause problems for sure, yeah?
I'll try to record a sample tonight and post it for you. _________________ 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
G2 patch files: 1
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Posted: Tue Jun 10, 2008 6:14 am Post subject:
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Okay, here we go, 2 Triangle waves, into the VCFs with a slow LFO on the cutoff. Each LFO cycle I shift the resonance up one notch, from 0 -> 10.
One for each VCF.
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ASM2-SV-VCF.mp3 |
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ASM2-TL-VCF.mp3 |
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964.08 KB |
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1466 Time(s) |
_________________ What makes a space ours, is what we put there, and what we do there. |
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Clack
Joined: Aug 08, 2005 Posts: 438 Location: Walthamstow - london
Audio files: 5
G2 patch files: 1
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Posted: Thu Jun 12, 2008 2:26 am Post subject:
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the state variable one doesn't sound too good at all , squeely in a bad way. sounds like its getting too loud and going over the limit of your recording device too _________________ Clacktronics.co.uk |
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Tallhobbit
Joined: Aug 10, 2007 Posts: 15 Location: Kirkland, WA USA
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Posted: Thu Jul 03, 2008 11:11 am Post subject:
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I'm getting close to completing my ASM-2 PCB but I can find any OA91 germanium diodes for the VCO's. Does anybody see a problem if I use 1N60A's or 1N34A's instead?
Thanks,
James |
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synthnl
Joined: Oct 19, 2007 Posts: 33 Location: Ede
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Mick1
Joined: Sep 24, 2008 Posts: 2 Location: Salisbury. UK
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Posted: Fri Sep 26, 2008 3:16 am Post subject:
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Hi Guys
Found your forum while looking at the ASM-2, Have just order the PCB from Elby and hope to get started soon on the Wizard.
Just started to design a front panel, and any hints would be great.
I haven't touched any electronics for years, so thought it would give me a chance to get some of the old skills refreshed.
Hope you don't mind if I come to you guys for help and advice, I have found a lot of things you guys have posted to be really useful already.
Will let you know how things progress.
Cheers for now |
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sneakthief
Joined: Jul 24, 2006 Posts: 569 Location: Berlin
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Posted: Fri Sep 26, 2008 3:39 am Post subject:
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Enjoy your ASM-2 build. Maybe you've seen my page which shows some of my own experiences: http://www.sneak-thief.com/modular/
In any case, please consult the ASM-Wizard wiring guides when planning your front panel.
And try to make room for as many inputs and outputs as possible. That's what makes this modular so much fun. _________________ Sneak-Thief - raw electrofunk |
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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: Fri Sep 26, 2008 4:16 am Post subject:
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If any pics are missing, just let me know. Some may have been lost in the server crash last year. I'm pretty sure I've still got most of them, so I could re-post them.
I did a semi-patched out version which I called the Sorcerer. I can post the photoshop file of the front panel if you like, (if it's not still around here somewhere) but if you're doing the fully patched version, I'd stick to something closer to Elby's Wizard layout. Mine might give you some inspiration though I s'pose.
I'm sure your skills will be back up to scratch by the time you get it finished. It's quite a big project. It's a great starting point for a DIY modular though. You won't be disappointed.
Feel free to ask any questions that come up. I pretty much know mine back to front now. And yes, there are still some things I'd like to tweak and test and calibrate etc. _________________ What makes a space ours, is what we put there, and what we do there. |
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Mick1
Joined: Sep 24, 2008 Posts: 2 Location: Salisbury. UK
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Posted: Sat Sep 27, 2008 7:54 am Post subject:
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Thanks for the welcome guys.
Pcb is on the way from OZ to the UK as we speak, looking forward to that. Definatley going down the full modular route, but I need to check out the CD as some of the things on the Elby site seem a bit strange. Where is the wiring diagrams for the VCO's to front panel.? I can't find anything about the inverters.
I have been getting some of the components together, but I think I might have to get Elby's special component kit.
Love your Sorcerer Uncle K. an excellent job. ( any chance of a copy of the art work, I won't copy it)
I'll check out out site now sneak thief.
Catch you guys later |
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sneakthief
Joined: Jul 24, 2006 Posts: 569 Location: Berlin
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loss1234
Joined: Jul 24, 2007 Posts: 1536 Location: nyc
Audio files: 41
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Posted: Wed Nov 12, 2008 6:58 am Post subject:
lfo bleed? |
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Hey guys
i am close to doing the panel for my ASM2 board (and i am going to be using a few custom boards in addition) and am just testing out all the circuits. i have been really excited to hear what this board sounds like BUT in the last 2 days something has really rained on my parade.
to make a long story short, when i plug in my POWER ONE +/- 15 psu (which i am using in conjunction with laurie's +/-10volt reference and smoothing caps), i CAN hear the VCO just fine BUT the two lfo's are bleeding through it!! it is SO annoying and is really ruining the whole project for me at this point.
the ONLY way to get the lfo's to stop modulating the vco (which they are NOT hooked up to at all...there are no wires yet connecting them to the vco inputs and no solder bridges either) is to turn their speed to zero or to disconnect their opamps.
i have tried with and without the LEDS hooked up and with the LEDS it is worse but without it is still there.
any advice would be HIGHLY appreciated. did anyone else experience anything similar? how did you get rid of it?
and IF you used an external power supply, what kind did you use,etc.
thanks so much!! _________________ -------------------------------------------- check out various dan music at: http://www.myspace.com/lossnyc
http://www.myspace.com/snazelle
http://www.soundclick.com/lossnyc.htm http://www.indie911.com/dan-snazelle |
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