Joined: Jan 29, 2007 Posts: 300 Location: Australia
Audio files: 1
Posted: Sun May 20, 2007 4:38 pm Post subject:
Nice job on the ASM-2 Uncle Krankus. Have you got a part number for that case? It looks like just the ticket for a project I'm currently working on but I can't seem to find it in their catalogue.
[editor's note: reduced the size of the link that was way to wide. --mosc] _________________ What makes a space ours, is what we put there, and what we do there.
Just a quick update on what's been going on with the ASM-2.
Recently I've done a load of modifications to the front panel controls.
These were based on a few hours of setting up, testing, and general playing with control options. Mostly modulation inputs, but also the adding of functional front panel patch points for keyboard CV in, Gate ins, Trigger ins, VCF-CV ins, SQR outs, and a power out to run an input interface of some kind. This could be a typical CV+Gate type keyboard, but I plan on finishing my Electro-Didge slide controller / Resonator and using that as the main "instrument" input.
I've also been doing a lot of this work in preparation for the arrival of a beautiful bouncing baby Klee Sequencer. When will it arrive? I don't know! But it's so exciting!
BTW If anyone wants a copy of the front panel artwork (including the latest updates) for their ASM-2, just let me know.
BBTW I should have some cool samples to post fairly soon, which will show off what it's capable of. _________________ What makes a space ours, is what we put there, and what we do there.
I've got 9 jacks on the front now, and even though there's only nine, they all work!
Sorry if this seems a bit remedial to some, but the last time I actually played around with patch cords was in 1982, when we got hold of a System 100 in our music class at school.
I've got: -
SQR out of VCO1
CV in for VCF1
CV in for VCF2
Keyboard CV in (switch patched to lots of things)
Keyboard Gate in
Re-Trigger in for the ADSRs
VCA1 out
VCA2 out
Supplemental power out to feed my CV source
I'll be ordering a whole load more sockets soon, and I've got room for another 25 patch points. The original labelling has already gone out the window, but I figure it's good to keep the actual patch points an evolutionary thing at this stage. I won't know what I want till I need it.
Here's a nice drone I was playing with. It's got a bit of reverb on it. With the sub turned on, this is real close encounters kind of stuff!
ASM-2 07.mp3
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_________________ What makes a space ours, is what we put there, and what we do there.
Joined: May 26, 2007 Posts: 10 Location: Flat Top Mountain
Posted: Sun Jul 01, 2007 2:53 pm Post subject:
Yes, more please.
I've been foolin around with virtual analog software synths for some time, and while never having had the opportunity to fool around with proper analog gear, I've suspected that there is a difference. listening to that drone not only clarifies the difference, but inspires the resolve to build.
Joined: Aug 08, 2005 Posts: 438 Location: Walthamstow - london
Audio files: 5
G2 patch files: 1
Posted: Fri Jul 20, 2007 11:15 am Post subject:
Hi, Im gradually building the asm-2 got the board from elby. Just want to ask a few questions
I am using quarter watt resistors rather than half do you think this will give me problems? I assumed not. I am also curious about capacitors , he lists the voltage of the capacitor as well as the type ( mylar , polyester, ceramic, multilayer ceramic ) do I have to follow this closely? if not would I run into problems?
as for a 50ppm resistor - I have found on a datasheet that my resistors are 50ppm max would this be ok? I assume when they say max they have no idea what it could be so no?
I am going to make mine a semi modular, will post when im finished ( in a year! )
Joined: Nov 09, 2006 Posts: 649 Location: Spring Lake, Mi, USA
Audio files: 21
Posted: Fri Jul 20, 2007 12:30 pm Post subject:
Mr. Clack,
I have not built the ASM stuff personally, but you need to follow the capacitor recommendations on voltage. They can be higher rated, (for instance you can sub a 50v for a 16v cap), but don't go with a lower rating. The type myler, etc. needs to be followed. Caps have different characteristics concerning leakage, temp dependence, etc. Also, when the pcb is being laid out, a certain type of cap with a specified value has a certain lead spacing and width, height and thickness. By substituting, you run a risk of not fitting in the space or the leads not fitting in the holes very well.
Joined: Aug 08, 2005 Posts: 438 Location: Walthamstow - london
Audio files: 5
G2 patch files: 1
Posted: Fri Jul 20, 2007 1:06 pm Post subject:
how does the voltage rating of a cap affect it? does it make it more accurate? does it just the risk of popping caps?
sorry maybe too genral electronics rather than asm , its just I dont know how I could find out this stuff reading books! ( maybe im reading the wrong books )
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
Posted: Fri Jul 20, 2007 2:13 pm Post subject:
Mr Clack wrote:
sorry maybe too genral electronics rather than asm , its just I dont know how I could find out this stuff reading books! ( maybe im reading the wrong books )
You are spot on there. Electronics textbooks don't tell you many of the things you need to know for building practical circuits. Especially in the area of passive components, such as caps. But there are literally hundreds of years of combined building experience on this forum, so don't ever feel like you shouldn't be asking questions about things that seem simple. Often they're not.
Joined: Aug 08, 2005 Posts: 438 Location: Walthamstow - london
Audio files: 5
G2 patch files: 1
Posted: Fri Aug 31, 2007 4:39 am Post subject:
Hi just a quick question, I have a 3600ppm tempco and elby designs construction sheet tells me i therfore need a 50ppm resistor with it. Where do I get that ! the resistors I use say "upto 50ppm" will theese work? but i assume upto means it could be any value below that? or not?
here's my layout if anyone's interested!!! (its a draft ) a modified version of the wizard, its going to be on A3 white perspex
I just had a quick look around and found a copy of the BOM which quotes a 1K 3500ppm plus a 62R 100ppm. I think the point is that if you use a 3600ppm you don't want the other one to shift very much at all, therefore the specified 50ppm (or less). To be honest I don't think the extra resistor's co-efficient is that critical. (It's a 1/16th of the value which is changing at 1/35th the rate of the tempco. I think it's basically just a 62R to make up the numbers)
Does that make sense?
Does anybody else know more about this? I'm just working it out intuitively, there may be more to it than that. Mine uses what seems to be just a bog standard carbon resistor, and I got them in a set with the tempco's from Elby.
In fact I'm pretty sure that a standard carbon resistor would be rated at 100ppm, and that a metal film resistor would be 50ppm (or less). Correct me if I'm wrong. _________________ What makes a space ours, is what we put there, and what we do there.
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
Posted: Fri Aug 31, 2007 7:10 am Post subject:
Uncle Krunkus wrote:
I just had a quick look around and found a copy of the BOM which quotes a 1K 3500ppm plus a 62R 100ppm. I think the point is that if you use a 3600ppm you don't want the other one to shift very much at all, therefore the specified 50ppm (or less). To be honest I don't think the extra resistor's co-efficient is that critical. (It's a 1/16th of the value which is changing at 1/35th the rate of the tempco. I think it's basically just a 62R to make up the numbers)
Does that make sense?
Does anybody else know more about this? I'm just working it out intuitively, there may be more to it than that. Mine uses what seems to be just a bog standard carbon resistor, and I got them in a set with the tempco's from Elby.
In fact I'm pretty sure that a standard carbon resistor would be rated at 100ppm, and that a metal film resistor would be 50ppm (or less). Correct me if I'm wrong.
The extra resistor is to make the combined resistance have a tempco of closer to ideal. Its own coefficient isn't critical -- just use a metal film and you will be OK. BTW, there is usually a large uncertainty in the actual tempco, so the correction won't be exact anyway.
Carbon film resistors have tempcos in the -200 to -800 ppm/K range. I sometimes use them to compensate the temperature dependence of the VCO core. Metal film resistors may be had with different tempcos. Most common are +/- 100 and +/-50 ppm/K.
Joined: Nov 09, 2006 Posts: 649 Location: Spring Lake, Mi, USA
Audio files: 21
Posted: Fri Aug 31, 2007 7:30 am Post subject:
Uncle Krunkus,
Your tuition is right on regarding the temp coefficients with the thermistor and resistor. I haven't built the ASM-1 or-2, but I have ~20 yrs of temp compensating experience thru my job. I pulled a random part from RCD and they show a temp coefficient of +/-50ppm on the slope, then there is a linearity deviation of +/-0.2% then there is a self-heating issue of +2mW/degreeC. In other words, we just need to get into the ballpark.
But remember, the silicon we're compensating is not a very tight, precise figure either....and probably much less so. My company used to make +8000ppm/C parts. They are made of a heavily doped P silicon ( a diode is a +P and a -N silicone, so these parts are just P++, no N). Depending on where we got silicone at the moment, and it could be American, European, Chinese, Russian....., the slope could vary maybe 500ppm.
So, in some ways, it's like those non-critical caps. A 0.15 might do good for a 0.22. We just don't want to throw in a 4.7uF or a 15pF cap, but we do want to get in the general ballpark (concerning the total ppm for the thermistors).
Yeah, I thought it was like that. Mostly a case of dragging the response back towards the ballpark. Hell, I'm sure if you calculated an exact hole in one the wind would change! ie; the tolerance of 5 other components would start fudging the numbers. _________________ What makes a space ours, is what we put there, and what we do there.
Nice blog Michel,
I'll look forward to seeing how your ASM-2 comes along. _________________ What makes a space ours, is what we put there, and what we do there.
PCB is nearly finished. But I seem to have some trouble getting some components I thought weren't that hard to find. _________________ Michel, Synth.nl
Joined: Aug 08, 2005 Posts: 438 Location: Walthamstow - london
Audio files: 5
G2 patch files: 1
Posted: Thu May 01, 2008 10:26 am Post subject:
Hi,
Im trying at the moment to finish my asm-2 wizard, but I cant seem to find out were the non-100klin pots go ( 1m , 50k, 100klog etc). The only reference I can seem to find to what goes were is below but it only says which section it goes in - not what specific control each pot value is for
I was wondering is this information on the CD but not on the site? I have lost the cd! any one know were I can find this info! without having to guess with scematics!
ps here is a little sneak peak of mine, mmm white and beige
P1080796.JPG
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This image has been reduced to fit the page. Click on it to enlarge.
now download each pdf for each module and you can easily figure out which pots to use where by cross referencing them with the BOM. _________________ Sneak-Thief - raw electrofunk Last edited by sneakthief on Fri May 02, 2008 12:46 am; edited 1 time in total
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