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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
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 Posted: Wed Apr 15, 2009 6:33 am Post subject:
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| TekniK wrote: | | Matt,can u clock it at high very high speed ,and when u switch between audio signals is there an unwanted 'tik' or something audible? |
i will try tonight.
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creatorlars
Joined: Nov 26, 2007
Posts: 524
Location: Denton, TX
Audio files: 4
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| Posted: Wed Apr 15, 2009 11:44 am Post subject:
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| Off topic (maybe), but can you tell me where you got those red momentary pushbuttons? They look great! |
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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| Posted: Wed Apr 15, 2009 1:35 pm Post subject:
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| creatorlars wrote: | | Off topic (maybe), but can you tell me where you got those red momentary pushbuttons? They look great! |
you are not the first who asked 
i got them from Reichelt.de
this particular momentary is from SCHURTER, a swiss manufacturer operating worldwide.
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matthias
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crashlander42
Joined: Oct 21, 2006
Posts: 292
Location: Orlando, FL (US)
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mono-poly
Joined: Jul 07, 2004
Posts: 937
Location: Rotterdam, Netherlands
Audio files: 2
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| Posted: Wed Apr 15, 2009 7:56 pm Post subject:
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| 4 plz |
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Junk Rhythm
Joined: Jan 07, 2008
Posts: 81
Location: San Francisco, CA
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| Posted: Wed Apr 15, 2009 9:53 pm Post subject:
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| creatorlars wrote: | | Off topic (maybe), but can you tell me where you got those red momentary pushbuttons? They look great! |
You beat me to that question. Those pushbuttons look really nice. |
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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| Posted: Thu Apr 16, 2009 1:30 am Post subject:
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| TekniK wrote: | | Matt,can u clock it at high very high speed ,and when u switch between audio signals is there an unwanted 'tik' or something audible? |
i did a short test/try yesterday. i did not actually "hear" a "tik".
i fed the tri and the sin output of a VCO into I/O 1 & 2.
1st i clocked it by the square output of this VCO. made sound rich and nice.
2nd clocked it by the first devision of the VCOs square. sounded even more richer harmonically.
3rd i clocked it by another VCO (controlled by a LFO) and i got nice sweeps.
i will have to post same samples these days...
concerning the "tik". not that i have taken a look on the scope yet, but for me it seems obvious that there will have to be "glitches" when you switch between different signals in a not synchronized manner, isn't it natural? i think these artefacts will occur irregulary and more or less recognizable at different clocking times - or ratio signal freq/clock freq? just guessing here.
however the analog switch ICs are break-before-make.
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matthias
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xpmtl
Joined: Aug 10, 2007
Posts: 162
Location: Brussels, Belgium
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| Posted: Thu Apr 16, 2009 2:46 am Post subject:
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Still have all ur previous pcbs to build but yeah i'll take 2
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LektroiD
Joined: Aug 23, 2008
Posts: 1019
Location: Scottish Borders
Audio files: 2
G2 patch files: 2
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| Posted: Thu Apr 16, 2009 5:34 am Post subject:
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Count me in for 1 (definitely), possibly 2 (depending on finances)
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
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| Posted: Thu Apr 16, 2009 6:17 am Post subject:
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| Quote: | | (depending on finances) |
that is definetely an issue these days...
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matthias
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
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| Posted: Thu Apr 16, 2009 6:19 am Post subject:
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BTW Farnell stocks the DG412 from Intersil for about 2.-EUR.
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matthias
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numbertalk
Joined: May 05, 2008
Posts: 992
Location: Austin, TX
Audio files: 5
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| Posted: Thu Apr 16, 2009 7:23 am Post subject:
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| Actually put me down for 2 boards. |
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TekniK
Joined: Aug 10, 2008
Posts: 1059
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| Posted: Thu Apr 16, 2009 10:37 am Post subject:
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| fonik wrote: | | TekniK wrote: | | Matt,can u clock it at high very high speed ,and when u switch between audio signals is there an unwanted 'tik' or something audible? |
i did a short test/try yesterday. i did not actually "hear" a "tik".
i fed the tri and the sin output of a VCO into I/O 1 & 2.
1st i clocked it by the square output of this VCO. made sound rich and nice.
2nd clocked it by the first devision of the VCOs square. sounded even more richer harmonically.
3rd i clocked it by another VCO (controlled by a LFO) and i got nice sweeps.
i will have to post same samples these days...
concerning the "tik". not that i have taken a look on the scope yet, but for me it seems obvious that there will have to be "glitches" when you switch between different signals in a not synchronized manner, isn't it natural? i think these artefacts will occur irregulary and more or less recognizable at different clocking times - or ratio signal freq/clock freq? just guessing here.
however the analog switch ICs are break-before-make. |
ok,thanks for testing Matt.
To answer on your question ' isn't it natural',well its like the differences between high end desks when u use the mute button to bring in or cut the signal signal,with cheap desks u will have sometimes a 'tik' on high end u will not have a 'tik'
for experimentation using the module in 'audio mode' it will be (very) enoying |
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fonik
Joined: Jun 07, 2006
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ach_gott
Joined: Sep 09, 2008
Posts: 79
Location: Chicago
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| Posted: Fri Apr 17, 2009 8:38 am Post subject:
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| fonik wrote: | | BTW thank you all for interest. the PCB will get manufactured. |
Yay!
| Quote: |
i decided to provide additional footprints for cliff 1384 sockets (.8in spacing, like doepfer).
for the power i did not implement a MOTM .156 header, but a conventional MTA100 3-pin connector and a ribbon connector (eurorack).
this way the PCB is still generic, but with a thing for euro 
hope you are all fine with that. |
Blech!
The Modcan solution of 3 pin header to 4 pin header cable would work in this case, correct? |
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TekniK
Joined: Aug 10, 2008
Posts: 1059
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| Posted: Fri Apr 17, 2009 9:30 am Post subject:
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| damn,i did a search for those DG412,its almost impossible to get! |
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numbertalk
Joined: May 05, 2008
Posts: 992
Location: Austin, TX
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numbertalk
Joined: May 05, 2008
Posts: 992
Location: Austin, TX
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| Posted: Fri Apr 17, 2009 10:15 am Post subject:
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| The schematic shows a 4017N, which seems tricky to find - would a CD4017B work as well here? |
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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| Posted: Fri Apr 17, 2009 10:18 am Post subject:
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DG412, MAX313:
Farnell Europe stocks them (from intersil, about 2.-EUR)
Futurlec in Australia stocks the MAX313 (about 6.-USD)
concerning 4017:
yep. the schematic shows the device from the eagle library. other will do well... take a look at the datasheets. the letters indicate different packages or performance criteria (i.e. temperature range).
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matthias
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numbertalk
Joined: May 05, 2008
Posts: 992
Location: Austin, TX
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| Posted: Fri Apr 17, 2009 10:23 am Post subject:
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| fonik wrote: | concerning 4017:
yep. the schematic shows the device from the eagle library. other will do well... take a look at the datasheets. the letters indicate different packages or performance criteria (i.e. temperature range). |
Yep, just wasn't sure if any of that criteria mattered here. Thanks! |
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norman phay
Joined: Jun 29, 2007
Posts: 176
Location: North-East England
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| Posted: Fri Apr 17, 2009 2:56 pm Post subject:
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| Can you put me down for 2 of these please, Matthias? Many thanks. |
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wetterberg
Joined: Jun 27, 2008
Posts: 48
Location: denmark
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Posted: Sat Apr 18, 2009 12:40 am Post subject:
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| Matthias, put me down for two as well - looks like a fun and easy build! |
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xpmtl
Joined: Aug 10, 2007
Posts: 162
Location: Brussels, Belgium
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| Posted: Sat Apr 18, 2009 4:26 am Post subject:
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| fonik wrote: |
for the power i did not implement a MOTM .156 header, but a conventional MTA100 3-pin connector and a ribbon connector (eurorack).
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Would have prefered the standard MOTM header. If u don't have the space can u make the mat 100 a 4 pin one (2 grounds in the middle). That way it would be easier to make 156 to 100 cables.
A .156 header would be best tho 
Anyway, thanks for that project matthias
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krisp14u
Joined: Nov 11, 2006
Posts: 206
Location: uk
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| Posted: Sat Apr 18, 2009 5:02 am Post subject:
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| xpmtl wrote: |
Would have prefered the standard MOTM header. If u don't have the space can u make the mat 100 a 4 pin one (2 grounds in the middle). That way it would be easier to make 156 to 100 cables.
A .156 header would be best tho
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I would like the 156 header but if its got to be 100 make it a 4 pin 
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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| Posted: Sat Apr 18, 2009 6:51 am Post subject:
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| Quote: | | If u don't have the space can u make the mat 100 a 4 pin one (2 grounds in the middle). That way it would be easier to make 156 to 100 cables. |
| Quote: | | I would like the 156 header but if its got to be 100 make it a 4 pin |
good point. i will do that.
i am not offended, i just want to explain: we have MOTM, DOTCOM and EURO. if i implemented all three headers i would need half of the board to do just this (almost ). there are so many flavours, even about front panel components. so i made a decision this time. i think that is still fine - there are a lot of DIY-boards out there without any standard headers... so "something is better that nothing"?!
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matthias
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