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axl
Joined: Oct 28, 2012
Posts: 30
Location: ita
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 Posted: Sun Oct 28, 2012 7:56 am Post subject:
Thank you Mr.Yves
Subject description: Your website inspiring me to built my first modular |
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thanks for you job and your passion Yves!
I've start one month ago, I've built a couple of Monimoog Vcf and a wave folder.
Here some picture made with a cheap phone ahahahahah.
Just one question if some one can help me, is it normal the VCF is so noisy???
I have a kind of ground noise around 100hz @ -27Dbfs it's a bit huge right????
I've don't matched the 47n capcan be this the problem??????
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axl
Joined: Oct 28, 2012
Posts: 30
Location: ita
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| Posted: Sun Oct 28, 2012 1:30 pm Post subject:
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I think is something to do with resonance if i disconnect the pot, or move the trim the noise drop down.
if i calibrate the trim the noise go up..... |
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Sebo
Joined: Apr 27, 2007
Posts: 518
Location: Argentina
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| Posted: Mon Oct 29, 2012 10:40 am Post subject:
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100Hz is probably hum from the PSU, the hum is worst when you turn up the resonance as the circuit consumes more current. Try a better PSU with more current capacity, or try to connect only the VCF to check if the problem goes away.
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Sebo
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My Music:
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axl
Joined: Oct 28, 2012
Posts: 30
Location: ita
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| Posted: Mon Oct 29, 2012 4:10 pm Post subject:
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Hi sebo,
thanks for the reply!
I've try to connect only the vcf but the problem persist,
If i connect the wavefolder i don't have this problem so i don't think is that but maybe Im'wrong..........
I'm using the 15v psu from curetronic. |
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axl
Joined: Oct 28, 2012
Posts: 30
Location: ita
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| Posted: Tue Oct 30, 2012 12:05 pm Post subject:
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PROBLEM SOLVEEEEEEEE!!!!
was one of the 2 capacitor on the power soket
WEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE  |
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ungleichklang
Joined: Dec 03, 2011
Posts: 63
Location: East-Belgium
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axl
Joined: Oct 28, 2012
Posts: 30
Location: ita
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| Posted: Tue Oct 30, 2012 6:14 pm Post subject:
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Thanks mate!
Ye the curetronic psu is pretty cool is'nt???
Is the better i could find online.......
How many module can you run with it??? |
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ungleichklang
Joined: Dec 03, 2011
Posts: 63
Location: East-Belgium
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| Posted: Wed Oct 31, 2012 12:45 am Post subject:
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| axl wrote: | Thanks mate!
Ye the curetronic psu is pretty cool is'nt???
Is the better i could find online.......
How many module can you run with it??? |
Do you have the older "open" one or the closed (caged) one ...??
You can't say how many modules exactly can be run with a PSU, it all depends on the Ampere it can deliver and the module takes ..
f.e. (easy explanation) :
there are VCF that take 5 mA and others that take 30 mA
the Yusynth Fixed Filterbank takes 70 mA
the one VCO takes 40 mA another takes up to 100mA
Klee and MPS need ~100 mA each
and so on,
it also makes a bit how much it takes on the -15V-Rail and howmuch on the +15V
normally its both the same, but some modules don't
so it all depends on the modules you build
my curetronic-PSU (which is a Meanwell PSAI 24W +15V -15V) will deliver 800mA on each Rail, so I can server about 10 to 15 modules with it ...
I have 4 of those PSAI, so in total about 3.200 mA for each Rail 
For the yusynth-modules I found this xls
http://ebookbrowse.com/currents-yusynth-xls-d102712152
Hope this helps a bit (and hope my explanaitions as non-professional are correct)
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greetings from belgium, Sascha
My new blogspot: http://ungleichklang.blogspot.com
My Youtube-Channel: http://www.youtube.com/user/ungleichklang
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axl
Joined: Oct 28, 2012
Posts: 30
Location: ita
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| Posted: Wed Oct 31, 2012 6:34 am Post subject:
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thanks for the reply, very clear!
I have the caged version, T-40C it can delivery 1,5A on +15rail and 0.5A on the -15 rail. (on the website is described is 2A for +15 and 1A for -15 but is not true).
How to know how many A i'm using??
Just take my digital amperometer and put the tip on the DC rail ????
thanks for the reply.
Just to know isn't better to use a big toroidal psu instead of 4 small one????
Just asking beacouse some time i've see inside some hi-end pro equipment (like API SSL and NEVE stuff) and alwis see big oversized toroidal psu
alex |
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ungleichklang
Joined: Dec 03, 2011
Posts: 63
Location: East-Belgium
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| Posted: Fri Nov 02, 2012 12:59 am Post subject:
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| axl wrote: |
How to know how many A i'm using??
Just take my digital amperometer and put the tip on the DC rail ????
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I think that is the best way, else you only can assume how much it is and keep it in mind if any weird things happen after adding a new module ...
| axl wrote: |
Just to know isn't better to use a big toroidal psu instead of 4 small one????
Just asking beacouse some time i've see inside some hi-end pro equipment (like API SSL and NEVE stuff) and alwis see big oversized toroidal psu
alex |
I bought the PSAI cause it has same mA on both Rails, plus I might decide (already have decided) to build another cabinet (2nd and 3rd), then I can split them up or ....
I don't know => will see then 
_________________
greetings from belgium, Sascha
My new blogspot: http://ungleichklang.blogspot.com
My Youtube-Channel: http://www.youtube.com/user/ungleichklang
My old google-site: https://sites.google.com/site/ungleichklang/home/s-diy
Linux Musician |
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