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hway23
Joined: Jul 23, 2008 Posts: 61 Location: ks
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Posted: Tue Aug 04, 2009 5:14 pm Post subject:
Expand cv outputs. |
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to control more oscillators and such, do I just add more jacks to the output of a midi cv, or do I need some sort of opamp to keep the voltage from dropping? |
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skylab76
Joined: Dec 30, 2007 Posts: 38 Location: Austin
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Posted: Thu Aug 27, 2009 8:55 am Post subject:
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Hey hway,
If I'm splitting from 1 in to 2 outs, I just a add a jack or a Y cable.
If I'm splitting from 1 in to 3 or more outs, I use an opamp . From my experiences, the voltage drops after 2. I just put together this simple CV distributor (1 in to 4 outs) found here:
http://www.musicfromouterspace.com/analogsynth/cvdistributor.html
regards,
JG |
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Sebo
Joined: Apr 27, 2007 Posts: 564 Location: Argentina
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Antimon
Joined: Jan 18, 2005 Posts: 4145 Location: Sweden
Audio files: 371
G2 patch files: 100
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Posted: Sat Aug 29, 2009 11:53 am Post subject:
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In my Curetronic system, the multiple module is (by design) basically just 5 or 10 jacks connected in parallell - no power supply or ICs. Does this work differently for other systems, or should I expect (and possibly adjust for) a power drop if I hook to many things to the multiple?
/Stefan _________________ Antimon's Window
@soundcloud @Flattr home - you can't explain music |
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hway23
Joined: Jul 23, 2008 Posts: 61 Location: ks
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Posted: Sat Aug 29, 2009 3:49 pm Post subject:
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Yup, that's what I was looking for. Thanks! |
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emdot_ambient
Joined: Nov 22, 2009 Posts: 667 Location: Frederick, MD
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Posted: Mon Apr 19, 2010 1:45 pm Post subject:
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Antimon wrote: | In my Curetronic system, the multiple module is (by design) basically just 5 or 10 jacks connected in parallell - no power supply or ICs. Does this work differently for other systems, or should I expect (and possibly adjust for) a power drop if I hook to many things to the multiple? |
Most multiple modules are passive circuts but, yes, you should expect a slight drop in Voltage when using them. As mentioned above, if you split too many CVs the voltage drop will cause issues (oscillator pitch tracking).
Found some good info on it here in the comments section.
For most uses it's not a problem. But for pitch related and precision CV work--like controlling frequency on multiple VCFs when one or more are in self oscillation and you want them to track pitch--it's best to use powered splitters like those linked.
Splitting audio signals with multiples isn't so much an issue. You'll lose some amplitude at worst. Probably not an issue with triggers and gates either. |
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Antimon
Joined: Jan 18, 2005 Posts: 4145 Location: Sweden
Audio files: 371
G2 patch files: 100
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Posted: Mon Apr 19, 2010 2:16 pm Post subject:
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emdot_ambient wrote: | Antimon wrote: | In my Curetronic system, the multiple module is (by design) basically just 5 or 10 jacks connected in parallell - no power supply or ICs. Does this work differently for other systems, or should I expect (and possibly adjust for) a power drop if I hook to many things to the multiple? |
Most multiple modules are passive circuts but, yes, you should expect a slight drop in Voltage when using them. As mentioned above, if you split too many CVs the voltage drop will cause issues (oscillator pitch tracking).
Found some good info on it here in the comments section.
For most uses it's not a problem. But for pitch related and precision CV work--like controlling frequency on multiple VCFs when one or more are in self oscillation and you want them to track pitch--it's best to use powered splitters like those linked.
Splitting audio signals with multiples isn't so much an issue. You'll lose some amplitude at worst. Probably not an issue with triggers and gates either. |
Late but great answer there - thanks! It matches what I've experienced - I'm glad to get it confirmed. I've especially wondered about how the pitch sometimes drops a notch when I plug in something.
/Stefan _________________ Antimon's Window
@soundcloud @Flattr home - you can't explain music |
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emdot_ambient
Joined: Nov 22, 2009 Posts: 667 Location: Frederick, MD
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Posted: Mon Apr 19, 2010 2:30 pm Post subject:
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Fixed that for you
You also added a cap between the + and - rail. |
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Sebo
Joined: Apr 27, 2007 Posts: 564 Location: Argentina
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Posted: Mon Apr 19, 2010 4:28 pm Post subject:
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emdot_ambient wrote: |
Fixed that for you
You also added a cap between the + and - rail. |
My statement was right, the circuit at the right doesn't have pots, so I built
that circuit without the 100 ohms resistors.
And yes, I added 100nF decoupling caps to every chip and a two 22uF
electrolitics at power input (one for +15, one for -15). _________________ Sebo
---------------------------------------
My Music:
https://www.facebook.com/cosaquitos/ |
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