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Top Top
Joined: Feb 02, 2010
Posts: 266
Location: California
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 Posted: Mon Apr 04, 2011 2:07 am Post subject:
Clocking from analog source through audio inputs?
Subject description: locking my nord with +12v cmos pulse clocked devices |
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Hi
I've got a bunch of stuff that works in sync via cmos clocking and dividing. Most of it is running on 12V or 9v and stepped down via a few diodes on inputs.
I want to sync my micro's internal sequencers with this external analog stuff.
I couldn't find tollerances/specs for the audio inputs on the nord micro, other than it being "line level."
Can I push some +12v pulses in there without fear of damage? I think it would work fairly easily otherwise.
Or should I attenuate the pulses in some way before they get there?
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drapdap
Joined: Oct 11, 2004
Posts: 204
Location: London
Audio files: 1
G2 patch files: 1
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Posted: Mon Apr 04, 2011 6:20 am Post subject:
Re: Clocking from analog source through audio inputs?
Subject description: locking my nord with +12v cmos pulse clocked devices |
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Hi Top Top!
| Top Top wrote: |
Can I push some +12v pulses in there without fear of damage? I think it would work fairly easily otherwise.
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No! Don't do that! Could easily fry input circuitry! I hate that smell!
Audio level usually means no more than one volts, ac.
I've been clocking my Engine this way, but i used a voltage divider...
Also been clocking with the engine, than you have to boost the signal, say x10. Worked better this way, G2 as master, if you can sync yer cmos stuff from the outside. I bet you do... 
read this:
http://www.cgs.synth.net/modules/cgs60v1_sba.html
and a voltage divider applet:
http://www.raltron.com/cust/tools/voltage_divider.asp
Do yourself a favour and don't kill the micro, the don't make them anymore, and i totally and badly miss mine despite having an expanded engine...
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Roland Kuit
Joined: Sep 29, 2003
Posts: 1090
Location: The Netherlands/Sweden
Audio files: 8
G2 patch files: 127
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| Posted: Mon Apr 04, 2011 7:00 am Post subject:
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These patches represent an emulated Syncussion of Pearl.
It's a drumsynth from the '70's. you could play it by hitting
drumpads, but also trigger it with audio(ext) in(mic or other synth, cd-player).
The Nord Modular however, can be much more accurate and
has more possibilitys in sound configuration and other modules like sequencers etc.
The patches from this emulated Syncussion can be combined in
one or two Nord Modulars. you can aply velocity as well.
Now you can sample these sounds or sequence them with drumcomputers
or sequence programs. You have to define the NOTE DETECTOR's input
or the TRIG MODE and the level of the Compaire to level module. |
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Top Top
Joined: Feb 02, 2010
Posts: 266
Location: California
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Posted: Mon Apr 04, 2011 8:36 pm Post subject:
Re: Clocking from analog source through audio inputs?
Subject description: locking my nord with +12v cmos pulse clocked devices |
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| drapdap wrote: |
No! Don't do that! Could easily fry input circuitry! I hate that smell!
Audio level usually means no more than one volts, ac.
I've been clocking my Engine this way, but i used a voltage divider...
Also been clocking with the engine, than you have to boost the signal, say x10. Worked better this way, G2 as master, if you can sync yer cmos stuff from the outside. I bet you do...
read this:
http://www.cgs.synth.net/modules/cgs60v1_sba.html
and a voltage divider applet:
http://www.raltron.com/cust/tools/voltage_divider.asp
Do yourself a favour and don't kill the micro, the don't make them anymore, and i totally and badly miss mine despite having an expanded engine...
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Thanks. I was looking a little more into standard audio levels after reading that, and realizing they are normally a lot lower than a lot of my stuff is pushing out.
I regularly push +6V and more signals into DIY mixers and such, but definitely don't want to fry my nord.
I had thought about voltage dividers, and see I could do a 100K/10K combo and it would work well I think.
I was wondering though about whether it would load down the clock and make it not trigger other things also in the chain properly. I might need to build a simple buffer with regular input impedance and then load that one down with the voltage divider, giving the nord a dedicated clock source triggered from the master clock. I can just try it passively though and see what happens.
I was experimenting last night with syncing sequencers in the nord from an audio click track using an envelope follower and compare to level module, and it was working flawlessly. I have no doubt it will also sync easily to an external pulse.
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Top Top
Joined: Feb 02, 2010
Posts: 266
Location: California
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| Posted: Wed Apr 13, 2011 1:50 am Post subject:
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Hey, I did a 100K/10K voltage divider (which brings a 12v pulse down to roughly 1v).
It works great. Judging from the levels coming in, the audio inputs could easily tollerate a 3V or maybe even 5V pulse. I am sure that transients in audio signals sometimes reach that high.
I am using a compare level module on the input signal in order to set off a solid clocking pulse for some sequencers and such, and the 1V pulse is only tripping the compare to module when I bring the compare level down to around 10. Means the nord is able to see signals several times that amplitude. It works fine that way, but seems it could handle a stronger pulse as well.
Just as a comparison, when I was clocking from the headphone output of my computer playing a click track, it was easily tripping the compare to module even with it set all the way at the max of 64.
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