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LektroiD
Joined: Aug 23, 2008 Posts: 1018 Location: Scottish Borders
Audio files: 2
G2 patch files: 2
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Posted: Sun Oct 31, 2010 2:04 pm Post subject:
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To my ear, it sounds more like it is mixing the signals, rather than multiplying them.. There is always a signal bleeding from both modulator and carrier inputs. My understanding of a ring modulator, is that both the carrier and modulator should remain silent until they are modulated by each other?
Also there's no calibration procedure in the docs, perhaps this is where I'm going wrong?
First I tried two square waves, and offset the modulator frequency. Secondly I used a drum machine for the carrier. It certainly modulates, but doesn't sound anything like a classic ring circuit. Maybe I'm doing something wrong here? I will do some more experimenting _________________ LektroiD |
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adambee7
Joined: Apr 04, 2009 Posts: 420 Location: united kingdom
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Posted: Mon Nov 01, 2010 11:44 am Post subject:
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pcbs arrived. cheers matthias. |
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numbertalk
Joined: May 05, 2008 Posts: 992 Location: Austin, TX
Audio files: 5
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Posted: Mon Nov 01, 2010 11:46 am Post subject:
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Board made it to NYC, thanks! |
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emdot_ambient
Joined: Nov 22, 2009 Posts: 667 Location: Frederick, MD
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Posted: Mon Nov 01, 2010 12:28 pm Post subject:
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My wife tells me the boards have arrived. Thanks! |
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softfin
Joined: Oct 11, 2006 Posts: 271 Location: Far in the north
Audio files: 1
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Posted: Mon Nov 01, 2010 12:57 pm Post subject:
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A pair of red boards arrived today, |
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kkissinger
Joined: Mar 28, 2006 Posts: 1353 Location: Kansas City, Mo USA
Audio files: 41
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Posted: Mon Nov 01, 2010 2:03 pm Post subject:
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LektroiD wrote: | To my ear, it sounds more like it is mixing the signals, rather than multiplying them.. There is always a signal bleeding from both modulator and carrier inputs. My understanding of a ring modulator, is that both the carrier and modulator should remain silent until they are modulated by each other?
Also there's no calibration procedure in the docs, perhaps this is where I'm going wrong?
First I tried two square waves, and offset the modulator frequency. Secondly I used a drum machine for the carrier. It certainly modulates, but doesn't sound anything like a classic ring circuit. Maybe I'm doing something wrong here? I will do some more experimenting |
If either of your signals has a DC offset, then you will get bleedthru.
You want to be sure that the CV input voltage is not causing a DC offset. Also, you want to be sure that your input signals have no DC offset.
A square wave that is 0v to 10v will have (in effect) a 5v DC offset. _________________ -- Kevin
http://kevinkissinger.com |
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fonik
Joined: Jun 07, 2006 Posts: 3950 Location: Germany
Audio files: 23
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Posted: Mon Nov 01, 2010 3:42 pm Post subject:
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LektroiD wrote: | Also there's no calibration procedure in the docs, perhaps this is where I'm going wrong? |
will follow.
for now:
if you don't have a scope - don't apply any signal to any input. turn all pots down. turn input 1 pot up (still no signal at the input!), use trimpot to get 0V at test point TP1. then same for 2nd input.
if you have a scope - apply a signal to channel 1, input pot all up. use trimpot to move signal centered around 0V. _________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source |
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Danno Gee Ray
Joined: Sep 25, 2005 Posts: 1351 Location: Telford, PA USA
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Posted: Mon Nov 01, 2010 3:54 pm Post subject:
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Got my boards today as well. |
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jksuperstar
Joined: Aug 20, 2004 Posts: 2503 Location: Denver
Audio files: 1
G2 patch files: 18
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Posted: Mon Nov 01, 2010 7:46 pm Post subject:
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Arrived! Thanks!!! |
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bugfight
Joined: Aug 02, 2007 Posts: 188 Location: Arlington, TX USA
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Posted: Mon Nov 01, 2010 10:02 pm Post subject:
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gots mine, thanks again again! |
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a100user
Joined: Oct 28, 2003 Posts: 158 Location: UK
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Posted: Tue Nov 02, 2010 12:44 am Post subject:
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Boards arrived
Thanks Matthias
David |
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Luka
Joined: Jun 29, 2007 Posts: 1003 Location: Melb.
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Dego
Joined: Apr 22, 2008 Posts: 139 Location: Sweden
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Posted: Thu Nov 04, 2010 4:28 am Post subject:
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got mine last week |
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kkissinger
Joined: Mar 28, 2006 Posts: 1353 Location: Kansas City, Mo USA
Audio files: 41
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Posted: Thu Nov 04, 2010 10:16 am Post subject:
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My board arrived, too. Look forward to building this. Thanks! _________________ -- Kevin
http://kevinkissinger.com |
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diablojoy
Joined: Sep 07, 2008 Posts: 809 Location: melbourne australia
Audio files: 11
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Posted: Thu Nov 04, 2010 5:33 pm Post subject:
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boards arrived in oz thanks mathias |
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Adam-V
Joined: Jan 29, 2007 Posts: 300 Location: Australia
Audio files: 1
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Posted: Mon Nov 08, 2010 7:38 pm Post subject:
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My boards have arrived too Matthias. Thanks again.
Cheers,
Adam-V _________________ Digitalis Effect | Fractured Symmetry (www.spiralsect.com) |
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slo
Joined: Feb 18, 2007 Posts: 204 Location: Victoria, BC
Audio files: 1
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Posted: Wed Nov 10, 2010 6:52 pm Post subject:
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Board arrived in Canada
George |
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jumunius
Joined: Apr 19, 2010 Posts: 346 Location: San Francisco, CA
Audio files: 13
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Posted: Fri Nov 12, 2010 1:00 pm Post subject:
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LektroiD wrote: | I'm now wondering how to do a 5U for this, If I do standard MOTM 1U, I'll have nowhere to put the extra socket, and it seems a little wasteful to use a 2U panel just to accommodate 1 extra socket. I may have to use smaller rotary knobs and place the sockets next to each of those
Any other 5U guys out there building this? |
I'm going to do a 2u and fill out the space with either one of Nicolas' simple VCOs or simple LFOs, as either would be useful on its own, as well as in conjunction with a VC Ring. |
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kkissinger
Joined: Mar 28, 2006 Posts: 1353 Location: Kansas City, Mo USA
Audio files: 41
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Posted: Mon Nov 15, 2010 9:29 am Post subject:
Powered up the VC RingMod last night |
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Powered it up and got sound out of it! ** Hooray!! **
Both VCA's work ok. The Carrier signal is ok. The Modulator signal is clipped though ... so, I have some troubleshooting to do. I can already see that this will be a fine addition to my synthesizer.
I'll post a pic once it is finished -- as tempting as it is to post a pic, I wait until everything works to spec before I do the show 'n tell thing. _________________ -- Kevin
http://kevinkissinger.com |
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emdot_ambient
Joined: Nov 22, 2009 Posts: 667 Location: Frederick, MD
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Posted: Mon Nov 15, 2010 12:41 pm Post subject:
Re: Powered up the VC RingMod last night |
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kkissinger wrote: | I'll post a pic once it is finished |
And sound samples! |
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fonik
Joined: Jun 07, 2006 Posts: 3950 Location: Germany
Audio files: 23
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Posted: Mon Nov 15, 2010 3:40 pm Post subject:
Re: Powered up the VC RingMod last night |
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kkissinger wrote: | Both VCA's work ok. The Carrier signal is ok. The Modulator signal is clipped though ... so, I have some troubleshooting to do. |
does it clip at the testpiont TP2, or does it clip at the output? latter would be the feature, not a bug. _________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source |
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mono-poly
Joined: Jul 07, 2004 Posts: 937 Location: Rotterdam, Netherlands
Audio files: 2
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Posted: Tue Nov 16, 2010 6:29 am Post subject:
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I still want the euro version Matthias |
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kkissinger
Joined: Mar 28, 2006 Posts: 1353 Location: Kansas City, Mo USA
Audio files: 41
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Posted: Tue Nov 16, 2010 7:17 am Post subject:
Re: Powered up the VC RingMod last night |
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fonik wrote: | kkissinger wrote: | Both VCA's work ok. The Carrier signal is ok. The Modulator signal is clipped though ... so, I have some troubleshooting to do. |
does it clip at the testpiont TP2, or does it clip at the output? latter would be the feature, not a bug. |
Thank you for your comment. The waveform is not clipped at TP2 and TP1.
I checked and re-checked the polarity of the diodes and verified that the op amp is working correctly. Thank you for verifying that the module is working to spec.
I will get some sound examples up soon. Stay tuned... _________________ -- Kevin
http://kevinkissinger.com |
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kkissinger
Joined: Mar 28, 2006 Posts: 1353 Location: Kansas City, Mo USA
Audio files: 41
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Posted: Thu Nov 18, 2010 9:30 pm Post subject:
VC Ring Modulator MP3 Demo Track |
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I just recorded a demo and a short improv with this module.
One adjusts the signal levels (the carrier and modulator -- X and Y) to null out the primary input signals.
Since the Voltage control varies the X and Y levels, external voltage can control the nulling effect ("bleed through") and effect some amplitude modulation, too.
I labeled the inputs X and Y to match the Aries labeling (used for the Aries Balanced Modulator).
Description: |
The VC Ring Mod didn't utilize all of the Aries 9x3 panel, so I added a separate Gain/Bias function to the module. |
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Filesize: |
1.29 MB |
Viewed: |
481 Time(s) |
This image has been reduced to fit the page. Click on it to enlarge. |
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Description: |
This view shows the VC Ring Mod PCB |
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Filesize: |
1.6 MB |
Viewed: |
426 Time(s) |
This image has been reduced to fit the page. Click on it to enlarge. |
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Description: |
This view shows the Gain/Level Shifter PCB. |
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Filesize: |
1.56 MB |
Viewed: |
428 Time(s) |
This image has been reduced to fit the page. Click on it to enlarge. |
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Description: |
Demonstration and short improv with the Fonitronics mh31 Voltage Controlled Ring Modulator |
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Download |
Filename: |
VC Ring Modulator Demo.mp3 |
Filesize: |
5.78 MB |
Downloaded: |
1628 Time(s) |
_________________ -- Kevin
http://kevinkissinger.com |
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fonik
Joined: Jun 07, 2006 Posts: 3950 Location: Germany
Audio files: 23
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Posted: Fri Nov 19, 2010 4:47 am Post subject:
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that demonstration is awesome!
BTW did you try the VCmodulator for control voltages as well? _________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source |
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