| Would you prefer one PCB with 3 VCOs a la JH-5A, or 1 VCO per PCB with more features |
| One PCB with Oscillator Driver and 3 VCO cores (like JH-5A - cheap!) |
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60% |
[ 62 ] |
| 1 PCB = 1 VCO (with many waveforms and inputs) |
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39% |
[ 41 ] |
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| Total Votes : 103 |
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bennethos
Joined: Apr 18, 2009
Posts: 31
Location: Belgium
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 Posted: Tue Feb 16, 2010 2:08 am Post subject:
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I solved my problem yesterday evening, as Juergen said "it's a silly problem most of the time" and he was right.
I actually inserted 1 wrong capacitor, the one between the base of the transistor and input of the comparator. 33KpF instead of 22pF
My saw waveform had a dip when it started and when my 10 turn was fully open (no resistance) I had a half trapezium :p .
on vco 2, pin 2 of the TL072 made no contact to anything this gave +14v at the first output of the TL which was not OK, made a little bridge and that solved it as well 
can't wait to test those *beasts* Smile |
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bennethos
Joined: Apr 18, 2009
Posts: 31
Location: Belgium
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| Posted: Thu Feb 18, 2010 12:16 pm Post subject:
L vco |
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Hey Guys,
it's the noob again .
I tested my L VCO'S yesterday evening but I only have 3v pk-pk on each L vco on my scope. My Analogue systems VCO has 10v pk-pk.
I have no CV source attached to the L vco though...
Is this normal ?
btw
the linear detuning is beatifull, I kept on my headphones for 15 min with that same sound just too hear them pound (passed it through an EQ to pump up the low frequencies a bit, amazing) |
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numbertalk
Joined: May 05, 2008
Posts: 992
Location: Austin, TX
Audio files: 5
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| Posted: Thu Feb 18, 2010 12:25 pm Post subject:
Re: L vco |
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Did you wire up the output amplifier section:
http://www.jhaible.de/living_vcos/living_vcos_wiring_opt3.pdf
| bennethos wrote: | Hey Guys,
it's the noob again .
I tested my L VCO'S yesterday evening but I only have 3v pk-pk on each L vco on my scope. My Analogue systems VCO has 10v pk-pk.
I have no CV source attached to the L vco though...
Is this normal ?
btw
the linear detuning is beatifull, I kept on my headphones for 15 min with that same sound just too hear them pound (passed it through an EQ to pump up the low frequencies a bit, amazing) |
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bennethos
Joined: Apr 18, 2009
Posts: 31
Location: Belgium
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Posted: Thu Feb 18, 2010 1:16 pm Post subject:
Subject description: l vco amplitude |
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Thx, first project for me so I'm overlooking a lot of things... but i'm a fast learner and this stuff is exciting
Just wired it up, the scope shows 5v now, but it's still too quite when I pass it through the AS VCA.
What I don't get compared to my analogue systems VCO :
- the AS vco goes from -1,3 to +8,8v on the scope
- the L vco goes from -5 to +5 ... this probably explains the difference in volume I get... |
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nerdware
Joined: Jul 11, 2009
Posts: 91
Location: UK
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| Posted: Thu Feb 18, 2010 2:17 pm Post subject:
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±5V is normal for most VCOs, but the AS VCOs are different. Their website says | Quote: | | The output from the SQR-OUT socket is approximately ±5V. |
It also says | Quote: | | The output from the SAW-OUT socket is -2V to +8V when a true sawtooth wave is produced, and ±2.5V when a triangle wave is produced. |
So your LVCO looks good to me. Just accept that AS do it differently.
_________________
http://soundcloud.com/nerdware/
"render unto digital what is due to digital, render unto analogue what is due to analogue" |
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Thu Feb 18, 2010 3:12 pm Post subject:
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You can always change the gain of the amplifiers to get other levels. It's jut one resistor per VCO that would have to be changed.
With the values printed on the PCB, you get +/-5V, which is a widely used standard.
The VCO outputs themselves (without the amps) are approx. Moog Modular level.
JH.
_________________
"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f) |
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bennethos
Joined: Apr 18, 2009
Posts: 31
Location: Belgium
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| Posted: Fri Feb 19, 2010 12:59 am Post subject:
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| thx a lot to you both ! I really have to do more reading |
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sinneb
Joined: Jan 22, 2010
Posts: 3
Location: juno-base
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Fri Mar 12, 2010 1:56 am Post subject:
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It's probably an artefact from your measurement setup.
My guess is: High bandwidth of the scope, connected with a long, un-terminated wire.
JH.
_________________
"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f) |
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davebr
Joined: Jun 09, 2007
Posts: 198
Location: portland, or
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| Posted: Fri Mar 12, 2010 10:01 am Post subject:
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| sinneb wrote: | Just finished one living VCO core and the driver module. Sound great already but I have a question regarding the generated sawtooth. I connected a software oscilloscope and the sawtooth is showing spikes. Is that normal? Or should I check the various components? Since I'm a n00b  - could use some suggestions. TIA! |
I was going to suggest the same issue with this being an artifact of the probe. However, your ramp waveform looks like it is +8 to -10, or 18 volts pk-pk. Did you want your output that 'hot'. I would have expected something less.
Dave |
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Fri Mar 12, 2010 2:27 pm Post subject:
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Oh - I didn't look at the scale. Should be +/-5V after the amp, not more.
JH.
_________________
"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f) |
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sinneb
Joined: Jan 22, 2010
Posts: 3
Location: juno-base
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| Posted: Sat Mar 13, 2010 4:37 am Post subject:
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| thx! I connected the oscilloscope to the rightmost pin of the SAW_n connector so the graph should be showing the 0 ... 10V saw from the VCO core. Anyways, I'll start working on the other cores. compare the different outputs and report my findings back here. |
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sinneb
Joined: Jan 22, 2010
Posts: 3
Location: juno-base
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vtl5c3
Joined: Sep 08, 2006
Posts: 425
Location: PDX
Audio files: 13
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| Posted: Tue Mar 23, 2010 2:28 pm Post subject:
Fine vs. Detune? |
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I'm finally getting around to laying out a front panel. I'm used to VCOs having a 'Fine' frequency pot. What I'm not used to is 'Detune'. Is it redundant to have both?
R. |
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Wed Mar 24, 2010 1:59 am Post subject:
Re: Fine vs. Detune? |
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| vtl5c3 wrote: | I'm finally getting around to laying out a front panel. I'm used to VCOs having a 'Fine' frequency pot. What I'm not used to is 'Detune'. Is it redundant to have both?
R. |
The Living VCOs use Multi-Turn potentiometers instead of separate coarse/fine tuning. (You could replace the multiturn with two pots and an extra resistor, of course.)
The Linear Detune knob is entirely different, and it's one of the main features of the whole thing.
JH.
_________________
"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f) |
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vtl5c3
Joined: Sep 08, 2006
Posts: 425
Location: PDX
Audio files: 13
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| Posted: Wed Mar 24, 2010 7:48 pm Post subject:
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OK, thanks. Just wanted to be sure before committing to a panel layout.
R> |
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davebr
Joined: Jun 09, 2007
Posts: 198
Location: portland, or
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| Posted: Wed Mar 24, 2010 8:41 pm Post subject:
Re: Fine vs. Detune? |
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| jhaible wrote: | | vtl5c3 wrote: | I'm finally getting around to laying out a front panel. I'm used to VCOs having a 'Fine' frequency pot. What I'm not used to is 'Detune'. Is it redundant to have both?
R. |
The Living VCOs use Multi-Turn potentiometers instead of separate coarse/fine tuning. (You could replace the multiturn with two pots and an extra resistor, of course.)
The Linear Detune knob is entirely different, and it's one of the main features of the whole thing.
JH. |
I did mine with coarse and fine controls and also the detune controls. As mentioned, the detune controls work differently from the fine and are a key feature. I did only implement detune on VCO2 and VCO3, though.
There is a video of the detune controls in operation on my site.
http://modularsynthesis.com/jhaible/lvcos/jhlvcos.htm
Dave |
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oozitron
Joined: Apr 02, 2007
Posts: 38
Location: USA
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| Posted: Sun Apr 04, 2010 2:45 pm Post subject:
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Hello -
I'm ready to wire up and fire up my VCOs but suddenly realized I only have 3 100k pots! D'oh!!!
I have a bunch of 50k at the moment, and of course I'll order more 100k pots, but for *right now* are there any of the controls (vib rate, vib amt, pw, pwm, fm) that really have to be 100k, or can I use the 50k thingers until the correct ones arrive?
Desparately Seeking Sawtooths,
Drew |
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Mon Apr 05, 2010 1:06 am Post subject:
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| oozitron wrote: | Hello -
I'm ready to wire up and fire up my VCOs but suddenly realized I only have 3 100k pots! D'oh!!!
I have a bunch of 50k at the moment, and of course I'll order more 100k pots, but for *right now* are there any of the controls (vib rate, vib amt, pw, pwm, fm) that really have to be 100k, or can I use the 50k thingers until the correct ones arrive?
Desparately Seeking Sawtooths,
Drew |
50k will be ok.
log pots will give a strange response, but will work electrically.
Make sure you replace them with lin pots eventually.
JH.
_________________
"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f) |
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oozitron
Joined: Apr 02, 2007
Posts: 38
Location: USA
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| Posted: Wed Apr 07, 2010 8:36 pm Post subject:
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I am confused about the CVS and DRVOUT connections.
I have the CVS normalled (the CVS square hole to the CVS middle hole) since nothing is plugged into the CVS jack.
At the "round hole" of DRV OUT there is +13.5 volts, even if I insert a patch cable and apply at the CVS in jack. Is that normal?
From the wiring examples, I thought that the DRVOUT would take the voltage from the CVS in jack and distribute it to the CVs_1, CVs_2 and CVs_3. But it always is +13.5 volts (???)
huge thanks for any insight,
Drew |
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Thu Apr 08, 2010 1:36 am Post subject:
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| oozitron wrote: | I am confused about the CVS and DRVOUT connections.
I have the CVS normalled (the CVS square hole to the CVS middle hole) since nothing is plugged into the CVS jack.
At the "round hole" of DRV OUT there is +13.5 volts, even if I insert a patch cable and apply at the CVS in jack. Is that normal?
From the wiring examples, I thought that the DRVOUT would take the voltage from the CVS in jack and distribute it to the CVs_1, CVs_2 and CVs_3. But it always is +13.5 volts (???)
huge thanks for any insight,
Drew |
Have you connected th eportamento pot already?
JH.
_________________
"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f) |
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oozitron
Joined: Apr 02, 2007
Posts: 38
Location: USA
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| Posted: Thu Apr 08, 2010 10:38 am Post subject:
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Yes, that was the issue 
I lucked out today... the school where I work had a sewer line break so no school!!! A whole day of quiet empty house to work!
I hooked up VCO1 and it just sounds awesome. Currently working on the wiring for the other two. Can't wait to hear them all at once!
Thanks again Jurgen for the help and the amazing circuit 
Drew |
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frenchyinmunich
Joined: Jun 23, 2009
Posts: 115
Location: Germany
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| Posted: Tue Apr 20, 2010 3:35 am Post subject:
Components list Reichelt |
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Hello,
Did someone already did the Reichlet's list for that module?
Best regards,
F |
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norman phay
Joined: Jun 29, 2007
Posts: 176
Location: North-East England
Audio files: 1
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| Posted: Sun Apr 25, 2010 10:11 am Post subject:
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| I got my first one of these all hooked up & running, couple of minor problems - one of the multi-turn pots I bought it faulty! I'll order some more next week. Also, the LFO depth knob only seems to have any effect in the last 1/4 turn of its travel (it is a lin pot, i checked) So I have to take a, look at that, but I must say, just running 2 VCOs, wow it does sound very rich and nice! Once again, many thanks for designing these and making them available to us all... |
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Sun Apr 25, 2010 10:49 am Post subject:
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| Norman Phay wrote: | | I got my first one of these all hooked up & running, couple of minor problems - one of the multi-turn pots I bought it faulty! I'll order some more next week. Also, the LFO depth knob only seems to have any effect in the last 1/4 turn of its travel (it is a lin pot, i checked) So I have to take a, look at that, but I must say, just running 2 VCOs, wow it does sound very rich and nice! Once again, many thanks for designing these and making them available to us all... |
The behaviour of the vibrato depth pot is intentional - I think I have written about it earlier in this thread. Once you read about the idea behind it, you'll like it that way!
JH.
_________________
"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f) |
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