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/mr
Joined: Aug 05, 2007 Posts: 223 Location: Elektron City, Sweden
Audio files: 1
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Posted: Thu Mar 11, 2010 9:26 am Post subject:
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zthee wrote: | I'd like some feedback on this panel. |
Then just add a feedback knob!
zthee wrote: | frijitz wrote: |
Do you want to have both AC and DC coupling available for the Linear FM? |
What is the advantage of DC coupling the linear FM input? AC coupled will make it swing ±? Which is needed for that "original" FM sound? |
Standard FM sounds normally use AC coupling, since there should be no DC offset to maintain the pitch of the modulated oscillator.
Don't make it more complicated and confuse AC/DC coupling with ± swing! Both input types swing however you want, the AC coupling is just something that takes away any DC offset.
Awfully nice panel btw! |
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zthee
Joined: Feb 20, 2008 Posts: 414 Location: Stockholm
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Posted: Thu Mar 11, 2010 12:26 pm Post subject:
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Oh, that Gothenburg humor!
Well, i ment keeping the pitch with my ± sign. Eh. Need to get my terminology straight...
But what practical differences would it make? I.e. in what situations would I want to use a AC or a DC coupled linear FM input?
I can understand the concept of keeping the pitch.
I figured I could have the CV mod lin fm input to be AC coupled. And the other input DC coupled? _________________ http://www.thehumancomparator.net/ |
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Sound
Joined: Jun 06, 2006 Posts: 842
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Posted: Thu Mar 11, 2010 1:28 pm Post subject:
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DC coupled fm linear input will allow you set external linear initial level. |
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/mr
Joined: Aug 05, 2007 Posts: 223 Location: Elektron City, Sweden
Audio files: 1
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Posted: Fri Mar 12, 2010 4:35 am Post subject:
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zthee wrote: | I figured I could have the CV mod lin fm input to be AC coupled. And the other input DC coupled? |
Do it. Those are the connections you normally want. |
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frenchyinmunich
Joined: Jun 23, 2009 Posts: 113 Location: Germany
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Posted: Wed Apr 07, 2010 5:13 am Post subject:
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zthee wrote: |
I'd like some feedback on this panel.
And never mind the pitch scaling around the large knobs - it's for the graphics - not usefull
The Voltage Controlled Mod. Section is just a VCA connected to the lin. fm input. |
You are the Dude!
That one is really beautifull!!! The best to my taste.
The day you start some to do, please let me know.
Best,
F |
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Attorks
Joined: Jun 01, 2009 Posts: 6 Location: Netherlands
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Posted: Wed Apr 21, 2010 11:48 am Post subject:
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I have finished my TZ VCO 2 weeks ago from a full kit from the BrideChamber. Its a +/-15V version with the modifications from David Brown. Last night I noticed something strange. I what to know if you have the same experience or if its just me.
I have the CV out of my Doepfer MAQ16/3 to a mult. From this mult a cable goes to a DotCom Q106 VCO in the 1V/Oct input. Another cable goes the same way into a second Q106. A third cable goes into the 1V/Oct of the TZ VCO. I had this situation the last week and I noticed the scale was a little bit flat so I thought I had to calibrate the MAQ16/3 again. But last night I unplugged the cable from the TZ VCO and heard that tuning of the 2 Q106 VCO when some quarter semitone up and the scale MAQ is OK again. So it seems that the 1V/Oct input of the TZ VCO influences the CV coming from the sequencer or any CV. Does this sound familiar or is there something wrong with my TZ VCO? |
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astroschnautzer
Joined: May 22, 2008 Posts: 31 Location: FINLAND
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Posted: Wed Apr 21, 2010 12:02 pm Post subject:
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have you tried a buffered mult? This is a common problem if used 3 or more oscillators from the same source I have understood, the buffered mult should cure this... |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Wed Apr 21, 2010 1:16 pm Post subject:
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Attorks wrote: | I have the CV out of my Doepfer MAQ16/3 to a mult. From this mult a cable goes to a DotCom Q106 VCO in the 1V/Oct input. Another cable goes the same way into a second Q106. A third cable goes into the 1V/Oct of the TZ VCO. I had this situation the last week and I noticed the scale was a little bit flat so I thought I had to calibrate the MAQ16/3 again. But last night I unplugged the cable from the TZ VCO and heard that tuning of the 2 Q106 VCO when some quarter semitone up and the scale MAQ is OK again. So it seems that the 1V/Oct input of the TZ VCO influences the CV coming from the sequencer or any CV. Does this sound familiar or is there something wrong with my TZ VCO? |
The Teezer's V/O input is a standard 100k impedance. As long as you can calibrate it for 1V/Oct it is working properly. I have no idea what this MAQ is, but if it has a finite output impedance there will be some small loading, as is normal is most modular systems. Did you try unplugging one of the other units instead of the Teezer? You haven't isolated the problem properly unless you have done this, too. If the MAQ output is designed improperly, then yes, you might need to use a buffered multiple.
Ian |
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Attorks
Joined: Jun 01, 2009 Posts: 6 Location: Netherlands
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Posted: Wed Apr 21, 2010 2:21 pm Post subject:
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frijitz wrote: | The Teezer's V/O input is a standard 100k impedance. As long as you can calibrate it for 1V/Oct it is working properly. I have no idea what this MAQ is, but if it has a finite output impedance there will be some small loading, as is normal is most modular systems. Did you try unplugging one of the other units instead of the Teezer? You haven't isolated the problem properly unless you have done this, too. If the MAQ output is designed improperly, then yes, you might need to use a buffered multiple. |
I checked and I get the same sort of behaviour when unplugging an Q106 when a Q106 and TZ VCO are still connected. Also ruled out the MAQ16/3 by using a voltage from an LFO which gives the same behaviour. So I guess I have to find/build myself a buffered mult.
Sorry to spoil the bandwidth |
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Mark Space-Ratio
Joined: Dec 06, 2009 Posts: 28 Location: Sydenham, London
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Posted: Mon Apr 26, 2010 4:57 am Post subject:
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Attorks wrote: |
I have the CV out of my Doepfer MAQ16/3 to a mult. |
I had a problem last night running Schaltwerk CV into an Osc. Flat...My Schaltwerk is normally rack mounted and earthed through the rack(?). I had removed it from the rack and stood it on the wood cabinet, then used a single core patch cable and there I encountered the problem. I thought I had blown the CV side of the Schaltwerk as I plugged in the unit it was already switched on. I didn't seat the mains plug correctly so the Schaltwerk went on/off/on momentarily and I thought bang. I then thought 'earth' and replaced the single core with an earthed patch cable and it did the trick, pitch was back to normal. I ran the same CV out to a multi and no problem there. I am guessing MAQ has the same CV circuit that is in the Schaltwerk, with reduced number of outputs.
¬¬¬ |
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frenchyinmunich
Joined: Jun 23, 2009 Posts: 113 Location: Germany
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Posted: Wed Apr 28, 2010 4:19 am Post subject:
Where is Zthee |
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Hi,
I try to contact Zthee since 3 weeks.
Does someone have recently been in touch with him?
Regards,
F |
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Luka
Joined: Jun 29, 2007 Posts: 1003 Location: Melb.
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Posted: Sun May 23, 2010 5:29 am Post subject:
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i just went through the troubleshoot proceedure listed for sduck
interesting that neadrewthal swapped his lm311s and it worked, im using lm311H cans maybe that is it.
anyway this is the symptoms
output tri 5v (looks to have high oscillation or noisy signal on scope)
output sin -5v
output saw +5
the measurments
A1-7 (0.72 - 5.14 turning course freq)
A3-6 (-5 to +5 turning initial)
A2-6 4.8v
U2-2 1v-4v
U2-3 -11.3 - -10
U2-7 -0.53
D2/D3/r28 node -6.26
Q3/D3 node -0.54
A9-7 -10.76
A9-6 5.4V
hope that highlights the issue _________________ problemchild
melbourne australia
http://cycleofproblems.blogspot.com/
http://www.last.fm/user/prblmchild |
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Luka
Joined: Jun 29, 2007 Posts: 1003 Location: Melb.
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Fri Jun 04, 2010 2:05 pm Post subject:
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Luka wrote: | ...
the measurments
A1-7 (0.72 - 5.14 turning course freq)
A3-6 (-5 to +5 turning initial)
A2-6 4.8v
U2-2 1v-4v
U2-3 -11.3 - -10
U2-7 -0.53
D2/D3/r28 node -6.26
Q3/D3 node -0.54
A9-7 -10.76
A9-6 5.4V |
Sorry, I've been out of commission the past few weeks.
I can't understand your measurements -- some don't even seem possible.
Have you checked all the PS voltages, as given further above?
Ian |
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Luka
Joined: Jun 29, 2007 Posts: 1003 Location: Melb.
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Posted: Fri Jun 04, 2010 3:19 pm Post subject:
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yeah all the rail checks came through ok
which results in that list in particular dont make sense?
Last night after i made the message i plugged in my 2nd of 3 teezer pcbs using the same panel connectors and it seemed to be fully functioning. So i can eliminate wiring error and hopefully wrong components placement as i populated these 2 pcbs at the same time. _________________ problemchild
melbourne australia
http://cycleofproblems.blogspot.com/
http://www.last.fm/user/prblmchild |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Sat Jun 05, 2010 6:47 am Post subject:
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Luka wrote: | which results in that list in particular dont make sense? |
u2-2: I don't see how this could be varying with the frequency control.
u2-3: I don't see how this could possibly be near -11V. (u2 is powered by +/-7V, R29 is connected to +5V, etc.)
Sorry, this is completrely crazy.
Ian |
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Luka
Joined: Jun 29, 2007 Posts: 1003 Location: Melb.
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Posted: Sat Jun 05, 2010 3:12 pm Post subject:
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ok ill recheck those, thanks for pointing it out
i have 2 teezers operational now just this third one is giving me grief
i went around the pcb and checked resistors values with my DMM in comparison to the working one and they matched. also swapped all IC and transistors from dead one to living one and it seems they are not the problem _________________ problemchild
melbourne australia
http://cycleofproblems.blogspot.com/
http://www.last.fm/user/prblmchild |
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Argitoth
Joined: Jun 24, 2008 Posts: 152 Location: Gilbert, Arizona
Audio files: 3
G2 patch files: 6
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Posted: Sat Aug 21, 2010 3:40 pm Post subject:
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It seems like MOTM-300 VCO sync only reset with pulses. Is the Teezer the same way? |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Sun Aug 22, 2010 3:30 am Post subject:
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Argitoth wrote: | It seems like MOTM-300 VCO sync only reset with pulses. Is the Teezer the same way? |
No! The Teezer sync has a built-in pulser. It will sync to any signal that crosses 0.6 V from below. It's sync is also continuously variable from soft to hard.
Ian |
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/mr
Joined: Aug 05, 2007 Posts: 223 Location: Elektron City, Sweden
Audio files: 1
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Posted: Sun Aug 22, 2010 5:38 am Post subject:
Dual Teezer module? |
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Has anybody else than zthee thought about a dual version of the Teezer?
What obvious and non-obvious smart features and cross-connections (via switching jacks etc) would you include? |
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Argitoth
Joined: Jun 24, 2008 Posts: 152 Location: Gilbert, Arizona
Audio files: 3
G2 patch files: 6
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Posted: Sun Aug 22, 2010 8:00 am Post subject:
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I would love it if Teezer had PWM in and Pulse outputs (I've found so many uses for pulse/square waves lately... I'll list them!)
-high-speed VC clock for S&H effects
-For sync: creating "movement" in sound by modulating pulse width
-For sync: creating vibrato by modulating pulse width
-different FM-type and sync sounds with pulse widths
-creating a saw animator by mixing inversed saw + phase locked square and modulating pulse width
-using it to modulate the pitch of an oscillator up and down a precise octave
David Brown might be able to help me create a circuit for square/PWM to add to the Teezer, but I was wondering first... will the Teezer sync be pulse-width sensitive? And is there a way to use some of the sync circuit to make square/pwm circuit? |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Sun Aug 22, 2010 8:38 am Post subject:
Re: Dual Teezer module? |
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/mr wrote: | Has anybody else than zthee thought about a dual version of the Teezer?
What obvious and non-obvious smart features and cross-connections (via switching jacks etc) would you include? |
Well, yes! Scott at bridechamber and I are working on a dual version in euro format. I wanted to do it without changing the board layout significantly, so I just shrunk it down a bit and added the extra power connector. Scott is working on the challenge of designing mounting brackets -- it's going to be a tight squeeze.
We haven't talked about cross-connections yet, but it seems to me it would be easy to normalize some connections on the panel, without changing the board.
Ian |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Sun Aug 22, 2010 9:07 am Post subject:
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Argitoth wrote: | I would love it if Teezer had PWM in and Pulse outputs... |
Sorry, that's not gonna happen. I appreciate the usefulness of it, but I really suggest using a separate waveshaper module.
Quote: | David Brown might be able to help me create a circuit for square/PWM to add to the Teezer, but I was wondering first... will the Teezer sync be pulse-width sensitive? And is there a way to use some of the sync circuit to make square/pwm circuit? |
Yes, it would be easy to make a little perfboard add-on.
The sync circuit has its own pulse generator at the input and triggers off the upward-going signal transition across a 0.6V threshold. So no, you cannot vary its phase.
There is a pulse wave internal to the sync circuit (driven by the oscillator's Tri signal). It's part of the variable-sync circuit, so it isn't voltage controllable.
Thanks for your interest! I like all your ideas and suggestions, but the circuit is already fairly complex, and we've been trying to keep the price down by not adding a lot of extra features.
Ian |
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/mr
Joined: Aug 05, 2007 Posts: 223 Location: Elektron City, Sweden
Audio files: 1
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Posted: Sun Aug 22, 2010 9:28 am Post subject:
Re: Dual Teezer module? |
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frijitz wrote: | /mr wrote: | Has anybody else than zthee thought about a dual version of the Teezer? |
Well, yes! Scott at bridechamber and I are working on a dual version in euro format. |
Cool!
frijitz wrote: | We haven't talked about cross-connections yet, but it seems to me it would be easy to normalize some connections on the panel, without changing the board. |
Common CV inputs is perhaps the most obvious, but the "smarter" connections for intermodulations would be preferable to do via VCAs, I guess... |
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Funky40
Joined: Sep 24, 2005 Posts: 875 Location: Swiss
Audio files: 1
G2 patch files: 5
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Posted: Fri Aug 27, 2010 2:34 pm Post subject:
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I never found it more interesting or musical to patch two teezers than a teezer and another highfrequenzyrange VCO.
what i miss on my teezers is the option of presettable offsetranges.
If i would build again, i would have the manual offsetknob, AND also switchable offsets.
could be: 0V / 0.1V / 0.2V ( as ZO ) / (0.5V?) / 1V (as ZO) / (2V?) / and definitly also 5V !!!
never wanted to miss the mutejacks on ALL CV inputs !! especially on a TZ VCO
one reason why i hate manufactured VCOs.
never wanted to miss multiple outputjacks !!
the next reason why i hate manufactured VCOs
Teeser and 5pulser are a very nice Team. shit, never made that demos, sorry |
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