| Would you buy a Jh Trapezoid VCA PCB? |
| no - only interested in the original EMS circuit (this is not goint to happen - sorry) |
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2% |
[ 1 ] |
| yes - if it emulates the behaviour of the EMS circuit, and doesn't need component selecting |
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97% |
[ 40 ] |
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| Total Votes : 41 |
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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 Posted: Sun Jul 25, 2010 10:09 am Post subject:
Trapezoid VCA anybody? |
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I wonder how many interest there would be in a Trapezoid VCA PCB.
It would - of course - be designed to emulate the behaviour of the famous EMS Synthi A and VCS3 Trapezoid, and it would be - of course - not be a direct copy of the EMS circuit.
Let me know.
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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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Sun Jul 25, 2010 11:33 am Post subject:
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http://www.youtube.com/watch?v=MlIKIr3Ef5c
http://www.jhaible.de/trapezoid/jh_trapezoid_vca_1.mp3
Quick and dirty demo.
Farfisa VIP 500 thru the Trapezoid VCA + Phaser + BBD Delay
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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StephenGiles
Joined: Apr 17, 2006
Posts: 507
Location: England
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Adam-V
Joined: Jan 29, 2007
Posts: 300
Location: Australia
Audio files: 1
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| Posted: Sun Jul 25, 2010 5:07 pm Post subject:
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Making this one available would be just brilliant Jürgen.
Would the trapezoid signal be made externally available for use as a CV source for things other than the VCA?
Cheers,
Adam-V
_________________
Digitalis Effect | Fractured Symmetry (www.spiralsect.com) |
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Sun Jul 25, 2010 10:44 pm Post subject:
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| Adam-V wrote: |
Would the trapezoid signal be made externally available for use as a CV source for things other than the VCA?
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Yes, absolutely.
Positive and negative, and you choose the peak output voltage.
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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diablojoy
Joined: Sep 07, 2008
Posts: 809
Location: melbourne australia
Audio files: 11
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| Posted: Sun Jul 25, 2010 10:58 pm Post subject:
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nice  i would want at least 2 i think |
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TekniK
Joined: Aug 10, 2008
Posts: 1059
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| Posted: Sun Jul 25, 2010 11:22 pm Post subject:
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| what is it exactly,a pcb with vca + AR generator? |
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Adam-V
Joined: Jan 29, 2007
Posts: 300
Location: Australia
Audio files: 1
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| Posted: Sun Jul 25, 2010 11:39 pm Post subject:
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| jhaible wrote: | | Adam-V wrote: |
Would the trapezoid signal be made externally available for use as a CV source for things other than the VCA?
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Yes, absolutely.
Positive and negative, and you choose the peak output voltage.
JH. |
Brilliant!!!!! I'd be up for a number of them then.
Cheers,
Adam-V
_________________
Digitalis Effect | Fractured Symmetry (www.spiralsect.com) |
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a100user
Joined: Oct 28, 2003
Posts: 158
Location: UK
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| Posted: Mon Jul 26, 2010 1:06 am Post subject:
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Interested indeed Jurgen
David |
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jumunius
Joined: Apr 19, 2010
Posts: 346
Location: San Francisco, CA
Audio files: 13
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| Posted: Mon Jul 26, 2010 11:19 am Post subject:
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| Yes, one please! |
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v-un-v
Janitor
Joined: May 16, 2005
Posts: 8932
Location: Birmingham, England, UK
Audio files: 11
G2 patch files: 1
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| Posted: Tue Jul 27, 2010 12:36 pm Post subject:
Re: Trapezoid VCA anybody? |
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| jhaible wrote: |
It would - of course - be designed to emulate the behaviour of the famous EMS Synthi A and VCS3 Trapezoid, and it would be - of course - not be a direct copy of the EMS circuit. |
Of course when you put it like that, it's a YES-YES situation!
YES! 
_________________
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ALLES TURISTEN UND NONTEKNISCHEN LOOKENPEEPERS!
DAS KOMPUTERMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKSEN.
IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN. |
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v-un-v
Janitor
Joined: May 16, 2005
Posts: 8932
Location: Birmingham, England, UK
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| Posted: Tue Jul 27, 2010 12:42 pm Post subject:
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| TekniK wrote: | | what is it exactly,a pcb with vca + AR generator? |
Do your homework!  
The EMS trapezoid ain't no simple AR generator!!
_________________
ACHTUNG!
ALLES TURISTEN UND NONTEKNISCHEN LOOKENPEEPERS!
DAS KOMPUTERMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKSEN.
IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN. |
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TekniK
Joined: Aug 10, 2008
Posts: 1059
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| Posted: Tue Jul 27, 2010 12:47 pm Post subject:
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| v-un-v wrote: | | TekniK wrote: | | what is it exactly,a pcb with vca + AR generator? |
Do your homework!
The EMS trapezoid ain't no simple AR generator!! |
what is it then thats its so special? |
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numbertalk
Joined: May 05, 2008
Posts: 992
Location: Austin, TX
Audio files: 5
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| Posted: Tue Jul 27, 2010 12:54 pm Post subject:
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| Count me in for 1 |
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ejr27233
Joined: Feb 08, 2010
Posts: 52
Location: UK
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| Posted: Tue Jul 27, 2010 1:00 pm Post subject:
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| I'd be in for 2 PCB's |
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Tue Jul 27, 2010 1:20 pm Post subject:
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| TekniK wrote: | | what is it then thats its so special? |
Hard to explain.
When I build that Synthi Clone, I thought a single, restricted envelope like that would hardly be enough for a synthesizer. So I added a Hold-ADSR envelope.
More than 10 years later, a cannot remember a single occasion when I made use of that HADSR. I always used the Trapezoid.
(This applies to FX sounds and to modulating external signals only. Playing melodies asks for an ADSR.)
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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TekniK
Joined: Aug 10, 2008
Posts: 1059
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| Posted: Tue Jul 27, 2010 1:52 pm Post subject:
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ok,and does this vca design add some smoothness or something to the sound.
Your YT demo sounds nice,but its just because of the AR effect or? |
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v-un-v
Janitor
Joined: May 16, 2005
Posts: 8932
Location: Birmingham, England, UK
Audio files: 11
G2 patch files: 1
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| Posted: Tue Jul 27, 2010 2:18 pm Post subject:
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| jhaible wrote: |
When I build that Synthi Clone, I thought a single, restricted envelope like that would hardly be enough for a synthesizer. So I added a Hold-ADSR envelope.
More than 10 years later, a cannot remember a single occasion when I made use of that HADSR. I always used the Trapezoid.
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It's funny JH, because I actually DID always wonder why you did this. Now I know!
_________________
ACHTUNG!
ALLES TURISTEN UND NONTEKNISCHEN LOOKENPEEPERS!
DAS KOMPUTERMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKSEN.
IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN. |
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ian-s
Joined: Apr 01, 2004
Posts: 2672
Location: Auckland, New Zealand
Audio files: 42
G2 patch files: 626
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| Posted: Tue Jul 27, 2010 4:19 pm Post subject:
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| v-un-v wrote: | | jhaible wrote: |
When I build that Synthi Clone, I thought a single, restricted envelope like that would hardly be enough for a synthesizer. So I added a Hold-ADSR envelope.
More than 10 years later, a cannot remember a single occasion when I made use of that HADSR. I always used the Trapezoid.
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It's funny JH, because I actually DID always wonder why you did this. Now I know! |
Having an envelope that can sustain for as long as a key is held can be useful sometimes. How about a modification so that the hold time control could be switched to 'Gate' mode? |
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Tue Jul 27, 2010 10:16 pm Post subject:
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| ian-s wrote: | | v-un-v wrote: | | jhaible wrote: |
When I build that Synthi Clone, I thought a single, restricted envelope like that would hardly be enough for a synthesizer. So I added a Hold-ADSR envelope.
More than 10 years later, a cannot remember a single occasion when I made use of that HADSR. I always used the Trapezoid.
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It's funny JH, because I actually DID always wonder why you did this. Now I know! |
Having an envelope that can sustain for as long as a key is held can be useful sometimes. How about a modification so that the hold time control could be switched to 'Gate' mode? |
That's already in there. Standard Gate and / or Switch trigger input.
The On-Time parameter is important for the auto-cycle mode, not so much for the gated mode.
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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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Wed Jul 28, 2010 2:04 am Post subject:
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Is there a standard for +/-12V connectors?
Or are they alle different?
Could anyone point me to dimensional drawings and pinout of the most common +/-12V connectors, please?
Thanks
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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a100user
Joined: Oct 28, 2003
Posts: 158
Location: UK
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Wed Jul 28, 2010 2:46 am Post subject:
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Thank you - I'll go for the 10-pin version then.
How many space does it need around the actual footprint?
Best let me know the size of the whole rectangele to be left free on the board ...
First time I ever integrate a D connector on one of my boards.
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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a100user
Joined: Oct 28, 2003
Posts: 158
Location: UK
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| Posted: Wed Jul 28, 2010 3:06 am Post subject:
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I don't have a module here at the moment but the ribbon headers are quite low profile so you could probably get away with 5mm all round the pins.
I believe this is the correct spec for the 16 pin version
http://www.farnell.com/cad/308052.pdf
Some folks use this type as it's polorized and prevents them plugging the module the wrong way round |
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jhaible
Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24
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| Posted: Wed Jul 28, 2010 3:12 am Post subject:
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Thank you!
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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