Doepfer

hi all,
  
the important (and relevant to Doepfer A100) question:
 
since it looks like (to my ignorant eyes) that the SH7 
'pedal vcf input' (seems to be powered) works like a simple variable resistor (i guess that i can 
simply connect a variable resistor to this input to change the filter cutoff), 
could i use the Doepfer A101-9 Universal Vactrol module, to 
operate the SH7 filter without any modification to the synth? (using the 'vac 
out' connected to the SH7 'pedal vcf input')
 
here is the link to that module:
http://www.doepfer.de/A1019.htm

here is a link to the SH7 service manual (thanks 
CEM3374 !) :

http://www.cem3374.com/docs/Manuals/Roland/SH-7_SM.pdf




(check page 24 and the vcf circuit page, to see how 
the pedal input is...)

if this cannot be done, any help on converting the SH7 pedal vcf input to a regular cv input?


many thanks in advance for your help!
 
best regards,     :-)
Bakis.
 

Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist

[Doepfer_a100] group owner

www. parallel - worlds - music. com

www. facebook. com/ pages/Parallel-Worlds/192093934136476

www. myspace. com/ parallelworldsmusic

www. myspace. com/ interconnectedmusic

www. myspace. com/ memorygeist

www. DiN. org. uk

www. musicamaximamagnetica. com

www. vu-us. com

[Non-text portions of this message have been removed]

success!
 
to answer my own question:
 
connecting the SH7 'pedal vcf input' to the VAC 
output of the A101-9 Universal Vactrol module worked fine!
 
now the vcf frequency is controlled by this vactrol, 
who is in turn controlled by its own cv input on the A101-9.
so, i also have build in 'growl' response... due to 
the vactrol's own time lag...
 
but, i am still waiting, from someone on this list, 
to confirm that it is safe to connect it that way and that i will not damage the 
SH7 or the modular.
 
thanks,
Bakis.


--- On Sun, 8/7/11, Bakis Sirros <synth_freak_2000@yahoo.com> wrote:

From: Bakis Sirros <synth_freak_2000@yahoo.com>
Subject: using the SH-7 with the A101-9 Universal Vactrol module... ?
To: "Doepfer_a100 group" <doepfer_a100@yahoogroups.com>
Date: Sunday, August 7, 2011, 11:58 AM

hi all,
  
the important (and relevant to Doepfer A100) question:
 
since it looks like (to my ignorant eyes) that the SH7 
'pedal vcf input' (seems to be powered) works like a simple variable resistor (i guess that i can 
simply connect a variable resistor to this input to change the filter cutoff), 
could i use the Doepfer A101-9 Universal Vactrol module, to 
operate the SH7 filter without any modification to the synth? (using the 'vac 
out' connected to the SH7 'pedal vcf input')
 
here is the link to that module:
http://www.doepfer.de/A1019.htm

here is a link to the SH7 service manual (thanks 
CEM3374 !) :

http://www.cem3374.com/docs/Manuals/Roland/SH-7_SM.pdf




(check page 24 and the vcf circuit page, to see how 
the pedal input is...)

if this cannot be done, any help on converting the SH7 pedal vcf input to a regular cv input?


many thanks in advance for your help!
 
best regards,     :-)
Bakis.
 

Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist

[Doepfer_a100] group owner

www. parallel - worlds - music. com

www. facebook. com/ pages/Parallel-Worlds/192093934136476

www. myspace. com/ parallelworldsmusic

www. myspace. com/ interconnectedmusic

www. myspace. com/ memorygeist

www. DiN. org. uk

www. musicamaximamagnetica. com

www. vu-us. com

[Non-text portions of this message have been removed]

Hi

> but, i am still waiting, from someone on this list,
Some one answered ;-)

Yepp, should be safe.

Florian

thanks Florian!

i am so happy that Doepfer, and the A100, seem to have a solution for almost every, analogue related, problem!!   :-)



Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist

[Doepfer_a100] group owner

www. parallel - worlds - music. com

www. facebook. com/ pages/Parallel-Worlds/192093934136476

www. myspace. com/ parallelworldsmusic

www. myspace. com/ interconnectedmusic

www. myspace. com/ memorygeist

www. DiN. org. uk

www. musicamaximamagnetica. com

www. vu-us. com

--- On Mon, 8/8/11, Florian Anwander <fanwander@mnet-online.de> wrote:

From: Florian Anwander <fanwander@mnet-online.de>
Subject: Re: [Doepfer_a100] Re: using the SH-7 with the A101-9 Universal Vactrol module... ?
To: Doepfer_a100@yahoogroups.com
Date: Monday, August 8, 2011, 11:45 AM







 



  


    
      
      
      Hi



> but, i am still waiting, from someone on this list,

Some one answered ;-)



Yepp, should be safe.



Florian



    
     

    
    


 



  





[Non-text portions of this message have been removed]

> hi all,
>   
> the important (and relevant to Doepfer A100) question:
>  
> since it looks like (to my ignorant eyes) that the SH7 
> 'pedal vcf input' (seems to be powered) works like a simple
> variable resistor (i guess that i can
> simply connect a variable resistor to this input to change the
> filter cutoff),
> could i use the Doepfer A101-9 Universal Vactrol module, to
> operate the SH7 filter without any modification to the synth?
> (using the 'vac
> out' connected to the SH7 'pedal vcf input')
>  
> here is the link to that module:
> http://www.doepfer.de/A1019.htm
>
> here is a link to the SH7 service manual (thanks
> CEM3374 !) :
>
> http://www.cem3374.com/docs/Manuals/Roland/SH-7_SM.pdf
>
> (check page 24 and the vcf circuit page, to see how
> the pedal input is...)
>
> if this cannot be done, any help on converting the SH7 pedal vcf
> input to a regular cv input?
>
> many thanks in advance for your help!
>  
> best regards,     :-)
> Bakis.

Hello Bakis,

the vactrol output of the A-101-9 is completely separated from the A-100
(even no GND connection) and can be treated as a passive foot controller.
Using it as a substitute for a foot controller (variable resistor version,
not suitable for voltage divider versions with 3 terminals) should cause no
problems. But it  may work opposite depending upon the circuitry (the SH-7
schematics are very confusing, page 24 has a lot of terminals that refer to
terminals of other pages). But nothing can be damaged.

Best wishes
Dieter

thanks a lot Dieter!

Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist

[Doepfer_a100] group owner

www. parallel - worlds - music. com

www. facebook. com/ pages/Parallel-Worlds/192093934136476

www. myspace. com/ parallelworldsmusic

www. myspace. com/ interconnectedmusic

www. myspace. com/ memorygeist

www. DiN. org. uk

www. musicamaximamagnetica. com

www. vu-us. com

--- On Mon, 8/8/11, yahoo@doepfer.de <yahoo@doepfer.de> wrote:

From: yahoo@doepfer.de <yahoo@doepfer.de>
Subject: AW: [Doepfer_a100] using the SH-7 with the A101-9 Universal Vactrol module... ?
To: Doepfer_a100@yahoogroups.com
Date: Monday, August 8, 2011, 12:06 PM







 



  


    
      
      
      

> hi all,

>   

> the important (and relevant to Doepfer A100) question:

>  

> since it looks like (to my ignorant eyes) that the SH7 

> 'pedal vcf input' (seems to be powered) works like a simple

> variable resistor (i guess that i can

> simply connect a variable resistor to this input to change the

> filter cutoff),

> could i use the Doepfer A101-9 Universal Vactrol module, to

> operate the SH7 filter without any modification to the synth?

> (using the 'vac

> out' connected to the SH7 'pedal vcf input')

>  

> here is the link to that module:

> http://www.doepfer.de/A1019.htm

>

> here is a link to the SH7 service manual (thanks

> CEM3374 !) :

>

> http://www.cem3374.com/docs/Manuals/Roland/SH-7_SM.pdf

>

> (check page 24 and the vcf circuit page, to see how

> the pedal input is...)

>

> if this cannot be done, any help on converting the SH7 pedal vcf

> input to a regular cv input?

>

> many thanks in advance for your help!

>  

> best regards,     :-)

> Bakis.



Hello Bakis,



the vactrol output of the A-101-9 is completely separated from the A-100

(even no GND connection) and can be treated as a passive foot controller.

Using it as a substitute for a foot controller (variable resistor version,

not suitable for voltage divider versions with 3 terminals) should cause no

problems. But it  may work opposite depending upon the circuitry (the SH-7

schematics are very confusing, page 24 has a lot of terminals that refer to

terminals of other pages). But nothing can be damaged.



Best wishes

Dieter





    
     

    
    


 



  





[Non-text portions of this message have been removed]