Doepfer

thanks a lot Dieter!

Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist

[Doepfer_a100] group owner

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--- 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





    
     

    
    


 



  





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