Doepfer

the filter we need for our A-188 BBD modules is here (ok, in 30db or 60 db slopes):

http://www.doepfer.de/A100_SCF.htm

now lets see if Dieter will finalize it and bring it into production...



Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist

[Doepfer_a100] group owner

www. parallel - worlds - music. com

www. myspace. com/ parallelworldsmusic

www. myspace. com/ interconnectedmusic

www. myspace. com/ memorygeist

www. DiN. org. uk

www. musicamaximamagnetica. com

www. vu-us. com

--- On Thu, 12/16/10, Joachim <sonicwarrior@gmx.de> wrote:

From: Joachim <sonicwarrior@gmx.de>
Subject: Re: [Doepfer_a100] Re: Module requests: Simple 48 db filter and simple Hipass
To: Doepfer_a100@yahoogroups.com
Date: Thursday, December 16, 2010, 9:47 PM







 



  


    
      
      
      Hi Ingo,



a CV input sounds comprehensible to me. I just thought to omit it to

keep it simple and cheap but if it is needed it is needed.

Price is not everything. ;)



The 48 db filter is more important to me than the simple highpass.



Cheers

Joachim



Am 15.12.2010 22:25, schrieb selfoscillate:

>

> hello joachim,

>

>

>> I would like to share two module suggestion that came to my mind

>> while patching:

>>

>> 1. A simple and cheap dual 48 db filter to use with the BBD modules.

>> Only 2 jacks (in/out) and 1 potentiometer (frequency) per filter.

>

> in principle a good idea, but i'm not sure if it would be

> really satisfying for using it with a bbd, at least for me.

> without a cv input the filter cannot follow the clock of the bbd,

> which means that you need to close the filter more than necessary,

> when the delay time is modulated. the a188 has a cv output for

> controlling a vcf, so you can dial in just as much filtering as

> necessary, which is a great feature imho. this is of course not

> valid if the delay time is not modulated, but isn't that a big

> part of the fun on bbd delays? often i also add a slight portion

> of resonance on the vcf to emphasize the higher frequencies,

> which reduces the dulling effect even more. i always use

> the a108 for that, but somehow it is a bit of an overkill,

> especially when you want to filter before and after the bbd

> and therefore need two of them. so to make it cheaper without

> omiting the useful things, i would prefer a very steep

> dual vcf with reduced functions. only one cv input per channel

> instead of 3, no resonance insert, no attenuators for the

> audio input and a more neutral sounding and simpler filter

> circuit (no need for selected transistor ladder stuff here).

> it should have 48db steepness, or even 60db if possible.

> i want such a module since the a188 is available and i would

> buy it instantly. there was a switched capacitor dual filter in

> the planning stage some years ago, for exactly this purpose,

> but i believe that technical issues delayed the development

> and i don't know if this project is still alive.

>

>> 2. A simple and cheap (maybe passive) Hipass filter (80 Hz), maybe also

>> dual:

>> 2 jacks (in/out) + bypass switch.

>> Useful for modules which generate too much low end signals.

>> If it would be active and dual, one 80 Hz and one 40 Hz filter would

>> make sense in my eyes. The latter could then be used for basses and

>> bassdrums and cut those frequencies that almost no loudspeaker can

>> handle and thus increase the headroom and help reduce some nasty

>> unwanted distortion effects.

>

> a passive dual highpass filter is not a bad idea,

> i just don't know how many people would buy it,

> as it is a very simple circuit.

> maybe you should start a poll?

>

> best wishes

>

> ingo

>

>

>

>

>

> ------------------------------------

>

> Yahoo! Groups Links

>

>

>

>





    
     

    
    


 



  






      

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