Synth-DIY Yahoo! Groups Archives

Thread

Module requests: Simple 48 db filter and simple Hipass

2010-12-14 by Joachim

Hi,

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.

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.

What do you think?

Cheers
Joachim

Re: Module requests: Simple 48 db filter and simple Hipass

2010-12-15 by 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

Re: [Doepfer_a100] Re: Module requests: Simple 48 db filter and simple Hipass

2010-12-16 by Bakis Sirros

agree with Ingo.
i'd also be interested in a dual 48db lowpass filter module with simple features, for use with my A188 BBD modules.


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 Wed, 12/15/10, selfoscillate <synaptic_music@yahoo.com> wrote:

Show quoted textHide quoted text

From: selfoscillate <synaptic_music@yahoo.com>
Subject: [Doepfer_a100] Re: Module requests: Simple 48 db filter and simple Hipass
To: Doepfer_a100@yahoogroups.com
Date: Wednesday, December 15, 2010, 11:25 PM







 



  


    
      
      
      

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





    
     

    
    


 



  






      

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

Re: [Doepfer_a100] Re: Module requests: Simple 48 db filter and simple Hipass

2010-12-16 by Joachim

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:

Show quoted textHide quoted text

>
> 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
>
>
>
>

Re: Module requests: Simple 48 db filter and simple Hipass

2010-12-16 by selfoscillate

yes, but it should be the version described in the red font
on top of the page, a dual 30db version which can be
coupled to work as a 60db filter. i don't know if steeper
filters push the price further up. if not, that even a
dual 60db filter would make sense imo.


--- In Doepfer_a100@yahoogroups.com, Bakis Sirros <synth_freak_2000@...> wrote:

Show quoted textHide quoted text

>
> 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@...> wrote:
> 
> From: Joachim <sonicwarrior@...>
> 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
> 
> 
> 
> 
> 
> 
> 
> Â 
> 
> 
> 
>   
> 
> 
>     
>       
>       
>       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
> 
> >
> 
> >
> 
> >
> 
> >
> 
> 
> 
> 
> 
>     
>      
> 
>     
>     
> 
> 
>  
> 
> 
> 
>   
> 
> 
> 
> 
> 
> 
>       
> 
> [Non-text portions of this message have been removed]
>

Re: [Doepfer_a100] Re: Module requests: Simple 48 db filter and simple Hipass

2010-12-16 by Bakis Sirros

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:

Show quoted textHide quoted text

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

>

>

>

>





    
     

    
    


 



  






      

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