Doepfer

thanks for your reply...i suspected that was the case, but i wasn't sure...it has been many years since i last used an analog phase shifter!

 also: i wasn't trying to be rude to Bakis, i just thought the issue was being a bit confused...humble apololgies for not being more tactful...

rg

----- Original Message ----
From: "hardware@doepfer.de" <hardware@doepfer.de>
To: Doepfer_a100@yahoogroups.com
Sent: Monday, February 25, 2008 1:59:26 AM
Subject: AW: [Doepfer_a100] A-125 phaser (noise issue)

> but i still would like to know if there is an adjustment to be
> made that will help with the noise...
>
> thanks,
> rg

There is no way to adjust the noise. The noise is caused by the working
principle of the A-125: six-stage all pass filter (= phase shifter) made
with FETs (field effect transistors) as variable resistors. All phasers
based on this principle have nearly the same noise floor (e.g. the M-172
from Rolands System 100M). But if you use the max. audio signal level (i.e.
before clipping occurs) and put the final VCA/VCF (if there is one in your
patch) post the phaser the remaining noise should be not an issue.

Best wishes
Dieter Doepfer




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

no prob Ross.
i'm ok.    :-)


--- Ross Goniakowski <carfull@sbcglobal.net> wrote:

> thanks for your reply...i suspected that was the
> case, but i wasn't sure...it has been many years
> since i last used an analog phase shifter!
> 
>  also: i wasn't trying to be rude to Bakis, i just
> thought the issue was being a bit confused...humble
> apololgies for not being more tactful...
> 
> rg
> 
> 
> ----- Original Message ----
> From: "hardware@doepfer.de" <hardware@doepfer.de>
> To: Doepfer_a100@yahoogroups.com
> Sent: Monday, February 25, 2008 1:59:26 AM
> Subject: AW: [Doepfer_a100] A-125 phaser (noise
> issue)
> 
> > but i still would like to know if there is an
> adjustment to be
> > made that will help with the noise...
> >
> > thanks,
> > rg
> 
> There is no way to adjust the noise. The noise is
> caused by the working
> principle of the A-125: six-stage all pass filter (=
> phase shifter) made
> with FETs (field effect transistors) as variable
> resistors. All phasers
> based on this principle have nearly the same noise
> floor (e.g. the M-172
> from Rolands System 100M). But if you use the max.
> audio signal level (i.e.
> before clipping occurs) and put the final VCA/VCF
> (if there is one in your
> patch) post the phaser the remaining noise should be
> not an issue.
> 
> Best wishes
> Dieter Doepfer
> 
> 
> 
> 
> [Non-text portions of this message have been
> removed]
> 
> 


Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist
[Doepfer_a100] group owner
http://www.parallel-worlds-music.com
http://www.myspace.com/parallelworldsmusic
http://www.myspace.com/interconnectedmusic
http://www.myspace.com/memorygeist
http://www.DiN.org.uk
http://www.musicamaximamagnetica.com
http://www.shimarecords.co.uk
http://www.rubber.gr
Athens-Greece


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