Doepfer

Hello everyone

i have started to notice that sound comes through my a132-3 vca even when the gain control is at zero. It is a low volume but quite annoying. Any ideas?


Cheers

ed

--- In Doepfer_a100@yahoogroups.com, "masterofthelefthand" <edwardtomlin0@...> wrote:
>
> Hello everyone
> 
> i have started to notice that sound comes through my a132-3 vca even when the gain control is at zero. It is a low volume but quite annoying. Any ideas?
> 
> 
> Cheers
> 
> ed
>


i've noticed this on my a-132-4
i'm using mine as 4 separate vca's 
a negative voltage will no doubt close it more, but why the design i wonder

> i've noticed this on my a-132-4
> i'm using mine as 4 separate vca's
> a negative voltage will no doubt close it more, but why the
> design i wonder

The A-132-4 VCAs have an exponential control scale. The A-132-4 information
on our website says "The control scale for each VCA is about 12dB/V (i.e. 1
V CV decrease corresponds to 12dB level decrease and 1 V CV increase
corresponds to 12dB level increase). 0V CV corresponds to about -60dB".
Consequently a negative voltage is required to attenuate more than -60dB.

Same applies to the A-132-3 in the exp. mode. As a rule exponential VCAs
have a certain attenuation/amplification specified in X dB/V. From the
theory one never reaches zero amplification (-OO dB) but in reality the
signal will vanish in the noise floor.

Best wishes
Dieter Doepfer

Thankyou for the response and explaination.

Regards

Ed

On 6 August 2012 10:47, <yahoo@doepfer.de> wrote:

> **
>
>
> > i've noticed this on my a-132-4
> > i'm using mine as 4 separate vca's
> > a negative voltage will no doubt close it more, but why the
> > design i wonder
>
> The A-132-4 VCAs have an exponential control scale. The A-132-4 information
> on our website says "The control scale for each VCA is about 12dB/V (i.e. 1
> V CV decrease corresponds to 12dB level decrease and 1 V CV increase
> corresponds to 12dB level increase). 0V CV corresponds to about -60dB".
> Consequently a negative voltage is required to attenuate more than -60dB.
>
> Same applies to the A-132-3 in the exp. mode. As a rule exponential VCAs
> have a certain attenuation/amplification specified in X dB/V. From the
> theory one never reaches zero amplification (-OO dB) but in reality the
> signal will vanish in the noise floor.
>
> Best wishes
> Dieter Doepfer
>
>  
>


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