Doepfer

Ah right thanks Dieter that makes sense!

Regards,

Neil

Sent from my iPhone

> On 7 Jan 2015, at 10:32, yahoo@doepfer.de [Doepfer_a100] <Doepfer_a100@yahoogroups.com> wrote:
> 
> > After doing some investigating yesterday, I noticed that my A-132-3 is noticeably louder than either the A-133 or A-135-1
> > when set to exponential. Is this right? I know the response is different but had assumed that voltage levels would still
> > be similar. Is there info on all of the Doepfer VCAs and their respective amplification?
> >
> > Thanks,
> >
> > Neil
> 
> As a rule all A-100 VCAs have about amplification 1 (0dB) with +5V CV. But it's more complicated as some VCAs are equipped with
> initial gain controls and attenuators for CV and audio signals. So it's difficult to give an overview as it also depends upon the
> control settings - provided that controls are available.
> 
> And the behaviour is totally different for linear and exponential VCAs. For example the A-132-4 has a control scale of 12dB/V and is
> adjusted in the factory for amplification 1@+5V CV. With 0V CV one obtains about -60dB (-5*12), with +6V CV about +12dB which is
> already about 4 times the input level and may already cause clipping as the output range is limited to about +/-12V. With a linear
> VCA (whith an amplification 1@+5V CV) +6V CV corresponds to amplification 1.2 only ! That's why an exponential VCA seems to be much
> "louder" compared to a linear VCA as the control voltage goes beyond the 0dB (amplification 1) point. In addition there is no
> standard for the exponential scale of VCAs (like the 1V/Oct scale of VCOs) which makes things more complicated because each
> exponential VCA may behave different.
> 
> Hope this helps.
> 
> Best wishes
> Dieter Doepfer
> 
>