[sdiy] SSM2164 panning curve

[Tom Wiltshire]

On 23 Jul 2009, at 19:42, Tim Parkhurst wrote:

> On Thu, Jul 23, 2009 at 3:31 AM, Derek Holzer<derek at umatic.nl> wrote:
>> I've got a hopefully simple question about using the SSM2164 as a  
>> joystick
>> controlled quadraphonic spatializer/panner. I have been looking at  
>> Marc
>> Bareille's Quad VCA/CV-Mixer as a good model for this project:
>>
>
> If you want to get attenuation only (and no gain) from the 2164, you
> do need to block positive CVs. Simply use an "ideal diode" which is
> basically an op amp with a couple of diodes.
>
> Tim (accentuate the negative) Servo

Yes, I agree, but I think you've got positive and negative the wrong  
way around. The SSM2164 gives gain for *negative* voltages at the CV  
input, so it's those you want to block, not positive. Just reverse  
the diodes in that ideal diode/precision rectifier. Or am I the one  
the wrong way around?

T.