Doepfer

Hello,

V2 is an older version from 2010. Due to tolerances of the V2164D sometimes
the VCA does not close with CV=0. To avoid this a high value resistor (e.g.
4M7) has to be added between pin 4 (upper VCA) or pin 5 (lower VCA) of the
V2164 and -12V. This adds a small negative voltage to the CV summing
node. -12V is available e.g. at pin 9 of the V2164 or the wire bridge "J1"
below the V2164.

In V3 and V4 of the module the 4M7 resistors have been added.

Hope this helps
Dieter Doepfer


> Hello all.
>
>
> I’ve just noticed an unusual behaviour on my A132-3 Dual VCA
>
>
> With no gain and 0 cv the bottom channel is letting bleed through.
>
>
> It seems to be on linear mode only, and it is easily audible. Top
> channel is fine.
>
>
> Looking at the pcb my module is a v2 revision with two TL074CN
> IC’s and  and one V2146D IC.
>
>
> https://www.dropbox.com/s/0kgmlmhitb21ix8/A132-3.JPEG?dl=0
>
>
> If anyone can advise it would be really helpful as I need to use
> the module to gate two channels of samples at a theatre event
> soon. The sample material suits a linear response, so I really
> need both channels to open and close at a similar rate, and to
> close to silence!
>
>
> Many thanks,
>
>
> Neal
>
>
> BTW  It’s a small LC1 rack, though I’ve tried it in my LC 3 and
> LC 6. I’m also using a recently purchased Doepfer A140-2 which I
> completely love. It pairs with the A132-3 really well and is so
> compact and useful, especially for stereo signals and twin
> voices. Would recommend it to anyone wanting to save HP.
>
>
>
>
>
>