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[Doepfer_a100] Re: Noisy A-131 VCA >> opamps

2004-02-05 by Paul Schulz

Hi folks,
my A-131 exponential VCA was bought in September 1998 (no idea when it 
was built. PCB says it´s a version 2 from 1996).
It also uses the PA382.  (the other two ICs are Texas Instruments´ TL062)

Look on the PCB (frontplate facing to the left):
-below the PA382 you can read: LIN:3381 LOG:3382
The module overview of my owner´s manual (NOT the service manual) says 
"...built with CEM3381 / 3382"
So is the PA382 the same chip as the CEM3382 but with another name? Or 
is it a totally different IC? Dieter, please help!

another look on the PCB:
-above the PA382 I can find a blank field marked "ST2" with ten solder 
points (actually that´s two pairs of five solder points marked: + / 
ground symbol / triangle symbol / CV / - )
-to the lower right of the PA382 there´s a solder point marked "JOUT / 
BOARD 2" .
Florian, you said that you can modify the A-130/131 into two VCAs when 
they use CEM chips. Is it then possible with my VCA with these solder 
points ??

bye, Paul


Julian wrote:

> >>The new 130/131 uses CA3080 OTAs (like the 132 always did).
>
>
> Dont the 130/131s use the PA382?  Mine do, but i dont know what date they
> were made.


> [...]
>
> Theres a lot of opamps out there.  The ICs on the 130/131s are certainly
> socketed (the 132 is soldered in).

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