Doepfer

The A-111 uses a 3340 chip that can run on max 18V
The A-109 uses a 3379 chip that can run on max 12,5V 
Here you can find the data of the chips:
http://www.synthtech.com/cems.html


--- In Doepfer_a100@yahoogroups.com, Florian Anwander
<Florian.Anwander@...> wrote:
>
> Hi
> 
> this is described in the page 
> http://www.doepfer.de/faq/a100_faq.htm#Stromversorgung
> 
> 
> These modules will be damaged with +/-15V supplies: A-126, A-127 (old 
> version), A-129/2, A-130 (old version), A-131 (old version), A-134 and 
> A-135. These modules use the Curtis chips CEM3381 or CEM3382. The max. 
> supply voltage allowed for these integrated circuits is +/-12V. A
+/-15V 
> supply will destroy the (very expensive) CEM circuits ! The new
versions 
> of A-127, A-130 and A-131 (all manufactured from ~2001) use CA3080 or 
> LM13700 instead of the CEM circuits and will run with +/-15V without 
> problems. Even the old versions of the modules A-148, A-150 and A-151 
> will not work with +/-15V. These modules may be damaged with +/-15V 
> supplies too but the parts that may be destroyed (CD4052 or CD4053) are 
> much cheaper than the expensive CEM chips. The old version of A-148 was 
> manufactured until end of 1998, the old version of A-150 until summer 
> 2004 and the old version of A-151 until spring 2005. The old
versions of 
> these modules can be identified by the type of electronic switches: in 
> the old versions CD405x were used (CD4052 or CD4053), in the new 
> versions DG4xx are used (DG409 or DG442 in the A-148, DG409 in the
A-150 
> and A-151).
> 
> Florian
> 
> solarmaxxuk wrote:
> > Hi, Does anyone know if it's safe to use modules A111-1 and A109 with
> > +/-15v?
> > 
> > I have these modules lying around and would like to add them to my own
> > DIY modular, but as the A111-1 is so expensive I don't want to risk
> > damaging it if the voltage is too high.
> > 
> > If not, can someone point me in the right direction on how to step the
> > voltage down using a couple of +/- 12v regulators - I'm guessing it
> > shouldn't be too difficult.
> > 
> > Cheers,
> > 
> > Andy.
> > 
> > 
> > ------------------------------------
> > 
> > Yahoo! Groups Links
> > 
> > 
> > 
> > 
> 
> -- 
> Florian Anwander                  |ConSol*
> Tel.   +49(89)45841-133           |Consulting&Solutions Software GmbH
> Fax    +49(89)45841-111           |Franziskanerstr. 38, D-81669 München
> email: florian.anwander@... |http://www.consol.de
>