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
>