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
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email: florian.anwander@... | http://www.consol.de