Doepfer

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@consol.de |http://www.consol.de