Doepfer

If you already own an A-100LC9: yes, because each Roland module requires 480 mA !

But the good news is that (according to a note from Roland) the modules run with 5V or 12V ! Each module has a built in switching
supply that accepts both voltages. So the +5V of the new A-100PSU3 can be used e.g. for the Roland modules only and 4000mA are
sufficient for 4 modules. Then the +12V remain for A-100 modules or modules from other manufacturers that use +12V. It's a bit
unclear which cables come with the Roland modules. At the Musikmesse Roland told us that they use +5V. But the first regular Roland
modules we tried were equipped with cables that established the connection to +12V. We manufactured for Roland a couple of adapter
boards that "detour" the connection to +5V. But I don't know details about the current situation of the delivered Roland modules
(i.e. if they are equipped with cables that use +12V or +5V).

Best wishes
Dieter Doepfer


> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com]
> Gesendet: Freitag, 30. Oktober 2015 12:05
> An: Doepfer_a100@yahoogroups.com
> Betreff: RE: [Doepfer_a100] A-100PSU2
>
>
> So is there going to be a problem using the Roland modules in my LC9 case?
>
> Thanks
> Scott
>
>
> -----Original Message-----
> From: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com]
> Sent: Friday, October 30, 2015 5:14 AM
> To: Doepfer_a100@yahoogroups.com
> Subject: AW: [Doepfer_a100] A-100PSU2
>
> Hello,
>
> you find my answers written inline.
>
> And there is an additional note in this regard: from about end of November a
> new power supply will be available (A-100PSU3). It will offer 2000mA@+12V,
> 1200mA@-12V and has additional +5V with 4000mA available. It turned out that
> there are many modules from other manufacturers available that take more
> current  than A-100 modules (e.g. the new Roland modules). Some of them also
> require a high current at +5V. Internally the A-100PSU3 is a +/-15V
> switching supply (wide range input 100...240V for mains voltage) followed by
> the classical linear regulation circuit of the A-100PSU2 that generates
> required +12V and -12V. Only the +5V is a pure switching supply without
> linear regulation. We discovered that a pure 12V switching supply was not
> good enough for the modular system (especially the load regulation was not
> satisfying for all 12V switching supplies we tried). That's why we added the
> well-tried linear regulation to the 15V switching supply.
>
> Best wishes
> Dieter Doepfer
>
> > -----Ursprüngliche Nachricht-----
> > Von: Doepfer_a100@yahoogroups.com
> > [mailto:Doepfer_a100@yahoogroups.com]
> > Gesendet: Donnerstag, 29. Oktober 2015 16:36
> > An: Doepfer_a100@yahoogroups.com
> > Betreff: [Doepfer_a100] A-100PSU2
> >
> >
> > Hi everybody,
> >
> > short question: Are the 1200mA of the A-100PSU2 completely available or is
> there any need for some kind of headroom?
>
> Each A-100PSU2 is tested with a dummy load of 10 Ohm which corresponds to
> 1200 mA. We also tested all kind of A-100 cases with built in A-100PSU2
> under these conditions to find out if there may be thermal problems. All
> results were OK. Consequently I can confirm that there is no need for a
> headroom. As long as the sum of all currents of the A-100 modules driven by
> the A-100PSU2 is less than
> 1200 mA everything is OK. The current for each A-100 module is specified on
> the info page of each module. But one has to take the worst case, e.g. the
> max. value (120 mA) for the headphone amplifer.
> But I can speak only for A-100 modules and the statements are valid for
> "normal" conditions. There is always some chance that a module takes more
> current than specified because of a fault (e.g. defective integrated circuit
> or electrolytic capacitor). But this is normally recognizable in the
> malfunction of a module
>
> > To be honest: My actual setup allows no headroom for headroom :-(
> >
> >
> > Another quickie: Is there any difference between the voltage
> > consumption of connected modules (buffered indeed)  in use and unpatched
> modules (but connected to the bus)?
>
> There is no difference if a module is patched or not. There is only one
> module that comes to my mind where the current depends upon the usage: the
> headphone amplifier (as already mentioned by Florian).
>
> > Thank you so much for any clarifying reply.
> >
> >
> > Best regards from Cologne/Germany
> > Wolfram
> >
>
>
>
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> ------------------------------------
> Posted by: "Scott Rogers" <scott@scottfromcanada.com>
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