Synth-DIY Yahoo! Groups Archives

Thread

A-100PSU2

2015-10-29 by Wolfram Henke

Hi everybody,

short question: Are the 1200mA of the A-100PSU2 completely available or is there any need for some kind of headroom?

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)?

Thank you so much for any clarifying reply.

Best regards from Cologne/Germany

Wolfram

Re: [Doepfer_a100] A-100PSU2

2015-10-29 by Florian Anwander

Hello Wolfram

as both questions are related, I will answer the second question first

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)?

I think the most clear example is: A headphone amp in (loud) use will draw more current than an unused headphone amp.
Yes there is a slight difference for all modules, but it won't be really big. I can't tell you dedicated values. The biggest influence may come from blinking diodes or displays (but doesn't have to come - it always depends on the dedicated circuit).

Am 29.10.2015 um 16:36 schrieb Wolfram Henke rheinlandhippie@yahoo.de [Doepfer_a100]:

short question: Are the 1200mA of the A-100PSU2 completely available or is there any need for some kind of headroom?

It depends on, wether you expect to have some changing power requirements in your patch. If we take the headphone amp from above and you decide to have twenty seconds of very loud noise, this amp will draw more current at this moment, so you should have the corresponding headroom.

My setup allows no headroom for headroom

I think I have to make a T-shirt with this phrase ;-)

Florian

Re: [Doepfer_a100] A-100PSU2

2015-10-29 by christian ienni

My setup allows no headroom for headroom

I think I have to make a T-shirt with this phrase ;-)

i'll buy at least a couple if you do! :-D

btw Florian i want to thank you in general for all the wonderful hyper-technical info you provide in this group! i have some technical background and general knowledge, but am not a "circuit-head" and can only barely handle a soldering iron ^_^ so all the scraps of relevant info i randomly pick up are fascinating and educational (and i 've kept a few particularly informative/relevant emails). i've never calculated amperage or current draws ever... i get cases, fill them with variously interesting modules, start patching stuff together & seeing what happens, and so far at least i haven't had any problems (that's among 5 G6s, a monster base, and 2 mini-cases connected to a dark energy)... which also speaks to the extraordinary high quality and tolerance of Dieter's gear! in any case my sincere appreciation for your knowledge and expertise! :-)

-chris

Re: A-100PSU2

2015-10-29 by rheinlandhippie@yahoo.de

Hi Florian,

thank you very much for your feedback and the good example with the headphone amp.

At last one thing come true: I need one more A-100 Case.

“My setup allows no headroom for headroom”

Yeah, it’ sounds weird indeed… some kind of infinite loop

A T-Shirt with this silly phrase is a funny idea :-)

Best from Cologne

Wolfram

P.S.: And many thanks for sharing your deep knowledge about modular synths – I own your well written book and I guess I can remember some of the articles in KEYBOARDS… but that is a long, long time ago.

AW: [Doepfer_a100] A-100PSU2

2015-10-30 by yahoo@doepfer.de

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).

Show quoted textHide quoted text

> Thank you so much for any clarifying reply.
>
>
> Best regards from Cologne/Germany
> Wolfram
>

Re: AW: [Doepfer_a100] A-100PSU2

2015-10-30 by syndromeda@telenet.be

Wow, what a Great idea, specially for the Roland modules.

Well done!

------------------------------------------------------
Danny Budts
info@syndromeda.be
www.syndromeda.be
https://www.facebook.com/Syndromeda
https://syndromeda.bandcamp.com/
https://www.facebook.com/pages/Syndromeda/189901007722025?ref=hl


----- Oorspronkelijk bericht -----
Van: yahoo@doepfer.de [Doepfer_a100] <Doepfer_a100@yahoogroups.com>
Aan: Doepfer a100 <Doepfer_a100@yahoogroups.com>
Verzonden: Fri, 30 Oct 2015 10:14:19 +0100 (CET)
Onderwerp: 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
>



------------------------------------

------------------------------------


------------------------------------

Yahoo Groups Links

RE: [Doepfer_a100] A-100PSU2

2015-10-30 by Scott Rogers

So is there going to be a problem using the Roland modules in my LC9 case?

Thanks
Scott

Show quoted textHide quoted text

-----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
>

------------------------------------

------------------------------------

------------------------------------

Yahoo Groups Links

AW: [Doepfer_a100] A-100PSU2

2015-10-30 by yahoo@doepfer.de

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

Show quoted textHide quoted text

> -----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
> >
>
>
>
> ------------------------------------
>
> ------------------------------------
>
>
> ------------------------------------
>
> Yahoo Groups Links
>
>
>
>
>
>
> ------------------------------------
> Posted by: "Scott Rogers" <scott@scottfromcanada.com>
> ------------------------------------
>
>
> ------------------------------------
>
> Yahoo Groups Links
>
>
>

RE: [Doepfer_a100] A-100PSU2

2015-10-30 by syndromeda@telenet.be

Check what power they consume...amazing!!!


------------------------------------------------------
Danny Budts
info@syndromeda.be
www.syndromeda.be
https://www.facebook.com/Syndromeda
https://syndromeda.bandcamp.com/
https://www.facebook.com/pages/Syndromeda/189901007722025?ref=hl


----- Oorspronkelijk bericht -----
Van: 'Scott Rogers' scott@scottfromcanada.com [Doepfer_a100] <Doepfer_a100@yahoogroups.com>
Aan: Doepfer a100 <Doepfer_a100@yahoogroups.com>
Verzonden: Fri, 30 Oct 2015 12:04:33 +0100 (CET)
Onderwerp: RE: [Doepfer_a100] A-100PSU2

So is there going to be a problem using the Roland modules in my LC9 case?

Thanks
Scott

Show quoted textHide quoted text

-----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
>

------------------------------------

------------------------------------

------------------------------------

Yahoo Groups Links

RE: [Doepfer_a100] A-100PSU2

2015-10-30 by Scott Rogers

OOOOOps. I think I made a mistake here. I think all this might be referring to the System 1 modules. I was actually referring to the System 500 modules, which is what I thought you originally meant. I looked it up and found that the System 1 modules use 450ma. I don\u2019t see any info for the System 500 modules yet.

I was only thinking about the analog stuff so it didn\u2019t even occur to me this morning.

Scott

From: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com]
Sent: Friday, October 30, 2015 7:27 AM
To: Doepfer_a100@yahoogroups.com
Subject: AW: [Doepfer_a100] A-100PSU2

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
> >
>
>
>
> ------------------------------------
>
> ------------------------------------
>
>
> ------------------------------------
>
> Yahoo Groups Links
>
>
>
>
>
>
> ------------------------------------
> Posted by: "Scott Rogers" <scott@scottfromcanada.com>
> ------------------------------------
>
>
> ------------------------------------
>
> Yahoo Groups Links
>
>
>

Re: [Doepfer_a100] A-100PSU2

2015-10-31 by achtung_999

The system 500 modules aren't out yet I believe.

Show quoted textHide quoted text

On Fri, Oct 30, 2015 at 8:45 PM, 'Scott Rogers' scott@scottfromcanada.com [Doepfer_a100] <Doepfer_a100@yahoogroups.com> wrote:

OOOOOps. I think I made a mistake here. I think all this might be referring to the System 1 modules. I was actually referring to the System 500 modules, which is what I thought you originally meant. I looked it up and found that the System 1 modules use 450ma. I don’t see any info for the System 500 modules yet.

I was only thinking about the analog stuff so it didn’t even occur to me this morning.

Scott

From: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com]
Sent: Friday, October 30, 2015 7:27 AM

To: Doepfer_a100@yahoogroups.com
Subject: AW: [Doepfer_a100] A-100PSU2

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
> >
>
>
>
> ------------------------------------
>
> ------------------------------------
>
>
> ------------------------------------
>
> Yahoo Groups Links
>
>
>
>
>
>
> ------------------------------------
> Posted by: "Scott Rogers" <scott@scottfromcanada.com>
> ------------------------------------
>
>
> ------------------------------------
>
> Yahoo Groups Links
>
>
>