The A Sysy power supply uses regulators which are rated as
follows:
5 volt line:
7805 rated at 1 amp
+12 volt line:
LM317 rated at 1.5 amps
-12 volt line:
LM337 rated at 1. 5 amps
Your mileage may vary - but it looks to be good for more than half
an amp. This is not to say that I was surprised how much juice
the 290 requires - I was thinking it was up in the 300 ma range,
half an amp is really high and yeah, this could creat a problem
in 3 or 6u chassis causing over load to even an A Sys supply.
The bottom line, modules with displays are going to pull a lot of
juice. Being LCD it's not nearly as bad as if they were (gasp)
LED displays, but still they are current hogs. I would suggest
any of you who have more than one module with LCDs spread
them out, one each to a chassis box (and power supply).
Something I did that you may wish to consider: I own a slew of A
Sys, Doepfer and some A Sol gear, but use my one case and
because of that, my own supply - in this instance a Condor. They
are not cheap, but offer really good overdrive protection and are
tremendously clean.
For instance - if I accidently connect a module's power
backwards - the supply folds back in about 20 ms. No blown
fuse, no burnt rectifier - it just turns itself off.
But there is a price to pay for this convenience - the dual +/-
supply alone, without a fuse, without ac connected and needing
all that wiring runs about $120. I have one for the 15 volt
modules (Blacet, MOTM, Oakley, and my homebrew stuff), and a
12 volt for the 3U high stuff. For the 5 volt, I use one of Doepfer's
little piggyback plug-in regulator modules.
Hope this helps,
Peter
--- In analogue_systems@yahoogroups.com, Bakis Sirros
<synth_freak_2000@y...> wrote:
> hi list,
> yes,but ,doesn't analogue systems own case(rs15) has a
> PSU that can handle only 500mA???so,if someone want to
> add an rs290 into this rs15,what can he do??add a
> second PSU?can this be done by AS??
> bakis.
>
>
> --- Arnauld Michelizza <am@z...> wrote:
> >
> > I have forwarded your bug reports about rs290 module
> > to Bob William. Here
> > is his answer :
> >
> > We have learnt that the faults are to do with
> > power
> > supply issues due to our modules being fitted into
> > inferior
> > cases from other manufacturers. It seems the +12v
> > and +5v rails
> > are being affected.The rs290 alone gives out 360ma
> > and the rs95
> > vco's on one system being 90ma each makes 540ma
> > before any other
> > module is added and if the power supply only
> > handles say 500ma
> > then there is going to be tears. An rs15 has been
> > ordered by
> > one of the users so hopefully there will be no more
> > problems.
> > Our designer Les Newell may email the user group
> > with detailed
> > explanation but if you can mention that it is not a
> > module
> > fault(of course there may be bugs in it that will
> > come to light
> > in the future)then at least users or potential
> > users will be
> > reassured.
> >
> >
> > Arnauld
> >
> >
>
>
> =====
> synthfreak(parallel worlds)
> athens-greece
> [Doepfer_a100] group owner
>
>
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