Analogue systems

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
> 
> 
__________________________________________________
> Do you Yahoo!?
> The New Yahoo! Search - Faster. Easier. Bingo
> http://search.yahoo.com