Analogue systems

Um...I just went to Big City Music to see his new RS15's.

You'll notice that Bob used the polarized collared connectors for the
Doepfer rows, which take advantage of the key on the cable end so it can't
be plugged in backward.

On this particular unit, the keyways on the backplane were all facing AWAY
from the transformer.

I plugged a Doepfer module into the RS 15 without reversing the cable and
buzzed out continuity from the + and - rails and they were OK.  I took it
one step back and verified +12 volts from the RS15 power supply to pin 4 of
the Doepfer's TL074 op amp, and then verified -12 from the Analogue Systems
motherboard to the Doepfer's TL074 pin 11.

In short, this RS15 was correct and due to Bob's use of polarizing sockets,
it';s impossible to connect it on his that end backwards. Not so on the
Doepfer module end though.  I tried to intentionally insert the Doepfer
connector in backwards and the A. Sys's backplane won't let you.

Possibly the unit you had had it's connectors reversed or it was reversed on
the Doepfer end??  This RS15 was OK.  Again, the keyway's faced AWAY from
the PSU's transformer.


stuadh wrote:

> 
> Very interesting.  One thing, though.  Why mount the Doepfer
> sockets upside-down (apropos to the Doepfer system).  I
> learned this at the weekend while repositioning my Doepfer
> modules.  I went on the D website and followed the instructions
> about not twisting the cables, and...BANG!  I burnt out 5 fuses
> and I blew up my VCA.  A cheap chip change later, and all is well,
> but it was an unneccessary occurence (from a design point of
> view).  The purpose of those sockets it to power Doepfer
> modules, so it would make sense to adhere to the Doepfer
> design brief in all respects.  By the way, mine is a month old
> RS15.
> 
> just my dá sgillean.
> 
> Stuadh
> 
> --- In analogue_systems@yahoogroups.com, Peter Grenader
> <peter@b...> wrote:
>> Bob really raised the pole for everyone with the new PSU.  Its
> much better
>> mechanically and electrically, but let me just comment briefly
> on the socket
>> selection.
>> 
>> While some of this is my own conclusion, I think it's fair to say
> that
>> Analogue Systems, by virtue of coming after Doepfer, was
> conforming to the
>> Doepfer standards for power requirements, size, jack type, etc.
> This was a
>> supremely intuitive decision on Bob's part as it created a cross
> platform
>> which has unquestionably helped his sales.  A brilliant move.
>> 
>> But - for obvious reasons, he wanted to avoid using other
> companies PSUs if
>> at all possible.  It only makes sense.  You can easily guarantee
> a product's
>> performance if you can control it's operation.  Once a second
> party product
>> is introduced, you then lose a certain amount of control and
> therefore, you
>> can no longer unquestionably guarantee the operation.  I'm not
> speaking
>> about the user side of the faceplate here, that's 200%
> compatible - I'm
>> speaking about it's supply voltage source.  I am also not
> dissing the
>> Doepfer PSU.  It's a fine unit, it's just not made by Analogue
> Systems and
>> from a manufacturers standpoint, more of a risk.  The very
> same holds true
>> with Doepfer modules powered by A. Sys supplies.  It will work
> fine - but
>> it's not a controlled situation, that's all.
>> 
>> So how to you design in exclusivity?  You use another
> connector scheme and
>> that's what Bob did.  Analogue Solutions was willing to take
> that risk and
>> their modules have accommodations for both the Doepfer
> inline and the A.
>> Sys's DIP connections.
>> 
>> Bob's decision to go with DIP connectors make sense as they
> are a cost
>> effective functional alternative to the Doepfer scheme.  You just
> have to be
>> careful when connecting them, that's all.  Listen, I've got hands
> as large
>> as cricket mallets.  It takes a bit of getting used to, but you do
> and it
>> gets easy at that point. One thing I've noticed that really makes
>> connections easier is if you remove either the top or bottom
> panel from the
>> rack when making multiple connections (like when setting up
> your system
>> initially), because it allows you to view things from a shallower
> angle so
>> you're not covering up the area you need to see with your hand.
>> 
>> With Bob's new power distribution panel things are much
> better off because
>> he included Doepfer style terminations along with his DIP
> sockets on his new
>> motherboard.   He also fused the secondary side of the syste
> (not just the
>> AC mains, but the DC voltsges as well) so even if ther is a
> problem, the
>> chance of it doing little more than blowing a fuse is distant.
>> 
>> just my conjecture here...
>> 
>> - P
> 
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