The bus board looks like this

pin 1: -12V
pin 2: GND
pin 3: GND
pin 4: GND
pin 5: +12v
pin 6: +5v
pin 7: Bus CV
pin 8: Bus Gate

Normally, the power supply ONLY supplies the first and fifth pins (as well
as the three ground pin sets) and nothing is put on pin 6, so normally there
is no 5v supply.

When you put a 5v converter on the bus, what it does is this:

pin 1: -12V
pin 2: GND
pin 3: GND
pin 4: GND +---------------------------+
pin 5: +12v >>>>---| 5v regulator converts 12v |
pin 6: +5v <<<<---| to 5v and puts back on bus|
pin 7: Bus CV +---------------------------+
pin 8: Bus Gate

(sorry for the ascii art - look at it with a proportional font and it should
be OK)

so all the guts needed to generate 5v from +12v are on the little adapter
(made up of an LM7805 3-pin chip like THIS:

http://www.hep.upenn.edu/SNO/daq/parts/lm7815.pdf

basically it takes +12v OFF of the bus (taps into it NOT removes it
entirely, the +12v is still there, but the +5v adapter uses some of its
current to 'MAKE' +5v) and then it puts the appropriately regulated +5v BACK
ONTO the bus, so in the end, you have all three voltage sources on the bus.

KRIS

> -----Original Message-----
> From: Andreas Lindholm [mailto: andreas.k.lindholm@... ]
> Sent: Thursday, April 25, 2002 1:31 AM
> To: Doepfer_a100@yahoogroups.com
> Subject: Re: 1 Am I very dense here
>
>
> Sorry, but it still unclear to me. If I put the converter two
> jacks from the
> edge of the bus board will only those be 5v outputs or will
> in fact the
> whole bus boars turn into 5v The latter is what it seems like to me.
> Needless to say that is not what I want since I only want to
> add a single
> a190 to my system. If the whole bus goes 5v then a whole row
> of modules will
> be unpowered.
>
> Indeed there could have been a whole lot more info in the
> manual for my
> taste.
>
> ----- Original Message -----
> From: "Rhen, Kris" < krhen@... >
> To: "'Andreas Lindholm '" < andreas.k.lindholm@... >;
> < Doepfer_a100@yahoogroups.com >
> Sent: Wednesday, April 24, 2002 11:57 PM
> Subject: RE: 1 Am I very dense here
>
>
> > Andreas, its ok. The 5v line is already on the bus; its
> just unused until
> > you connect the 5v adapter, which merely puts a voltage
> regulator across
> > from the +12v converting it to +5v, and sticking it on the bus. You
> should
> > be all-set!
> > KRIS
> >
> > -----Original Message-----
> > From: Andreas Lindholm
> > To: Doepfer_a100@yahoogroups.com
> > Sent: 4/24/02 3:35 PM
> > Subject: 1 Am I very dense here
> >
> > Or is there still one part missing in the manual about the
> 5v converter.
> > Fitting it it now obvious, but as to where to connect the 190 to the
> > busboard is still unclear to me. On which side of the converter Can
> > somebody plainly explain that part
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
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> >
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