Great Kris, thanx for the help, so if I understand you right... using the
converter I can plug in both 12v modules and 5v modules on the same
busboard, right

----- Original Message -----
From: "Rhen, Kris" < krhen@... >
To: < Doepfer_a100@yahoogroups.com >
Sent: Thursday, April 25, 2002 2:14 PM
Subject: RE: 1 Am I very dense here


> 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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