Doepfer

From: "Rhen, Kris" <krhen@stucki.com>
To: <Doepfer_a100@yahoogroups.com>
Sent: Thursday, April 25, 2002 7:01 PM
Subject: RE: [Doepfer_a100] Am I very dense here?


> That is correct.  Normally, modules that don't use +5v don't even connect
> anything to those pins on their cable.  Its just totally unused.  They all
> use the +-12v stuff though, and GND of course.  Later
> KRIS
>
> > -----Original Message-----
> > 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 -----
> > > 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.
>
>
> [Non-text portions of this message have been removed]
>
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