DOEPFER MUSIKELEKTRONIK A-100 Betriebs- Und Einbauhinweise Seite 8

English
Important note: The new version of A-100SSB uses boxed pin headers which are
equipped with a reverse protection (gap for the "nose" of the socket of the bus cable).
When the bus cable coming from the module is connected to the boxed header in
question the "nose" has to point to the right. The polarity of the cable is correct if the
red wire of the bus cable then points to the bottom (to the continuous line labeled
"RED WIRE" on the pc board). If this is not the case please do not connect the
module to the bus board ! Otherwise both the module and the A-100SSB may be
damaged ! In that case please contact the manufacturer of the module and ask for a
suitable bus cable with the correct polarity of the connector.
The bus cables of all original A-100 modules manufactured by Doepfer are equipped
with suitable bus cables since 2012. Only for older A-100 modules manufactured
before 2012 it may happen that the polarity of the 16 pin female connector of the bus
cable is wrong (nose points to the left when red wire points to the bottom). This is
because in the past unboxed pin headers were used and the position of the "nose"
did not matter. In such a case please contact Doepfer or one of their dealers and
order a suitable bus cable.
For small DIY set-ups with up to 12 modules and a maximum of 380 mA supply
current the A-100SSB (small supply/bus board) is intended. A-100SSB is the
combination of a small power supply (+12V/max. 380mA, -12V/max. 380mA) and a
bus board with 12 connectors for A-100 modules.
A slightly modified version of the A-100SSB is used also in the case A-100LC1: the
supply and bus unit of the A-100SSB are separated and connected via cables.
That's why there is a common user's guide for both units.
The power supply provides the voltages +12V and – 12V required to run the A-100
modules. In addition +5V are available which are required for some older A-100
modules and modules from other manufacturers.
The maximum current load is 380 mA for +12V, 380 mA for -12V, and 50 mA for
+5 V. If +5V is used the current is taken from the +12V source. In this case the
currents for +12V and +5V have to be added and the sum has to be not more than
380mA.
The A-100SSB/A-100LC1 bus provides connections for up to twelve A-100 modules
or modules from other manufacturers which are 100% compatible. The busboard
also carries the internal signals CV and GATE which may be used if required. This
depends upon the installed modules and if they use the interal CV and/or Gate lines
(e.g. Midi/USB interfaces, VCOs, ADSRs).
The pc board includes a switching power supply module that converts the incoming
mains voltage (110 – 240V AC) into the low voltages (+12VDC, -12VDC) required to
run the A-100 modules.