Doepfer A-100 - Manual (Page 7)

Mechanical and electrical conception
The modular system consists of a case (e.g. 19" case A-100G6 or one of the suitcase
versions A-100P6/P9 or one of the low-cost cases A-100LC6/LC9/LCB or one of the
"monster" cases A-100PMS6/PMS9/ PMS12/PMD12/PMB) and the modules that are
installed into the case in question.
Each case contains one or more bus A-100 boards. The modules are connected to
the bus boards via ribbon cables. The bus is used to supply the modules with the
required supply voltages. For some modules the bus board can be used also to carry
the CV and the Gate signal (for details please refer to the user manuals of the
modules in question).
Important note: A-100-modules have to be connected only to original A-100 bus
boards or 100% compatible bus boards of other manufacturers ! Particularly it's not
allowed to use bus boards with polarized pin headers (bowl pin headers with code
gap). These may force the user to connect the bus cable in a direction which might be
the wrong one ! This will destroy the module and the warranty is void ! In the A-100
the colored wire of the ribbon cable marks -12V and this wire has to point to the
bottom under all conditions !
Each case contains also one or more power supplies. The power supply provides the
supply voltages +12V and –12V that are required to run the A-100 modules. A few
modules also require +5V (e.g. A-190-1 and A-113). In these cases the +5V adapter
A-100AD5 is recommended. Each power supply (A-100PSU2) provides max. 1200
mA. Until about 2001 a smaller supply with 650 mA only was used. When a system is
planned the sum of all module currents has to be less than the max. current of the
power supply.
The cases A-100G6/P6/P9/LC6/LC9/LCB have one A-100PSU2 available and can be
used for modules with a total current of 1200mA or less. With the exception of a few
very "exotic" module sets this is sufficient for all reasonable module combinations.
The cases A-100PMS6/PMS9/PMB have two A-100PSU2 available which means that
modules up to 2400 mA total current can be installed. Case A-100PMS12 contains
four A-100PSU2 corresponding to 4800 mA.