Doepfer A-100MNT User Manual

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System A - 100 9. Appendix

9.3. Miniature power supply/bus

9.3.1. Introduction

The A-100 MNT (Miniature power supply / bus) is
composed of a miniature power supply and system
bus, with connectors for four modules. It’s designed
to be used with a small set-up of just a few modules, in
your own custom-designed case.

The idea is that then you can use individual A-100
modules - for instance the filters, the filterbank, fer­quency shifter, sampler, MIDI interface, etc. - as
free-standing pieces of equipment, which can easily

be integrated with your other instruments or recor­ding equipment.

The power supply provides the usual A-100 system
requirements of +12 V and -12 V, and an additional +5
V supply, for the few modules (e.g. A-190) which need
it.

The maximum current loading capacity totals 100

mA for +/- 12 V and/or 50 mA for the +5 V supply.
From spring 2007 the A-100MNT is equipped with
larger heat sinks and is able to deliver 200 mA for +/­12 V. The max. current for +5V remains unchanged.

The system bus provides connections for four System
A-100 modules. As well as the power supply, it also
carries "INT.CV" and "INT.GATE" connections (see

A-100 manual, main introduction, chapter 3, ‘The
A-100 signal flow’.).

The A-100 MNT is supplied as standard with an exter-
nal power supply, which has to be connected to the
socket on the MNT’s circuit board.

A

The external power supply’s transformer sup­plies alternating current (AC). If you want to

use another power supply instead of the one
supplied, it must have a voltage output of about

7 to 9 V AC
From spring 2007 the transformer has to be
able to deliver at least 500mA.

If you connect an external power supply
which produces direct current (DC), the A­100 MNT simply won’t work!

A

Both the A-100 MNT and any connected modu-

les must be firmly fixed into a proper casing.

Any sort of "flying construction" is absolutely dis-
couraged, because if two conductors from separate
modules accidentally make contact, (for instance if the
bus-bars from one module ended up touching another
module’s bus-bars), damage will almost certainly re­sult.

In cases like that, the
void.

and a capacity of at least 300 mA.

DOEPFER

guarantee is definitely

31

9. Appendix System A - 100

9.3.2. A-100 MNT - Overview

➀

doepfer



Controls:

1 LED : LED indicator for +12 V supply.

2 LED : LED indicator for -12 V supply.

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➁

In- / Outputs:

! BU 1 : Input for external power supply (7 ...

9 V AC)

" ST 1 ... ST 4 : Bus output sockets for four

modules.

For the new version of the pc board from spring 2007
the positions of the control LEDs are a bit different.