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System A - 100

Dual VCS A-150

1. Introduction

Module A-150 (Dual VCS) contains two separate

voltage-controlled switches

Each switch has a control voltage input, a common

Out / Input

, and two

In / Outputs

The switches are

bi-directional: they can work in both directions, so

can connect one input to either of two outputs, or

either of two inputs to one output. Voltages in the

range -8V...+8V at the O/I resp. I/O sockets can be

processed by the module.

Two LEDs show which in / output is active (ie. which

is connected to the common out / input).

From about March 2004 a new version of the A-150 is

available. This allows the full A-100 voltage range

-12V...+12V for the voltages at the O/I resp. I/O soc-

kets. The new version can be identified at the pc

board label "A-100 SYSTEM A-150 DUAL VC

SWITCH VERSION 2

" near the bus connector at the

pc board edge.

O/ I

A-150

I/ O 1

O/ I

I/ O 2

I/ O 1

I/ O 2

DUAL VCS

Summary of content (6 pages)

PAGE 1
System A - 100 doepfer Dual VCS A-150 1. Introduction A-150 DUAL VCS CV I/O 1 I/O 2 O/I CV I/O 1 I/O 2 O/I Module A-150 (Dual VCS) contains two separate voltage-controlled switches. Each switch has a control voltage input, a common Out / Input, and two In / Outputs. The switches are bi-directional: they can work in both directions, so can connect one input to either of two outputs, or either of two inputs to one output. Voltages in the range -8V...+8V at the O/I resp.
PAGE 2
A-150 Dual VCS System A - 100 doepfer Indicators: 2.
PAGE 3
System A - 100 doepfer 3. Indicators Dual VCS A-150 CV 1 LED ... 2 LED LEDs 1 and 2 serve as status indicators, to show which of the two in / outputs " and § is at that moment connected to the common out / input $. ~ 3.6 V 4. In / Outputs I/O 1 I/O 2 O/I ! CV Socket ! is the input for the digital control voltage, whose level determines the switch state (see Fig. 1): • CV low ( < ~3.6 V): O/I ---- I/O 1 • CV high ( > ~3.
PAGE 4
A-150 Dual VCS System A - 100 H The switches are bi-directional: that is, two inputs can be connected to one output, and vice versa. The particular arrangement of inputs / outputs will always be clear from looking at what is patched to which socket. H Any signal from -8 V to +8 V can be controlled by the A-150. Voltages less than -8V or more than +8V will lead to malfunction of the module ! It is possible to modify the module so that voltages in the range 0...+12V can be processed.
PAGE 5
System A - 100 doepfer Dual VCS A-150 Switching between modulation sources Switching by audio-range signals In the example in Fig. 3, the A-150 switches between two filter cut-off modulation sources. The control voltage CVS (for instance from a MIDI controller) determines whether the ADSR (when CVS = 0 V) or the output from the mod wheel CVM (when CVS = +5 V) controls the cut-off frequency of the filter. In Fig. 4, the A-150 is set up to switch the audio output of a VCO.
PAGE 6
A-150 Dual VCS 6 System A - 100 doepfer