Doepfer A-150 Dual VC Switch - Manual (Page 4)

A-150 Dual VCS System A - 100 doepfer
4
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 proces-
sed. You find a modification of the A-150 for
signals in the range 0...+12V on our web site
www.doepfer.com in the FAQ section (click to
the FAQ button on the left side of the page).
H Another solution for signals beyond -8V resp.
+8V is to attenuate and/or to change the offset
voltage of the signal. The A-129/3 attenuator/
offset generator can be used for both purposes.
H 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 sockets. The new version can
be identified at the pc board label "A-100 SY-
STEM A-150 DUAL VC SWITCH VERSION 2
"
near the bus connector at the pc board edge.
5. User examples
Switching filter characteristics
In the example in Fig. 2, with the help of an A-150, a
signal can be switched between a 12dB and 24dB low
pass filter.
The control voltage CV
S
can for instance come from
the CV output of a MIDI-CV interface (e.g. A-191), so
that, for instance, a MIDI controller could be assigned
to switch between filter types.
Fig. 2: Switching between two filters with the A-150
VCO
CV
O/I
A-150
I/O 1
I/O 2
A-120
A-121
VCA
CV
S