Doepfer A-152 Voltage Addressed Track&Hold / Switch (Multiplexer) / Digital Outputs - Manual (Page 4)

Voltage Addressed T&H/Switch A-152
System A - 100 doepfer
4
3. Controls / Inputs / Outputs
1 Address (control)
2 CV (control) / $ CV In (socket)
This group of elements is responsible for the address
generation in the voltage controlled mode. Control 1
Adress is used to adjust the address manually. The
control voltage input $ CV In with the corresponding
attenuator 2 CV can be used to modulate the address
by means of an external control voltage (e.g. ribbon
controller A-198, Theremin A-178, joy stick A-174,
ADSR, LFO, random voltage, sequencer and so on).
The required control voltage difference at socket $ is
about 5V to reach all available addresses with attenuator
2
set to it's maximum position.
% Clock In (socket) / & Reset In (socket)
This group of elements is responsible for the address
generation in the clocked mode with the internal binary
counter. In this mode each positive transition (rising
edge) of the signal applied to the Clock input % triggers
an advance to the next step. Any positive transition of
the signal applied to the Reset input & resets the
counter to step 1.
Attention! If the module is be controlled by clock and
reset signals the analog control voltage has to remain
unchanged as the CV control has priority over the
clock/reset control. E.g. simply turn the CV control 2
fully counterclockwise (or make sure that no control
voltage is applied to socket $) and do not touch the
address control knob 1. But of course this overwriting
behaviour can be used intentionally for special effects.
3 1...8 (LEDs, 8x)
The currently addressed step of all sub-units is displayed
with one of the LEDs.
! a SW I/O (sockets, 8x)
! b Common Switches In/Out (socket)
These sockets belong to the multiplexer sub-unit. The
common socket !b is connected to the currently addres-
sed single I/O socket !a that is displayed by the illumi-
nated LED 3. The remaining seven single I/O sockets
are open, i.e. at this moment they have no connection
among each other or to the common socket !b.
The multiplexer works bidirectional. This means that it
works into both directions like a mechanical rotary
switch. The common socket may work as an output that
is connected to one of the 8 inputs (which are e.g.
connected to modulation or audio sources). But the