Doepfer A-152 Handleiding

Doepfer Niet gecategoriseerd A-152

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doepfer System A - 100 Voltage Addressed T&H/Switch A-152
1
1. Introduction
Module A152 is a useful switching and Track&Hold mo-
dule. It combines three sub-units within one module:
• 1-to-8 multiplexer
• 8-fold Track&Hold
• 8-fold digital outputs unit
The active step of the three sub-units can be controlled
by an external control voltage (CV addressed mode)
or via a Clock/Reset controlled binary counter
(clocked mode). In this case the rising edge of each
clock signal causes an advance to the next step. The
rising edge of the reset signal resets to step 1.
The currently active step is displayed by a LED.
For the CV addressed mode a manual control and a
control voltage input with attenuator is available.
The module can be used for a lot of switching and
controlling functions in the A-100 system. Among other
things the T&H section of the A-152 allows the emulation
of the "toggling T&H" function of the Buchla module
266 "Source of Uncertainty".
Voltage Addressed T&H/Switch A-152
System A - 100 doepfer
2
2. Basic principles
The sum of the voltages coming from the manual
address control and the CV input define the currently
addressed step of the 3 sub-devices. An address in the
range 1...8 is generated by an internal analog-to-digital
converter. Three address signals (A0, A1 and A2) are
used to address the sub-units multiplexer, T&H and the
digital output section with LED display.
Alternatively the address signals A0, A1 and A2 can be
generated by an internal 3 bit binary counter that is
controlled by the signals clock and reset. For this the
the analog voltage applied to the analog-to-digital con-
verter mentioned above has to remain unchanged as the
CV control has priority over the clock/reset control.
Sub-device #1 is the bidirectional 8-fold multiplexer
(nothing but an electronical 8-fold rotary switch). Bidirec-
tional 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 that are e.g. connected to modulation or audio
sources. But the common socket may even function as
input. In this case the signal applied to the common
socket is output to the currently addressed single socket.
Sub-device #2 is the addressed 8-fold T&H. The signal
at the common T&H input is connected to the addressed
T&H output. The addressed output follows the voltage
applied to the common T&H input (track phase). As
soon as another output is addressed the last voltage is
stored (hold phase).
Remark: In contrast to the Sample&Hold (see S&H
A-148) the output voltage follows (i.e. tracks) to the input
voltage as long as the corresponding stage (1...8) is
active. Just when the stage is deselected the last voltage
is held. The S&H has only a very short track phase and
picks out a sample of the input voltage within a very
short time.
Sub-device #3 is the digital output section. The digital
output of the currently addressed step turns to "high". All
other digital outputs are low.
The digital output section also drives the LEDs.
doepfer System A - 100
Voltage Addressed T&H/Switch A-152
3
Controls:
1 Address manual address control
2 $ CV attenuator for address CV input
3 1...8 LED display (8x)
Inputs / Outputs:
!a SW I/O single multiplexer inputs/outputs (8x)
!b Common Switches In/Out
common multiplexer output/input
"a T&H Outs track&hold outputs (8x)
"b Common T&H Input
common track&hold input
§ Digital Outs digital outputs (8x)
$ CV In address control voltage input
% Clock In Clock input for the binary counter
% Reset In Reset input for the binary counter
3. Overview
1
2
$
%
&
!a
"b
"a§
3
!b

Product specificaties

Merk: Doepfer
Categorie: Niet gecategoriseerd
Model: A-152

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