Doepfer A-113 Manual

Doepfer Ikke kategoriseret A-113

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Side 1/14
doepfer System A - 100 Subharmonic Generator A-113
1
1. Introduction
Module A-113 (Subharmonic Generator) is an addi-
tional sound source that derives four independend
so-called Subharmonics from an incoming pulse si-
gnal. The module represents the sound generation
core of the Mixtur-Trautonium introduced by Oskar
Sala (ref. chapter 6).
Subharmonic means in this context a sawtooth wave
whose frequency is derived from a master frequency.
The master frequency is divided by an integer 1...24 to
obtain the subharmonic. The subharmonics are avai-
lable as 4 single outputs as well as mix output with
adjustable level for each subharmonic.
The integer divisor for each subharmonic is set with
up/down buttons. The current divisors are displayed
with four 2-digit LED displays.
The combination of 4 divisors is called mixture. 4
mixtures form a preset. 50 presets can be stored and
called up within the module.
Two gate inputs are available to switch between the
4 mixtures within one preset (controlled by any gate
signals, e.g. from foot controllers).
Attention ! The A-113 module requires an additional
+5V power supply with 100mA (e.g. the separate +5V
power supply or the +5V low-cost adapter)
A-113
Subharmonic Generator
Freq.
In
Up
Mix
Out
Down
8.8.
Out 1
Level
1
Up
Down
8.8.
Level
2
Up
Down
8.8.
3
Foot
Ctr. 1
Foot
Ctr. 2
Preset
Up
Down
8.8.
Level
4
Out 4
Out 2
Store
Level
Out 3
A-113 Subharmonic Generator System A - 100 doepfer
2
2. Basic principles
The Subharmonic Generator A-113 contains four ti-
mes the following elements (see fig. 1)
• digital frequency divider (rectangle outputs) with
2-digit display and up/down buttons for divisor adju-
stment
• rectangle/sawtooth converter (with single output)
• attenuator controlling the amount (i.e. the ampli-
tude) of the subharmonic in the mix output
The incoming signal (preferably the rectangle ouput of
a VCO) is fed into the four frequency dividers. The
frequencies of the rectangle signals generated by the
frequency dividers are determined by the current divi-
sors (1...24).
The rectangle outputs are converted to sawtooth wa-
veforms by means of the rectangle/sawtooth conver-
ters.
Fig. 1: Basic layout of the A-113

Produkt Specifikationer

Mærke: Doepfer
Kategori: Ikke kategoriseret
Model: A-113

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