Doepfer A-113 Manual

Doepfer Ikke kategoriseret A-113

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doepfer System A - 100 Subharmonic Generator A-113

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.

Mix

Out

Down

8.8.

Out 1

Level

Down

8.8.

Level

Down

8.8.

Foot

Ctr. 1

Foot

Ctr. 2

Preset

Down

8.8.

Level

Out 4

Out 2

Store

Level

Out 3

A-113 Subharmonic Generator System A - 100 doepfer

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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