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System A - 100

Quad Sequential Switch A-151

1. Introduction

Module A-151 (Quad Sequential Switch) is like an

electronic four-position rotary switch.

It includes trigger and reset inputs, four in / out-

puts, and a common out / input.

Each time a pulse is received at the trigger input

socket, the common out / input is connected to the

next in / output. After the fourth in / output, the next

trigger makes it step back to the first again, and so on

(see Fig. 1).

Voltages in the range -8V...+8V at the O/I resp. I/O

sockets can be processed by the module.

Four LEDs indicate the active in / output (ie. the one

that is connected to the out / input at any particular

time).

A positive pulse at the reset input switches the out /

input immediately back to the first in / output (see Fig.

1).

Version 2 of the module (from about 2005) is equip-

ped with an additional switch that is used to set the

number of steps to 2, 3 or 4. On top of that the new

versions allows to switch audio or control signals

within the full A-100 voltage range (i.e. -12V...+12V).

Trig. In

A-151

SEQ. SWITCH

Res. In

O/ I

I/O 1

I/O 2

I/O 3

I/O 4

Summary of content (6 pages)

PAGE 1
System A - 100 doepfer Quad Sequential Switch A-151 1. Introduction A-151 SEQ. SWITCH Trig. In Res. In O/I I/O 1 I/O 2 I/O 3 I/O 4 Module A-151 (Quad Sequential Switch) is like an electronic four-position rotary switch. It includes trigger and reset inputs, four in / outputs, and a common out / input. Each time a pulse is received at the trigger input socket, the common out / input is connected to the next in / output.
PAGE 2
A-151 Quad Sequential Switch System A - 100 Indicators: 2. Overview ! " 1 LED: Indicator for in / output $ 2 LED: Indicator for in / output % 3 LED: Indicator for in / output & 4 LED: Indicator for in / output / 5 Steps: Switch for the limitation of the number of addressed steps to 2, 3 or 4 (available only in version 2) § 1 2 $ % 3 & 4 / 5 2 doepfer In / Outputs: ! Trig. In : Input for trigger pulse " Res.
PAGE 3
doepfer System A - 100 3. Indicators H 1 LED • 2 LED • 3 LED • 4 LED LEDs 1 to 4 are the status indicators, showing which of sockets $ to / is connected to the common out /input § at any moment. 5 Steps This switch is used to limit the number of addressed in/outputs to 2, 3 or 4. The switch is available on in version 2 of the module (about since 2005). 4. In / Outputs ! Trig. In Socket ! is the A-151’s trigger input.
PAGE 4
A-151 Quad Sequential Switch System A - 100 H ➍ ➌ H ➋ ➊ Clock Reset H Fig. 1: How the A-151 switching works ( : in / output connected) H 4 doepfer The switches are bi-directional, so switching can take place from four inputs to one output, or four outputs to one input. Which process is happening at any one time will always be clear from looking at the modules connected. Any signal from -8 V to +8 V at the O/I resp. I/O sockets can be processed by the A-151.
PAGE 5
System A - 100 doepfer 5. User examples P Switching VCO waveforms In the example in Fig. 2, every time a trigger pulse hits the A-151’s trigger input socket, the VCO switches to a new waveform. Since very fast switching of the A-151 (by an LFO set to its fastest range, or even by a VCO) can produce audio frequency modulation - that is, changes so fast that the ear can’t resolve them - the result is in effect a new waveform. A-110 VCO LFO A-151 SEQ.
PAGE 6
A-151 Quad Sequential Switch System A - 100 doepfer Switching filter characteristics VCO VCF VCA CV LFO With the patch in Fig. 4, you can use an A-151 to step through each of the types of output in the A-121 multimode filter, one step for each note played. Gate ADSR 5 ADSR A-151 Gate ADSR 1 SEQ. SWITCH Trig. In VCA Gate Res. In O/I Gate ADSR 2 I/O 1 CV I/O 2 ADSR Trig. In I/O 3 Gate ADSR 3 Res. In I/O 4 Gate ADSR 4 A-151 SEQ.