DOEPFER A-147 Bedienungsanleitung

doepfer System A - 100 VCLFO A-147

1. Introduction

Module A-147 (VCLFO) is a voltage controlled low

frequency oscillator, which can produce cyclical con-

trol voltages over a 0.01Hz to 50Hz frequency range.

The VCLFO can be patched as a modulation source

for a wide range of modules (for instance, modulation

of VCO pulse-width or frequency, VCF cut-off fre-

quency, VCA amplitude modulation) and as a provider

of repetitive or clock voltages (for instance to drive the

A-161 clock sequencer).

Four waveforms are available: triangle, sine, square,

and falling sawtooth waves.

The VCLFO's frequency can be controlled by hand,

but also by voltage control.

You can sync the VCLFO to another waveform by

connecting the other waveform (eg another LFO) to

the VCLFO’s reset input.

Frequ.

A-147

VCLFO

Reset

A-147 VCLFO System A - 100 doepfer

2. Overview Controls and indicators:

1Frequ. : Manual frequency control

2CV : Attenuator for the voltage at input "

3LED : Frequency indicator for the triangle

and sine waves at outputs § and/or

4LED : Frequency indicator for the square

wave at output %

5LED : Frequency indicator for the sawtooth

wave at output &

In- / Outputs:

!Reset : Reset input for syncing the VCLFO

"CV : Control voltage input

§: Triangle wave output socket

$: Sine wave output socket

%: Square wave output socket

&: Sawtooth wave output socket

A-147

VCLFO

Frequ.

010

➊

➋

➌

➍

➎

➏

➂

➃

➄

➁

010

Reset

➀

Voltage Controlled LFO

doepfer System A - 100 VCLFO A-147

3. Controls and indicators

1 Frequ.

This control sets the frequency of the VCLFO in a

range from 0.01 Hz (one cycle every 100 seconds) to

50 Hz (50 cycles a second).

H The actual LFO frequency is determined by a

combination of manual control and any vol-

tage patched into CV input ".

2 CV

Use Attenuator 2to set the level of the voltage at CV

input "affecting the VCLFO frequency.

3 LED ... 5LED

LEDs 3to 5indicate the frequency and voltage state

of the LFO signals at their respective outputs.

H If the LFO frequency is higher than about 15

to 20 Hz, our persistence of vision means

that the LEDs look permanently on.

4. In- / Outputs

! Reset

A gate pulse entering the reset input socket !enab-

les the VCLFO to be synchronised with another

oscillator.

This means that the waveforms instantly go to their

zero-point, and start from there (see Fig. 1). In the

case of the triangle and sine waves, that’s 0 V; with

the square wave it’s about +5 V and the sawtooth it’s

at half its maximum (about +3.5 V).

" CV

Socket "is the voltage control input for LFO fre-

quency. The voltage at this input is added to whatever

voltage is set on the manual control 1. The level of CV

input "can be adjusted with the Attenuator 2.

This socket outputs a triangle wave, whose frequency

is indicated by LED 3(amplitude roughly ±5 V).

A-147 VCLFO System A - 100 doepfer

Fig. 1: How sync affects the waveforms

This socket outputs a sine wave (amplitude range

roughly ±5 V), whose frequency / voltage state is

indicated by LED 3.

This socket outputs a square wave (amplitude roughly

±5 V), whose frequency / voltage state is indicated by

LED 4.

This socket outputs a falling sawtooth wave

(amplitude roughly +7 V) whose frequency / voltage

state is indicated by LED 5.

H In contrast to the A-145 standard LFO, the

sawtooth is the identical frequency to the

other waveforms (while the A-145 sawtooth

is double the others’ frequency).

~ +5 V

~ -5 V

~ +5 V

~ -5 V

~ +5 V

~ -5 V

~ +7 V

0 V

➌

➍

➎

➏

➊

Gate

Reset

doepfer System A - 100 VCLFO A-147

5. User examples

An LFO can be used for all sorts of different modulati-

ons:

• VCLFO - VCA

Modulation of the VCA gain produces tremolo.

• VCLFO - VCF

Modulation of the cut off frequency produces cycli-

cal changes in tone colour (wah-wah).

• VCLFO - VCO (PWM)

Pulse width modulation causes cyclical changes in

tone colour.

• VCLFO - VCO (FM)

Pitch modulation produces Vibrato.

All the above refers to modulation in the sub-audio

range. With modulation at audio frequencies (the low

end of which the VCLFO can just get to), further

changes occur in the sound spectrum. Look at the

examples and suggestions in the manuals of the

respective modules.

Simulating string vibrato

The patch in Fig. 2 shows a string vibrato simula-

tion, copying the common guitar or violin playing

technique, in which the finger applying the vibrato

moves parallel to the fingerboard, in an oscillation of

varying speed, to produce a pleasing and natural

frequency modulation.

In this patch, the VCO is modulated by the VCLFO

(with the VCO’s CV input attenuator set to a low level).

While the key is held down on the keyboard, the

VCLFO's frequency increases thanks to the control

voltage from ADSR 1; at the same time, the volume

decreases, thanks to the control voltage patched from

ADSR 2 to the VCA.

Instead of ADSR 1, whose control voltage is raising

the frequency of the VCLFO, and thus the speed of the

vibrato, it’s possible to use a MIDI interface (for in-

stance an A-190 or A-191) and use aftertouch to

provide the control voltage to the VCLFO.

A-147 VCLFO System A - 100 doepfer

Fig. 2: Simulation of string vibrato

Integrating the VCLFO into a MIDI system

Unlike the A-145 and A-146 LFOs, the A-147’s fre-

quency can be voltage controlled.

This above all gives you the chance to use a MIDI-CV

interface (such as the A-190 or A-191) and use your

chosen controller to adjust the VCLFO frequency via

MIDI.

That makes the LFO frequency in effect program-

mable, and also naturally means that you can control it

while playing in real time.

VCO

A-147

Gate

VCA 2

ADSR 1

ADSR 2

Reset

doepfer System A - 100 VCLFO A-147

6. Patch-Sheet

The following diagrams of the module can help

you recall your own Patches. They’re designed so

that a complete 19” rack of modules will fit onto an

A4 sheet of paper.

Photocopy this page, and cut out the pictures of

this and your other modules. You can then stick

them onto another piece of paper, and create a

diagram of your own system.

Make multiple copies of your composite diagram,

and use them for remembering good patches and

set-ups.

P • Draw in patchleads with colored

pens.

• Draw or write control settings in the

little white circles.

A-147

VCLFO

Frequ.

Reset

Voltage Controlled LFO

010

A-147

VCLFO

Frequ.

Reset

Voltage Controlled LFO

010

A-147

VCLFO

Frequ.

Reset

Voltage Controlled LFO

010

A-147 VCLFO System A - 100 doepfer

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