Owner's manual

ManualsBrandsDoepfer ManualsAudioA-145 LFO 1

doepfer

System A - 100

LFO A-145

1. Introduction

Module A-145 (LFO) is a low frequency oscillator,

which produces cyclical control voltages in a very wide

range of frequencies.

Five waveforms are available: sawtooth, inverted

sawtooth, triangle, sine

and

square wave

The LFO can be used as a

modulation source

for

any number of modules - for instance modulating the

pulse width or frequency of a VCO, modulation of the

cut-off frequency of a VCF, or amplitude modulation

with a VCA.

A three-way switch lets you select three frequency

ranges, spanning from one cycle every several minu-

tes at the lowest, to audio frequency at the highest.

The LFO signal can also be synchronised, via the

reset input.

Reset In

Frequ.

A-145

LFO

Frequ.

Range

Summary of content (6 pages)

PAGE 1
System A - 100 doepfer LFO A-145 1. Introduction A-145 LFO Module A-145 (LFO) is a low frequency oscillator, which produces cyclical control voltages in a very wide range of frequencies. Five waveforms are available: sawtooth, inverted sawtooth, triangle, sine and square wave. The LFO can be used as a modulation source for any number of modules - for instance modulating the pulse width or frequency of a VCO, modulation of the cut-off frequency of a VCF, or amplitude modulation with a VCA. Frequ.
PAGE 2
A-145 LFO System A - 100 doepfer Controls and indicators 2. Overview A-145 LFO ➊ 1 LED: frequency indicator for the sawtooth wave at output " 2 LED: frequency indicator for the sine and square waves at output § and/or $ 3 Frequ.: frequency control 4 Frequ. Range:switch for selecting frequency range ➋ ➀ In / Outputs ➌ ➁ ➍ Frequ. ➂ ➎ 0 Reset In ➏ 2 M H L 10 Frequ.
PAGE 3
doepfer System A - 100 LFO A-145 3. Controls and indicators 4. In / Outputs 1 LED ... 2 LED ! LEDs 1 and 2 show the frequency of the voltage output at sockets " to $. This is the output for the inverted sawtooth. (Amplitude: ± 2.5 V). H If the LFO frequency goes above about 15 Hz, our persistence of vision means that the LEDs look permanently on. 3 Frequ. This control adjusts the frequency of the LFO, within the parameters of the frequency range set by switch 4. 4 Frequ.
PAGE 4
A-145 LFO System A - 100 & Reset In doepfer Trigger Moment LFO synchronisation is possible, by sending a trigger signal (eg. a gate) to the reset input. Every time a trigger voltage is sensed (for instance when a key is pressed), the LFO’s waveform resets, and starts from its zero point (see Fig. 2). Trigger Moment Without synchronisation, the LFO is free running, so that wherever the waveform is when the trigger arrives, that’s where it starts from (see Fig. 1).
PAGE 5
doepfer System A - 100 5. User examples An LFO can be used for all sorts of different modulations: • LFO - VCA (A-130, A-131, A-132) Modulation of the gain produces Tremolo • LFO - VCF (A-120, A-121, A-122, A-123) Modulation of the cut-off frequency produces cyclical variation in tone colour - Wah-wah • LFO - VCO (PWM A-110, A-111) Pulse width modulation using the LFO produces cyclical variation in tone colour (phasing type) • LFO - VCO (FM A-110, A-111) Pitch modulation using LFO produces vibrato.
PAGE 6
A-145 LFO System A - 100 doepfer 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. A-145 LFO A-145 LFO A-145 LFO 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.