Doepfer A-143-3 Quad LFO User Manual
Doepfer Audio

DOEPFER
DOEPFER
DOEPFER
DOEPFER
System A-100
Quad LFO A-143-3
1
Fig. 1: A-143-3 Controls and Outputs
1. Introduction
Module A-143-3 Quad LFO is a low-cost four-fold
modulation oscillator and includes four independent low
frequency oscillators (LFO's), which produce cyclical
control voltages in a wide frequency range.
Three waveforms are available for each LFO: triangle,
square and sawtooth. The frequency of the sawtooth
output is twice the frequency of the other outputs.
The LFO's can be used as modulation sources for any
control voltage input of other modules - for instance
modulating the pulse width or frequency of a VCO,
modulating the cut-off frequency of a VCF or the phase-shift
of a VCP, amplitude modulation with a VCA, delay time of a
BBD module, parameters of a voltage controlled wave
shaper/multiplier, or any other control voltage input.
A three-way switch let’s you select three frequency ranges,
spanning from about two cycles per minute at the lowest, to
moderate audio frequency at the highest.
The module includes four identical units.
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- MTC64 Relay Board (8 pages)
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- MTC64 Power Board (8 pages)
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- Dial Electronic (12 pages)
- Wheel Electronic (16 pages)
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- A-100 (8 pages)
- A-100AD5 +5V low cost adapter (46 pages)
- A-100(~ 40 MB) (744 pages)
- A-100CGK CV/Gate keyboard (12 pages)
- A-101-1 Vactrol Steiner Filter (6 pages)
- A-101-2 Vactrol Lowpass Gate (6 pages)
- A-101-3 Vactrol Modular Phase Filter (10 pages)
- A-101-9 Universal Vactrol Module (14 pages)
- A-102 Diode Low Pass (6 pages)
- A-104 four-fold Trautonium Formant Filter (6 pages)
- A-105 24dB SSM Low Pass (8 pages)
- A-106-1 Xtreme Lowpass/Highpass Filter (12 pages)
- A-107 Multitype Morphing Filter (18 pages)
- A-108 6/12/24/48 Formant Filter (10 pages)
- A-109 Voltage Controlled Audio Signal Processor (10 pages)
- A-110 Standard VCO (12 pages)
- A-111-1 High End VCO (14 pages)
- A-111-5 Synthesizer Voice (22 pages)
- A-112 Sampler/Wavetable Oscillator (24 pages)
- A-113 Subharmonic Oscillator (14 pages)
- A-114 Dual Ringmodulator (6 pages)
- A-115 Audio Divider (6 pages)
- A-116 VC Waveform Processor (6 pages)
- A-117 Digital Noise / 808 Source (8 pages)
- A-118 Noise/Random (6 pages)
- A-119 External Input/Envelope Follower (8 pages)
- A-120 24dB Low Pass 1 (8 pages)
- A-121 12dB Multimode VCF (10 pages)
- A-123 24dB High Pass (no longer available) (8 pages)
- A-124 Wasp Filter (8 pages)
- A-125 VC Phaser (8 pages)