Doepfer A-147-4 Dual VCLFO
Dual voltage-controlled LFO with four simultaneous waveforms
8 HP Eurorack module
The A-147 VCLFO is a voltage controlled low frequency oscillator capable of producing cyclical control voltages from 0.01Hz to 50Hz. It outputs four simultaneous waveforms — triangle, sine, square, and falling sawtooth — making it a versatile modulation source for tremolo, vibrato, wah-wah, and pulse-width effects. The A-147-4 Dual VCLFO combines two independent VCLFO units in a single module, each with its own CV input, reset input, and four waveform outputs.
Features
- Two independent VCLFO units in a single module
- Frequency range: 0.01Hz (one cycle per 100 seconds) to 50Hz
- Four simultaneous waveform outputs per LFO: triangle, sine, square, and falling sawtooth
- Voltage-controlled frequency via CV input on each LFO
- CV attenuator per LFO to scale the effect of the CV input on frequency
- Reset input per LFO for synchronising to another oscillator or waveform
- Triangle and sine wave amplitude roughly +/-5V
- Square wave amplitude roughly +/-5V
- Falling sawtooth amplitude roughly 0V to +7V
- On reset: triangle and sine jump to 0V, square jumps to +5V, sawtooth jumps to approximately +3.5V
- Sawtooth frequency matches other waveforms (unlike A-145 where sawtooth is double frequency)
- LED frequency indicators for triangle/sine, square, and sawtooth outputs per LFO
Controls & Jacks (27)
- Rate LED 2
- Rate LED 3
- Frequency 1
- Frequency 2
- CV Amount 1
- CV Amount 2
- CV Polarity 1
- CV Polarity 2
- PW/PM 1
- PW/PM 2
- CV 1 In
- Rate 1 In
- CV 2 In
- Rate 2 In
- Square 1 Out
- Pulse 1 Out
- Square 2 Out
- Pulse 2 Out
- Triangle 1 Out
- Saw 1 Out
- Triangle 2 Out
- Saw 2 Out
- Sine 1 Out
- Reset 1 In
- Sine 2 Out
- Reset 2 In
- Rate LED 1
How-To Guides
- Classic Tremolo on VCA
- Pitch Vibrato on VCO
- Cyclical Wah-Wah Filter Sweep
- Pulse Width Modulation Tone Colour
- Dual LFO Cross-Sync Rhythmic Complexity
- Audio Rate LFO Frequency Modulation
- LFO as Clock for Sequencer
- String Vibrato Simulation with ADSR
- MIDI-Controlled LFO Frequency
Explore the interactive A-147-4 Dual VCLFO panel on BleepDex — tap any control to learn what it does.
