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Doepfer A-143-4 Eurorack Quad VCLFO/VCO Module

£230.00 inc. UK VAT

£191.67 ex. VAT

Available on back-order

(Bear in mind prices on the UK site are shown including UK VAT. After entering your shipping address at checkout prices will update to show the correct taxes due to us based on your location. If purchasing internationally, VAT, handling fees, and import duties will potentially be due on delivery)

Product Info

Module A-143-4 is a fourfold voltage controlled low frequency oscillator (LFO). As the frequency range includes moderate audio frequencies it can be used as a four-fold VCO too.

  • Four independent VCLFOs/VCOs with triangle core
  • Frequency range switches: low (bottom position) = LFO mode, high (top position) = VCO mode
  • Two frequency control CV inputs for each unit
  • CV1 without attenuator (~ 1V/oct)
  • CV2 with attenuator
  • Manual frequency control
  • Internal jumpers for the frequency range of the manual frequency controls:
  • Jumper not installed: ~ +/- 1 octave range (mainly for VCO applications)
  • Jumper installed: ~ +/- 5 octaves range (mainly for VCLFO applications)
  • Combined Reset/Direction inputs for unit #1 – #3
  • Separate Reset and Direction inputs for unit #4 (normalled sockets, i.e. Reset is connected to Direction if the Direction socket is unused)
  • Up/both/down direction switch for unit #4, for technical details concerning the Reset and Direction function please refer to the sketch below
  • Triangle and rectangle outputs for each unit
  • Typ. output voltage range -5V … +5V for both outputs (i.e. about 10 Vpp, symmetrical with reference to 0 V)
  • Red/yellow LED displays for the triangle outputs (red = negative output voltage, yellow = positive output voltage)
  • Common control section with two CV inputs and manual control (these inputs and controls affect the frequency of all four units)
  • sum outputs for triangle and rectangle with red/yellow LED displays
  • optional ultra-low frequency mode: for this a negative voltage can be applied via a jumper internally to the CV2 input of each unit and the common section (i.e. a negative voltage is normalled to the socket CV2 in question). Then the CV2 attenuator control works as a negative frequeny control (i.e. turning up this control lowers the frequency). Herewith LFO periodes up to about one hour (or even more) are possible.
  • typ. frequency range: < 0.001 Hz (~ one hour, LFO mode with ultra-low option) ... 15 kHz (VCO mode with installed frequency range jumpers for the manual frequency controls)
  • heat-up time: ~ 15 minutes (required to heat-up the main circuit by the affixed oven)


  • Width: 22hp
  • Depth: 60mm
  • Power: +25mA / -29mA

Manufacturer product page here.
Product manual here.

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