DOEPFER A-130-4 QUAD VCA

DOEPFER A-130-4 QUAD VCA

DOEPFER A-130-4 QUAD VCA

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Module A-130-4 contains four linear VCAs with a common level control section for all four VCAs. It can be used for all applications of simultaneous amplitude/level control of up to four different audio or CV signals. A-130-4 is the replacement of the no longer available module A-132-2. Compared to the A-132-2 the width has been reduced from 8HP to 4HP.

The module has these controls and in/outputs available:

  • Control Man.: manual control of the amplification
  • Control CV: attenuator for the control voltage applied to socket CVo socket Input 1
  • Sockets In 1...4: VCA inputs 1...4
  • Sockets Out 1...4: VCA outputs 1...4

Application examples:

  • simultaneous amplitude/level control of up to four different audio or CV signals
  • polyphonic application 1: simultaneous control of the frequency modulation depth of 4 VCOs (Quad-LFO A-145-4 or Quad-VCLFO A-147-5 > A-130-4 > FM inputs A-111-4)
  • polyphonic application 2: simultaneous control of the pulsewidth modulation depth of 4 VCOs (Quad-LFO A-145-4 or Quad-VCLFO A-147-5 > A-130-4 > PWM inputs A-111-4)
  • simultaneous control of quadrophonic signals

Technical notes:

  • The maximum amplification for each VCA is about 1 ("Man." control fully CW). Even with an external control voltage applied to the CV input the maximum amplification is limited to 1.
  • The module is equipped with two internal connectors (pin headers with 4 pins each). Pin header #1 can be used to normalize the four inputs to other modules (e.g. Quad LFO A-145-4 or A-147-5, Quad ADSR A-143-2). Pin header #2 can be used to connect the four outputs to other modules. 
  • The max. level at the VCA inputs without clipping/distortion is about 20Vpp or +/-10V.

Breite/Width: 4 TE / 4 HP / 20.0 mm
Tiefe/Depth: 45 mm (gemessen ab der Rückseite der Frontplatte / measured from the rear side of the front panel)
Strombedarf/Current: +? mA (+12V) / -? mA (-12V)

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