Doepfer A-132-4 VCA/Mixer

12

Quad Exponential VCA / Mixer

The module A-132-4 contains four identical voltage-controlled amplifiers (VCA) with exponential normalization. Each VCA has two control voltage inputs (CV1, CV2), a signal input (In), and a signal output (Out). The control voltage inputs CV1.1 and the signal inputs In1 can be bridged with the control voltage input CV2.1 via internal jumpers and with the signal input In2. This circuit is also available between amplifiers 2 and 3 as well as between amplifiers 3 and 4. If this circuit is not desired, then the jumpers must be removed.

In addition, the sum of all four outputs is available (lower left socket with the sum symbol). Therefore, amplifier 4 has only one control voltage input (CV4.1). If necessary, this socket can be bridged as control voltage input 2. Then the sum signal will no longer be available.

For each VCA output a jumper is available, which determines whether the output signal of the corresponding VCA is added to the sum signal. By default, all four jumpers are set (all four VCA output signals are added). By removing one or more of the jumpers, you can select which VCA output is added to the sum. The bridges can also be replaced by switches.

  • Four exponential VCAs
  • Designed mainly for audio signals
  • Sum of all four outputs is available
  • Width: 6 HP
  • Depth: 60 mm
  • Power requirement: +30 mA (+12 V) / -20 mA (-12 V)
Available since July 2010
Item number 251466
Sales Unit 1 piece(s)
Modul Type Mono
Width 6 TE / HP
exponential 1
$99
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12 Customer ratings

4.8 / 5

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7 Reviews

J
Compact quad VCA from Doepfer
Jonathan64 11.09.2013
This is another of Doepfer's series of quad modules containing four identical circuits. These are compact and cost-effective. This one is only 6HP wide and each of the four exponential VCAs has two voltage control inputs (except the fourth one which uses a socket for a "sum" output from all the VCAs. The audio inputs are "normalled" and cascaded together but can be isolatedfrom each other by the use of jumpers, so that each VCA is completely independent, if desired. i think this is an incredibly useful and space-saving module, and as always from Doepfer, great value for money. Get one. Get two!!
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Sundaybeat 10.11.2022
Very good module from Doepfer: four exponential VCAs and mixer packed into a small 6hp panel. It is perfect for percussive sounds. Only cons: too high CVs bring to distortion or clipping, it is better to attenuate the CV source.
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J
Kreative Bereicherung für große A100 Systeme
Joan.Jamaivue 23.12.2020
Das A-132-4 hat vier VCAs mit je 2 CV Eingängen. Damit lassen sich recht viele Anwendungen realisieren. Durch einen Summenausgang lassen sich auch Mixer aufbauen, aber es ist eine stecktechnische Fummelei, weil wie bei Doepfer üblich, nur zarte Fingerchen für die Bedienung geeignet sind. Das aber ist letztendlich ein A100 Problem. Es gibt keine Abschwächer für die Signale, das muss vorher durch andere Module gemacht werden. Das erhöht natürlich den Modulaufwand und macht die Vorteile der kleinen Frontplatte wieder zunichte. Auch der Bedarf an Patches ist hoch. Es gibt eine ganze Reihe von Steckbrücken, die im Modul verändert werden können. Das macht die Sache nicht einfacher und schnell ist auch mal vergessen, dass die interne Konfiguration verändert wurde und dann wundert man sich. Das A132-4 ist nichts für kleine Systeme - eben durch den Bedarf an weiteren Modulen und dem Patchaufwand - sollte aber in größeren Systemen nicht fehlen und ist dort sicher eine kreative Bereicherung.
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A
Chic et pas cher.
Anonymous 10.06.2016
Ce quad VCA fait très bien son boulot, à condition de s'être renseigné sur comment il le fait. Lire le manuel avant l'achat!

Ce sont des VCA exponentiels, qui se comportent mieux (euphémisme) quand on les attaque avec des enveloppes / LFO linéaires.

Il y a certaines contraintes concernant les niveaux d'entrée.
Disposer d'un atténuateur avant d'entrer dans le VCA peut être utile / nécessaire (en fonction de ce qu'on y rentre...).

La fonction de mixage des 4 VCA (sum out) est un petit plus, même si pour l'instant j'utilise les sorties individuelles par convenance. Mais couplé à un atténuateur ce module fera un très bon mixer.

Les + :
. 4 VCA pour moins de 100 euros (et comme on en a jamais assez...)
. deux entrées CV par VCA (si l'on désactive le sum out pour le dernier).
. 8 hp
. paramétrable (trimpots et jumpers prévus pour qui veut).

Les - :
. il n'y en a pas vraiment : avoir des mutes ou un potentiomètre sur chaque VCA serait génial, de même qu'un caractère LIN ou EXP... mais il ne ferait plus 6hp, et le prix ne serait plus le même.

Un bon module discret qui rend service à côté d'autres VCA plus complets.
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