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Doepfer A-133

Dual VC Polariser

The A-133 is a special dual voltage-controlled amplifier that enables both positive and negative gain. Negative gain here indicates that the input signal is inverted. The main application of the module is the processing of analog control signals, e.g. ADSR or LFO. The gain range is approximately -2.5....0....+2.5 (other gain ranges are available upon request for a small additional charge, e.g. -1...+1 or -5...+5). The gain can be adjusted manually (Man control), and by an external control input with attenuator (CV). The present gain setting is displayed with two LEDs: one for positive gain and the other for negative (so more of a gain display than a signal display, similar to the one in the A-134).

Further information

Module Yes
Empty Rack, Or Housing No
Basic System No
Accessories No
6 customer ratings:
  • 5
  • 4
  • 3
  • 2
  • 1
4.7 / 5.0
  • handling
  • features
  • sound
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Useful supplement for larger systems

Thomas327, 08.11.2012
The A-133 Polarizer is a useful tool for processing control voltages in conjunction with other modules. For example, you can easily invert an envelope with the Polarizer (some synthesizers have something like that from home) or control voltages from sequencers to get a mirrored sequence. There are no limits to the imagination.

But not only relatively low-frequency control voltages can be chased through the Polarizer. It can also be used as a ring modulator by connecting two audio signals to the two CV inputs of the polarizer.

A vermouth drop is, however, that the potentiometer for the manual adjustment of the gain is not precisely adjusted. If the potentiometer is set to 12 o'clock, the amplification is not exactly 0. Fortunately, one can still adjust by looking at 0 by turning the potentiometer until the two LEDs have reached their minimum brightness level. Therefore a somewhat restrained evaluation in the category "service".
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Effective Utility

LL., 13.01.2013
Module very useful, since it can both attenuate, invert, with modulation in CV. Display to both leds well thought out to locate the polarization. Ideal for cv processing, also works for audio but in this case attention it does not seem possible to make it completely silent, I will not recommend it as main VCA - but this is not its initial destination anyway . This difficulty in finding a completely silent point can also be a problem for cv processing, but for most applications this is not a problem. Very good manufacturing quality.
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