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Doepfer A-138b

Doepfer A-138b

Mixer ModuleModule A-138 is a four-channel mixer that can be used for mixing control voltages as well as for mixing audio signals. A separate attenuator is available for each of the four inputs. In addition, the mixer has an attenuator at the output, so that this can also represent the end of the audio chain.

Version with logarithmic potentiometers; Particularly suitable for mixing audio signals.

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40 customer ratings:

Overall rating
4.7 out of 5 stars
handling
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5 Stars
29 Customers

29 customers have given this product a 5-star rating.

Of these, 24 customers have written no texts or given their feedback in another language.

read all 5 reviews
4 Stars
10 Customers

10 customers have given this product a 4-star rating.

Of these, 9 customers have written no texts or given their feedback in another language.

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3 Stars
1 Customer

One customer has given this product a 3-star rating.

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2 Stars
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1 Star
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Doepfer A-138-B Mixer

Blair, 18.11.2013
The A-138b is essentially a 4 into 1 mixer optimised for audio signals rather than control voltages. the 'b' in the name means the the mixer uses logarithmic rather than linear potentiometers.

For me the A-138b is an essential piece of equipment because it enables me to sum the outputs of up to 4 sound sources (for instance VCO's or noise sources) before sending the combined output to my A-108 Low pass filter module.

With one input employed, and with the channel and master levels set to 10, the volume of the output is the same level as the input signal. in other words, this module will not increase the gain of an input, it will only attenuate it.

When using multiple inputs I find I have to reduce the levels of the individual channels quite a lot, otherwise the output from the mixer becomes to much for next module in the chain. So if I am using 3 inputs, I will use a maximum of about 33% of each channel's volume.

The mixer appears to operate very quietly. It does not introduce much 'hiss' into the sound. Some reviewers have found otherwise , so it may be that my ears are not as sensitive as theirs.

I have rated the A-138b as 5 stars except for features, which I have given a 4 for. The reason for this is that the Doepfer website indicates that with no input into channel 1, the channel 1 level will act as a +5 volt DC offset. In other words, the unit *can* increase the level beyond that of an input signal. However, my unit doesn't work like this. As delivered, all 4 inputs on my A-138b work in the same way. The manual says there is a jumper I need to re-position on the rear of the circuit board to achieve the +5 volt DD offset with input level 1. I think this option should have been made available as a toggle switch on the front panel. It would be useful on occasions when I am only using 3 inputs, but I do not want to have to remove the unit from its case and re-position a jumper each time to achieve this!

Overall, another useful and great value unit from Doepfer, in my opinion.
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Total
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Does its job!

19.01.2017
Very useful 4 into 1 mixer. I've used it to mix VCO waves into the Wasp filter and the A-116 wave processor.
Will be used a LOT.
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Show variations of this product
Doepfer A-138b
(40)
Doepfer A-138b

Mixer ModuleModule A-138 is a four-channel mixer that can be used for mixing control voltages as well as for mixing audio signals. A separate attenuator is available for each of the four inputs. In...

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-110-1
(53)
Doepfer A-110-1
to the product
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Standard VCO for Modular System A-100Module A-110-1 (VCO) is a voltage controlled oscillator. The A-110-1 produces frequencies in a range of about 8 octaves, of which four waveforms are available...

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-124 Wasp Filter SE
(14)
Doepfer A-124 Wasp Filter SE

Wasp Filter Special edition, Black front, Yellow knobs

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
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Doepfer A-180-2 Multiples
(44)
Doepfer A-180-2 Multiples

Passive Multi-Port Distributor 8x Interconnected jacks, Sockets are divided into 2x quadruple groups; but can also be modified to an eight-multiple (soldering bridge on the circuit board), Width:...

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-140
(43)
Doepfer A-140

ADSR Envelope Generator The module A-140 is a envelope generator and since it delivers control voltages, belongs to the modulation-modules. As soon as the ADSR is triggered at gate-input, it...

  • Module: Yes
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Doepfer A-143-2
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Doepfer A-143-2
to the product
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Quad ADSRThe module contains 4 independent ADSR envelope generators. Each sub-module has the controls Attack, Decay, Sustain and Release. With the 3-stage range switch, the desired time range can be...

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-132-3
(19)
Doepfer A-132-3

Module Dual linear/exponential, VCA

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-199 Spring Reverb Module
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Doepfer A-199 Spring Reverb Module - electronically simulated by means of 3 spiral springs. Spring reverb systems have a very characteristic sound that is based on the (insufficient) mechanical...

  • Module: Yes
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  • Accessories: No
Doepfer A-180-3 Dual Buffered Multiple
(6)
Doepfer A-180-3 Dual Buffered Multiple

Doepfer A-180-3 Dual Buffered Multiples, dual buffered 1-in-3 multiple to copying/buffering of control and audio signals, Width: 4 TE / 4HP / 20.0 mm

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-100 LC1 Low Cost Case
Doepfer A-100 LC1 Low Cost Case
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Doepfer A-100 LC1 Low Cost Case for Eurorack Modules; build-in Power Supply A-100SSB (+12V/380 mA, -12V/380mA); 48 TE Version of the A-100LC3; build-in Bus Board with 8 Module connectors; Housing...

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Doepfer A-111-2
Doepfer A-111-2
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Doepfer A-111-2; High End VCO II / VCLFO; Width: 14 HP, Current: +70mA (+12V) / -50mA (-12V)

  • Module: Yes
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Doepfer A-119
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Doepfer A-119

External Input / Envelope FollowerModule A-119 is used to integrate external audio signals into the system A-100, and includes the components pre-amplifiers, envelope follower and a comparator. The...

  • Module: Yes
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Doepfer A-118 Noise/Random
(36)
Doepfer A-118 Noise/Random

Noise/Random Voltage Generator Module A-118 is a noise and random voltage generator. It produces the following signals: white noise, coloured noise, and random voltage. White and coloured noise can...

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-124 Wasp Filter
(35)
Doepfer A-124 Wasp Filter

Wasp Filter Module A-124 is a special 12 dB multimode filter using the "strange" filter circuit of the "EDP Wasp" (an analog synthesizer with black/yellow case built end of the seventies,...

  • Module: Yes
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Doepfer A-106-5 SEM Filter
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Doepfer A-106-5 SEM Filter

Filter 12 dB Multi-mode filter, in which the circuit of the SEM module is used, Width: 8HP 40.3 mm, Depth: 55 mm (measured from the rear of the front panel), Power requirements: +30 MA (+ 12V) /...

  • Module: Yes
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Doepfer A-131
(24)
Doepfer A-131

Doepfer A-131 VCA - voltage controlled amplifier (logarithmic).

  • Module: Yes
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Doepfer A-157 Trigger Sequencer Subsys
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Doepfer A-157 Trigger Sequencer Subsys
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Doepfer A-157 Trigger Sequencer Subsystem 1-2-3, contains: A-157-1 Trigger Matrix (8x16) + A-157-2 Output Module and A-157-3 Input Module, generate up to eight trigger signals controlled by a 8x16...

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
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Doepfer A-155
(17)
Doepfer A-155
to the product
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Analog and Trigger Sequencer for Modular System A-100 The following functions are available for the two analog rows (rotary knobs): 8 Rotary potentiometers, Scale (stepless knob) on the lower...

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-135-1
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Doepfer A-135-1
to the product
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Doepfer A-135-1 QVCA / VC Mixer, Quad Linear VCA / Voltage Controlled Mixer, Inputs: 4 x Signal in, 4 x CV In, Output: Signal Out, 4 x Single Out, Dimensions: 18 TE / 18 HP / 90.3 mm (Width) x 45 mm...

  • Module: Yes
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  • Basic System: No
  • Accessories: No
Doepfer A-145 LFO Modulation Generator
(28)
Doepfer A-145 LFO Modulation Generator

LFO Modulation Generator The module A-145 (LFO) is a low frequency oscillator, which generates periodic control signals in a wide frequency range. Five wave forms are available: saw tooth, inverted...

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
55 €
Price includes VAT, shipping costs extra
Available immediately
Available immediately

This item is in stock and can be dispatched immediately.

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item number 166482
sales unit 1 piece
available since January 2004
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in this category Rank 18
at thomann.de Rank 5850
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