Doepfer Dark Time,Dark Energy,

Doepfer A-111-4 Eurorack Quad Oscillator Module

Ben Chilton — Mon, 04 Nov 2024 13:23:12 +0000

A-111-4 contains four precision VCOs and has individual controls, inputs and outputs for each VCO available as well as a common control and output unit. After all the A-111-4 is very similar to four A-111-3 without LFO mode but built in output mixers for the three waveforms, and a master unit for all four VCOs. The module is based on the CEM3340 circuit.

Typical applications:

fat sounding monophonic VCO with the possibility to adjust any intervals
paraphonic patches in combination with the polyphonic CV interface A-190-5 (all four VCOs processed by one VCF/VCA)
full polyphonic patches in combination with the polyphonic CV interface A-190-5 and four complete VCF/VCA sections
complex VCO patches with up to four VCOs by means of the frequency modulation features (exponential an linear) and the sync functions

Specifications

Width: 18hp
Depth: 40mm
Power: +12V 120mA / -12V 100mA

Manufacturer product page here.

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Doepfer A-139-2 Eurorack Headphone Output Module

Ben Chilton — Mon, 04 Nov 2024 14:25:40 +0000

The Doepfer A-139-2 is a two-channel headphone amplifier, featuring two audio inputs with level controls. Input 1 is normalled to Input 2. A common loudness/master level control and headphone output (stereo 1/4″ jack socket). Max. output power is around 2W per channel (@ 8Ohm load)

DC coupled inputs and outputs (i.e. also useful for other applications like small loudspeakers, lamps, LEDs, magnets, motors – provided that the power is sufficient)

Specifications

Width: 6hp
Depth: 40mm
Power: +12V 120mA / -12V 120mA

Manufacturer product page here.

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Doepfer A-165-2 Eurorack Digital Gate/Trigger Modifier Module

Ben Chilton — Mon, 08 Jul 2024 21:06:40 +0000

The Digital Modifier A-165-2 from Doepfer can derive various switching signals from two trigger or gate signals.

The A-165-2 is a smaller and optimized version of Doepfer’s Trigger Modifier, which is no longer available. The two inputs are intended for trigger, gate or clock signals, i.e. everything for which the term digital signals can also be used. The outputs provide various states derived from the inputs.

The module is ideal for start/stop signals, signal inversion, frequency halving or converting a signal into a trigger. The module only accepts unipolar signals. Incoming bipolar signals are clipped.

The outputs work as follows:

Inverted signal to input 1

Inverted signal to input 2

T flip-flop (toggle flip-flop), controlled by input 1, this output changes its state on the rising edge of input 1

Set/reset flip-flop, this output changes its state to “high” on the rising edge of input 1 and goes to “low” on the rising edge of input 2

Inverted output of the set/reset flip-flop, this output changes its state to “low” on the rising edge of input 1 and goes to “high” on the rising edge of input 2

Pulse output, a trigger pulse of approx. 50 ms in length is generated on both the rising and falling edge of the signal applied to input 1

Specifications
Width: 2hp
Depth: 45mm
Power: +30mA, -0mA
Manufacturer product page here.

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Doepfer A-117-2 Eurorack Digital Noise Module

Ben Chilton — Mon, 08 Jul 2024 20:50:08 +0000

Your new favorite source of noise! The Doepfer A-117-2 is a small, digital and voltage-controlled noise generator. A-117-2 generates random, digital pulses that produce clicks at low frequencies and noise at high frequencies. The slow frequencies are therefore ideal for triggering random events. The high frequencies produce great hihats or modulation sources.

The module has a knob to control the frequency, which can also be voltage controlled. Furthermore, there is a clock input which, when used, switches off the internal oscillator for frequency control and replaces it with the new signal.

The two outputs are one bipolar and one unipolar version of your signal and are therefore suitable for different applications.

Very simple, but very useful!

Features:

Digital noise from 50Hz to 40kHz
CV control via frequency
XClk input for external clock signals
Outputs with unipolar and bipolar version

Specifications
Width: 4hp
Depth: 45mm
Power: +20mA, -10mA
Manufacturer product page here.
Product manual here.

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Doepfer A-134-2 Dual VC Crossfader Eurorack Module

Ben Chilton — Wed, 05 Jun 2024 15:12:19 +0000

Module A-134-2 contains two identical voltage controlled crossfader units.

Each unit has two voltage controlled amplifiers (VCAs) with opposite control behaviour available. The outputs of the two VCAs are mixed together to obtain a common output. The behaviour of the control voltage inputs can be chosen with an internal jumper:

Symmetrical mode: If the corresponding jumper is not set both VCAs of the crossfader have the same 50% amplification with zero CV. If the applied CV becomes positive the amplification of VCA1 increases and those of VCA2 decreases in the same way. A negative CV has the opposite result. The CV voltage range to obtain the maximum/minimum positions of the crossfader is about -2.5….+2.5V. This mode is useful for bidirectional (i.e. positive and negative) control voltages, for example LFO or joy stick (adjusted to 0V CV in center position).

Asymmetrical mode: If the corresponding jumper is set VCA1 is fully closed and VCA2 has full 100% amplification with zero CV. If the applied CV becomes positive the amplification of VCA1 increases and those of VCA2 decreases in the same way. The CV voltage range to obtain the maximum/minimum positions of the crossfader is about 0….+5V. A negative CV has no function in this mode. This mode is useful for unidirectional (i.e. only positive) control voltages, for example ADSR, ribbon controller or Theremin control voltage.

The CV input of the upper unit (CV1) is normalled to the CV input of the lower unit (CV2). I.e. if no plug is inserted to CV2 the CV input of the upper unit (CV1) also controls the lower unit.

The second signal input of the upper unit (In1B) is normalled to the first signal input of the lower unit (In2A). I.e. if no plug is inserted into In 2A the signal In 1B is used as the first signal input of the second unit.

Specifications
Width: 4hp
Depth: 45mm
Power: +20mA, -10mA
Manufacturer product page here.

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Doepfer A-121-3 Eurorack Multimode Filter Module

Ben Chilton — Wed, 05 Jun 2024 15:03:25 +0000

Module A-121-3 is functionally nearly identical to module A-121-2. Only the distances between the controls and sockets are smaller and rubberized, small rotary knobs are used. Therefore the front panel width is only 4HP compared to 8HP of the A-121-2. In the first place it is planned for applications where only limited space is available. The only functional difference compared to the A-121-2 is the missing attenuator for the resonance CV input CQ.

Features:

Voltage-controlled multi-mode filter with a cut-off slope of -12 dB / octave (idential to the filter of the Dark Energy II/III but has been expanded by the voltage controlled resonance feature)
Four simultaneous outputs are available, each with different characteristics: low-pass (LP), high-pass (HP), band-pass (BP) and notch (N)
manual control Freq. for the cut-off frequency of the filter (the cut-off frequency determines the point at which the respective filter effect appears)
two inputs for frequency control by means of external control voltages (frequency modulation, e.g. by ADSR or LFO):
control voltage input CV1 without attenuator, about 1V/octave sensitivity
control voltage input CV2 with attenuator FCV2 for the adjustment of the modulation depth of input CV2
frequency range about 10Hz … 20kHz
Manual control Q for the resonance of the filter
control voltage input CQ without attenuator for voltage control of the resonance
resonance up to self-oscillation, in which case the module will behave like a sine wave oscillator even without audio input signal
audio input In with attenuator Level for the adjustment of the filter input level (beyond about pos. 5 clipping/distortion occurs with typical A-100 audio levels)

Specifications
Width: 4hp
Depth: 50mm
Power: +40mA, -30mA
Manufacturer product page here.

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Doepfer A-171-2 Eurorack VC Slew Processor Module

Ben Chilton — Tue, 16 Apr 2024 13:12:47 +0000

Module A-171-2 is a voltage controlled slew limiter with a lot of additional features beyond a simple slew limiter. It’s mostly a licensed copy of Ken Stone’s VCS which is in turn based on the Serge VCS.

Specifications
Width: 8hp
Depth: 60mm
Power: +30mA, -30mA
Manufacturer product page here.

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Doepfer A-161 Eurorack Clock Sequencer Module (A-160 Expander)

Ben Chilton — Tue, 16 Apr 2024 13:05:33 +0000

Module A-161 is an eight-step Clock Sequencer which is internally connected to the Clock Divider (A-160). Eight outputs are sequentially switched by the clock signals from the A-160 (see Fig. 1) and can act, for instance, as sequential rhythmic triggers for an envelope. The reset on the A-160 also works on the A-161 (instant return to Step 1). The low/high levels of the output signals are 0V and about +10V. In combination with a mixer (A-138) short analog sequences can be generated.

The A161 draws its current via the A160 module, which MUST be fitted directly to the left of the A161. The A161 CANNOT function without the A160.

Specifications
Width: 4hp
Depth: 40mm
Power: +20mA, -0mA
Manufacturer product page here.
Product manual here.

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Doepfer A-115 Eurorack Frequency Divider Module

Ben Chilton — Tue, 16 Apr 2024 12:49:50 +0000

Module A-115 is a four-way frequency divider. The frequency of a signal at the input is halved (half frequency = first sub-octave), quartered (1/4 frequency = second sub-octave), and so on. In this way, the DIVIDER produces four sub-octaves (F/2 down to F/16).

At the output, the A-115 produces a summed mix of the original and the four sub-octaves. There are attenuators to control the amount (ie. Amplitude) of the original signal and each of the sub-octaves.

Bear in mind that the sub-octaves output by the A-115 are all true square waves. At the output there are always four square waves and the original signal available.

Specifications
Width: 8hp
Depth: 40mm
Power: +20mA, -10mA
Manufacturer product page here.
Product manual here.

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Doepfer A-110-6 Trapezoid Thru Zero Quadrature VCO Module

Ben Chilton — Tue, 16 Apr 2024 12:43:41 +0000

A-110-4 is a Trapezoid Thru Zero Quadrature VCO. The module is based on an idea by Donald Tillmann but is realized with modern electronic circuits (Don’s original design from 2003 used the obsolete CA3280). Because of it’s unique trapezoid core it’s totally different compared to other VCOs. But the trapezoid core is not the only specialty: it is also a quadrature VCO and features linear thru zero frequency modulation.

The term “quadrature” means in this connection that the oscillator outputs two trapezoid waves with 90 degrees phase shift. The same as sine and cosine of a standard quadrature oscillator. These waveforms are called TRASIN (trapezoid sine) and TRACOS (trapezoid cosine).
The term “Thru-Zero” means that even “negative” frequencies are generated. But this a bit a misleading term as negative frequencies do not really exist. “Negative” means in this connection simply that the TRASIN/TRACOS waves will stop when the linear control voltage reaches 0V and continue with the opposite directions as the linear control voltage becomes negative and vice versa.

The module has two control sections: linear and exponential. The exponential section consists of the XTune control, the 1V/Oct input and the XFM input with the corresponding attenuator XFM. The exponential control voltage is the sum of these three voltages. The linear section consists of the LFrq control and the LFM input with the corresponding attenuator LFM. The linear control voltage is the sum of these two voltages. A dual color LED is used to display the polarity of the linear control voltage. The pitch of all outputs is determined by the control voltages of both sections. When the LFrq control (LFrq means Linear Frequency Control) is fully CW the module works like a normal VCO and the LED lights blue. The pitch is then controlled by the exponential section with the manual Tune control XTune and the exponential frequency control inputs 1V/Oct and XFM. XFM is used to apply an exponential frequency modulation with adjustable depth (e.g. from an LFO or another VCO).

Other waveforms like triangle, sawtooth, rectangle and sine can be obtained very easily from the TRASIN/TRACOS signals (triangle e.g. simply by subtracting TRISIN and TRICOS). And all waveforms will be available as quadrature pairs (i.e. with 90 degrees phase shift).
That’s why we think to add all these waveform outputs to the module in the final version – or alternatively a about a breakout module which makes all 10 waveforms available (trapezoid, triangle, sine, sawtooth, rectangle – all as quadrature pairs).

Latest news (as of October 2016):
We decided to add all waveform outputs to the final version of the module rather that offering a separate breakout module. The new picture on the left shows the arrangement of the additional sockets. We also added an LED that displays the signal of the TRASIN output (in addition to the LED that displays the thru zero function). By means of 2 internal jumpers the module can be converted into a VCLFO.

Specifications
Width: 12hp
Depth: 61mm
Power: +80mA, -70mA
Manufacturer product page here.

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