Doepfer

A-137-1 is a voltage controlled waveform multiplier. The basic idea of a wave multiplier is to multiply the waveform of an incoming audio signal (e.g. triangle/sinus/sawtooth of a VCO) within one period. This creates additional harmonics in the audio signal. The period duration and thus also the pitch of the signal remain unchanged - in contrast to frequency multiplication such as with the PLL module A-196.

The A-137-1 works as an "inverse low-pass filter", i.e. it adds additional harmonics to a signal poor in overtones, whereas a low-pass filter (e.g. A-120) filters out overtones from a signal rich in overtones. Therefore, the A-137 gives the best results in combination with comparatively low harmonic waveforms (e.g. triangle, sine) as input signal. For overtone-rich input signals (e.g. sawtooth) the A-137 can also be used, but the effect is not as spectacular as with a triangle signal. With square-wave signals, the effect of the A-137 is hardly noticeable.

The Multiples parameter (adjustable manually and by control voltage) defines the number of waveform multiplications within a period. The two parameters Folding Level and Symmetry (both adjustable manually and by control voltage) set the upper and lower level at which the convolution of the signal takes place. The function of these two parameters is shown graphically in the diagram below. The Harmonics parameter (adjustable manually and by control voltage) adds further harmonics (i.e. in addition to the harmonics created by waveform multiplication) by sharpening the waveform edges (amplification and limiting) and adding overshoot peaks (attenuated waves at the edges).

• Input Level to adjust different input levels for the optimal effect of the module
• Multiples: Number of curve multiplications, manual setting
• Harmonics: Adding additional harmonics by an effect similar to the resonance of filters, manual adjustment
• Folding Level: Value of the upper and lower folding level, for explanation see sketch below, manual setting
• Symmetry: Symmetry of upper and lower convolution level, see sketch below for explanation, manual adjustment
• Width: 14 TE / HP
• Depth: 65 mm
• Current consumption: +40 mA (+12 V) / -20 mA (-12 V)

Inputs/outputs:

• Audio In - also suitable for control voltages
• Multiples CV In: Control voltage input for the number of curve multiplications, with attenuator
• Harmonics CV In: Control voltage input for the Harmonics parameter, with attenuator
• Folding Level CV In: Control voltage input for the convolution level, with attenuator
• Symmetry CV In: Control voltage input for convolutional symmetry, with attenuator
• Audio Out: Output for the processed audio or control signal.

• Special edition
• Special 12 dB multimode filter
• Circuit technology of the "EDP Wasp"
• Black front
• Yellow pot caps
• Width: 8 HP
• Depth: 45 mm
• Power requirements: +30 mA (+12 V)/-10 mA (-12 V)

• Hammer action keyboard
• 88 Keys
• Graded hammer action keyboard (TP/40GH)
• Specifically for the "mobile pianist"
• USB port
• 1 x MIDI out
• Connection for double foot switch
• Dimensions (W x D x H): 135 x 27 x 11 cm
• Weight: 20 kg
• Including power adapter

• Dual Envelope Controlled VCA
• Envelope type selectable via switch: AD / AR / ADSR
• CV input with attenuator to control any envelope parameter (selectable by jumper)
• Audio input level adjustable
• Manual gate button
• Gate entrance
• CV ducking input
• VCA input / output
• Power requirement: 60 mA (+12 V) / 60 mA (-12 V)
• Width: 8 TE
• Depth: 45 mm

• Inverting/interrupting mixer
• 4-Channel mixer with level control 3-way switch per channel (inverted, mute, non-inverted)
• Channel 1 can generate an offset voltage of +/-5V
• Individual outputs for all channels for use as a 4-channel attenuator
• Two parallel mix outputs
• Power consumption: 20mA (+12V) / 20mA (-12V)
• Width: 6 U
• Depth: 40 mm

• Vintage edition with black front plate
• Allows the integration of the A-100 module system into a USB or MIDI system
• 4 Analogue CVs
• Gate signal
• Width: 6 HP
• Depth: 55 mm
• Power Requirements: + 12V: 60mA/ -12V: 10mA

• 16 Analogue control voltage outputs
• Connections for power supply
• Midi-In and Midi-Out in the form of sockets on the circuit board
• Including two 10-pin flat-ribbon cables (approx. 30 cm long)

• Frequency divider for digital clock signals
• 6 Outputs (input frequency / 2 - input frequency / 64)
• LED indicator for each output
• Eurorack format
• Width: 4 HP
• Depth: 40 mm
• Power requirements: +40 mA (+12V) / -0 mA (-12V)
• Optional expander module: Article number 186684 (not included)

At the output, the A-115 provides the sum mix of original and sub-octaves. You can adjust the amount (i.e., the amplitude) of the original signal and each sub-octave individually with an attenuator. The sub-octaves generated by the A-115 are symmetric square-wave signals. A sum mix of the four square-wave signals and the original signal is available at the output.

• Width: 8HP / 40.3 mm
• Depth: 40 mm (measured from the rear of the front plate)
• Power requirements: 20 mA (12V) / -10 mA (-12V)

• Manual control and control voltage input with attenuators for each of the parameters attack (A), decay (D), sustain (S) and release (R)
• Width: 14 TE / HP
• Depth: 70 mm
• Current requirement: +40 mA (+12 V) / -30 mA (-12 V)

• 168HP / 6U 230V
• With 2 x PSU3 power supply (+ 12V / 2000mA, -12V / 1200mA, 100 - 230V)
• Removable lid with carrying handle
• 4 Backplanes installed
• Optional modules
• Dimensions outside (L x D x H): approximately 930 x 420 x 210 mm
• Weight: Approx. 13.5 kg (without built-in modules)

• Width: 14 TE / HP
• Depth: 60 mm
• Power requirement: +80mA (+12V) / -60mA (-12V)

• Inputs: 4 x signal in, 4 x CV In
• Outputs: Signal Out, 4 x Single Out
• Width: 18 HP
• Depth: 50 mm
• Current consumption: +60mA (+12V) / -50mA (-12V)

• In the Eurorack module format
• 2 Inputs with separate level controls
• Input 1 is normalised to input 2 (switched jack input 2)
• Shared volume control
• Headphone output 6.3 mm jack
• Max. output power approx. 2 W per channel (at 8 ohm load)
• Width: 6 HP / 6 HP / 30 mm
• Depth: 40 mm

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 housing manufactured by the UK company "Electronic Dream Plant" at the end of the seventies). Hereby digital inverters would be 'misused' as analog operational amplifiers, leading to distortions and other "dirty" effects that generated the specific sound of this filter. The filter is equipped with a band pass output and a combined low / notch / high pass output. For this output a control knob controls the relation between the low and the high pass signal. If both signals appear at the same level (i.e. the middle position of the mix knob), one obtains a notch filter. Otherwise the low or high pass signal predominates.

• Special 12 dB multimode filter
• Circuit design of the "EDP Wasp"
• Width: 8 HP
• Depth: 45 mm
• Power requirement: +30 mA (+12 V) / -10 mA (-12 V)

• Perfect for polyphonic or paraphone patches
• Four precision VCOs with output mixers and a master control unit
• Waveforms: Triangle, sawtooth and rectangle with individual outputs
• Minute 10 octave frequency range
• Master section with 1V / Octave control input
• Sum output of the individual waveforms and CV output (sum of all control voltages of the master unit)
• Width: 18 TE / HP
• Depth: 40 mm
• Electricity requirement: + 120mA (+ 12V) / -100mA (-12V)

• With two modulation wheels
• The factory setting is a spring loaded wheel on the left side with bipolar voltage output (i.e. 0V in the centre position, positive voltage in the upper range, negative voltage in the lower range; voltage range approx. -5.5 V ... 0 V ... +5.5 V)
• The wheel to the right side is without spring and has a positive voltage output (i.e. 0V in the lowest position and positive voltage when operated upwards; voltage range approx. 0...+8 V)
• For the spring loaded wheel a voltage "plateau" around 0 V is the preset, so the output voltage is always 0 V in a small range near to the centre position
• Width: 14 HP
• Depth: 40 mm
• Power requirement: +10 mA (+12 V) / -10 mA (-12 V)

• Consists of Doepfer A-198 Module and Ribbon Controller
• Ribbon Controller: Generates a control voltage for the pitch of the oscillators by touching the position sensor
• Further control voltage can be generated via integrated pressure sensor
• Two sub-units: position and pressure
• Controller dimensions: approx. 600 x 30 x 30 mm (with hood on right edge)
• Eurorack format
• Width: 8 HP
• Depth: 40 mm
• Power requirement: + 40mA (+ 12V) / -20mA (-12V)

• Voltage controlled oscillator
• 3-Position toggle switch
• Linear FM input and soft-sync input
• Tune control range can be set between approx. 1/2 octave and 4 octaves via a jumper
• Width: 8 HP / 40.3 mm
• Depth: 50 mm (measured from the rear of the front panel)
• Power requirements: + 12V: 150 mA (warm up period about 30 seconds), 60 mA (continuous operation) -12V: 30mA

• Vintage edition
• 4096 BBD stages
• For the A-100 modular system
• Black front panel
• Width: 14 TE / HP
• Depth: 60 mm
• Power requirement: +80mA (+12V) / -60mA (-12V)