Modules


 

Each module has its own power regulation to +12/-6 Volt, except for the SW901AB oscillator bank.
The power regulation for the SW901AB is done on the 901A which supplies the 901B`s.

 

 

 

1

SW901 OSCILLATOR

SW901 OSCILLATOR
Status 
available
TECHNICAL SPECIFICATION 

Characteristic:

1V/Octave

Impedance:

100k ohm

Number of control inputs:

3

Waveforms:

Sinewave / Sawtooth / Pulse / Triangular available simultaneously

Impedance of fixed outputs:

600 ohm

Level of outputs:

0,5 V RMS

Impedance of vari. outputs:

1500 ohm

Level of vari. outputs:

0 - 0,5 V RMS

Power Requirements:3

+/-15 Volt at + 65 mA / - 55 mA

Depth:

180 mm (incl. connector board)

2

SW901AB OSCILLATOR BANK

SW901AB OSCILLATOR BANK
Status 
available
TECHNICAL SPECIFICATION 

SW901A

Number of control inputs:

3

Impedance:

100k ohm

Characteristic:

1V/Octave

SW901B

Number of outputs:

4 Sinewave / Sawtooth / Pulse / Triangular

Impedance of outputs:

600 ohm

Level of outputs:

0,5 V RMS

Power Requirements

“.com” connector on SW 901A +/-15 Volt at + 120 mA /- 90 mA All connected SW 901B ́s are supplied from SW 901A

Depth:

180 mm (incl. connector board)

3

SWCP3 MIXER & SWCP3H MIXER

MUSICAL APPLICATION 

The four channel mixer is useful for combining several signals to form a single output. Audio signals from up to four different sources can be varied in relative volume before processing the mix through filters or amplifiers for a final result. Control voltages can be mixed, attenuated and phase inverted before being introduced into a voltage controlled module. In addition, the CP3 mixer can be used for phase cancellation of complex sounds, e.g. if two or more signals with similar frequency content are combined at opposite phase relationships and for feedback where the output of the mixer is sent directly back to an input of the CP3 mixer.

SWCP3 module + 3-Unit-CP3-02
Status 
available
TECHNICAL SPECIFICATION 

Input Impedance:

25k ohm

Output Impedance:

600 ohm

Gain:

x2 maximum

S/N Ratios:

> 60 dB

Outputs:

positive and negative outputs

Power Requirements:

+/-15 Volt at +/- 30 mA

Depth-SWCP3-MIXER:

Approx. 80 mm

Depth-SWCP3H MIXER:

Approx. 58 mm

4

SW984 FOUR CHANNEL MATRIX MIXER

MUSICAL APPLICATION 

The SW984 Mixer serves as a final audio summing device for up to four different inputs. Outputs can feed any line level monitor or recording system. Optimum impedance match is 10k ohm or less. The multiple inputs and outputs of this module serve as good mixing point for external sound processors which will modify or add echo to the synthesizer signal before entering the recording or monitoring system.

SW984 FOUR CHANNEL MATRIX MIXER
Status 
available
TECHNICAL SPECIFICATION 

Input Impedance:

25k ohm

Output Impedance:

5k ohm

Gain:

approx. x 1,25

S/N Ratios:

> 65 dB

Inputs:

Four input potentiometer per channel, AC coupled

Outputs:

4, AC coupled

Power Requirements:

“.com” connector +/-15 Volt at +/- 75 mA

Depth:

160 mm

5

SW904A VOLTAGE CONTROLLED LOW PASS FILTER

MUSICAL APPLICATION 

The Voltage Controlled Low Pass Filter is one of the building blocks of analog synthesis. The characteristic upper spectral sweep found in wind instruments articulation is simulated utilizing this filter and the DC voltage supplied by an Envelope Generator with each trigger from a controller. Virtually, every instrumental simulation can use this filter arrangement as part of its overall patch. The lowpass filter is a key module in creating widely varying timbres via subtractive synthesis.

SW904A VOLTAGE CONTROLLED LOW PASS FILTER
Status 
available
TECHNICAL SPECIFICATION 

Cutoff Frequency fc range:

Signal Input Impedance:

9.2 k ohm

Signal Input Level:

0 dBm nominal, +10dBm max without clipping

Attenuation slope above Fc:

24 dB per octave

Control Input Frequency Response:

DC to 50 kHz

Control Input Impedance:

100k ohm

Number of control inputs:

3

Output Impedance:

680 ohms (AC coupled)

Power Requirements:

+/-15 Volt at + 75 mA / - 40 mA

Depth:

160 mm

PDF Download 

6

SW904B VOLTAGE CONTROLLED HIGH PASS FILTER

MUSICAL APPLICATION 

The Voltage Controlled High Pass Filter is most useful for altering the timbre of input signals by deleting the predominance of the fundament partial in a complex tone. Voltage control of this module often creates a spectral sweep radically different from those associated with acoustic instruments. A thin or “tinny” sound often results when using this filter. Low frequency control voltages (10 – 20 Hz) can, if their gain is boosted from the nominal fixed level output of the 901 Oscillator, effect in a rattling or “scraping” sound (almost regardless of input signal). Connected to the Low Pass Filter in parallel, series, the High Pass Filter helps form band pass and band reject filters.

SW904B VOLTAGE CONTROLLED HIGH PASS FILTER
Status 
available
TECHNICAL SPECIFICATION 

Cutoff Frequency fc range:

1Hz to 50 kHz

Signal Input Impedance:

33k ohm

Signal Input Level:

0 dBm nominal, +10dBm max without clipping

Signal gain:

0 dB nominal

Cutoff slope:

24 dB per octave

Control Input Frequency Response:

DC to 16 kHz

Control Input Impedance:

100k ohm

Number of control inputs:

3

Output Impedance:

680 ohm (AC coupled)

Power Requirements:

+/-15 Volt at + 75 mA / - 50 mA

Depth:

160 mm

7

SW907A FIXED FILTER BANK

MUSICAL APPLICATION 

The Fixed Filter Bank is often referred to as formant filter because it can be set to emphasize or attenuate midrange frequencies, which fall within a particular band, no matter how the frequencies of the signal are moved. Like many acoustic instruments, a characteristic set of formants, are always a part of the resultant output (given a particular complex waveform). Emphasized bands of this sort are particularly evident with double reed instruments. Thus, this filter is part of the patch for these simulations.

In addition, completely different timbres can be set up for different ranges of the same tone, if the output of the filter is recombined with unfiltered frequencies at different levels.
SW907A FIXED FILTER BANK
Status 
work in progress
TECHNICAL SPECIFICATION 

Signal Input impedance:

10k ohm

Signal Output impedance:

680 ohm

Signal Gain:

unity

Output Noise:

Power Requirements:

+/-15 Volt at + 20 mA / - 10 mA

Depth:

160 mm

8

SW914 FIXED FILTER BANK

MUSICAL APPLICATION 

This Extended Range Filter Bank is highly useful for emphasizing or attenuating frequency bands in the mid-range of hearing. Instrument simulation, especially double reeds, is a major application for this module due to their varied resonances in mid-range frequency bands. Varying frequency response in each of the half/ octave ranges, even slightly, will change the timbre of a tone as it is moved from one region to the next. Radically different timbres can be overlapped from one frequency range to another, by utilizing the 914 as a fixed cut-off filter. In one range, a particular timbre may predominate when mixed with another. When the signal is moved into a cut-off range, the non-filtered frequencies of the mix will assume maximum importance.

SW914 FIXED FILTER BANK

SW914 FIXED FILTER BANK

SW914 FIXED FILTER BANK
Status 
available
TECHNICAL SPECIFICATION 

Signal Input impedance:

50k ohm

Signal Output impedance:

1k ohm

Signal Gain:

unity

Output Noise:

Power Requirements:

+/-15 Volt at + 20 mA / - 10 mA

Depth:

160 mm

9

SW902 VOLTAGE-CONTROLLED AMPLIFIER

MUSICAL APPLICATION 

The SW902 Voltage-Controlled Amplifier is used in any circumstances where variable gain is desired for gating or modulating AC or DC voltage sources. Articulation of a tone or sound, utilizing oscillators, controllers, envelope generators and the VCA is the basic traditional patch around which most performance oriented synthesizers are based. In addition to DC control voltage, the VCA can be controlled by varying voltages (AC) from sources like the SW 901 Oscillator. Slowly varying control voltages (2-9 Hz) can create tremolo or echo like effects upon an audio signal. Audio control frequencies create sidebands with often clangorous effects, usefull for a variety of audio timbres and percussive sounds. The inverting outputs of the VCA can be useful for spatial modulation, signal inverting of control voltages, controlling two oscillators in contrary motion with a single control signal and various amplitude sampling arrangements.

SW902 VOLTAGE-CONTROLLED AMPLIFIER
Status 
available
TECHNICAL SPECIFICATION 

Signal Input Frequency Response:

DC to 50 kHz

Signal Input Impedance:

10k ohm nominal

Control Input Frequency Response:

DC to 50 kHz

Control Input Impedance:

100k ohm nominal

Number of control inputs:

3

Output Impedance:

680 ohm

Power Requirements:

+/-15 Volt at + 75 mA / - 40 mA

Depth:

160 mm

10

SW911 ENVELOPE GENERATOR

MUSICAL APPLICATION 

The SW911 Envelope Generator completes one of the most important musical functions: That of producing a variable one-shot control voltage contour in time. This output is thus capable of controlling any voltage controlled module – most notably a Voltage Controlled Amplifier – resulting in the articulation of a single sound. Keyboard controllers initiate a trigger on every key, which is depressed in sequence specifically to fire the envelope generator. Ribbon Controllers, Sequencial Controller Complements and Envelope Followers, all output V-trigger which initiate the action of this module as well. Characteristic spectral sweeps associated with the articulation of a note by an acoustic instrument are simulated by utilizing the Envelope Generator to control the frequency cutoff of the SW 904A Low Pass Filter, SW 904B High Pass Filter or other associated modules. With considerable attenuation, the Envelope Generator can create tunable glissandi when controlling a single oscillator. Envelope Generators are used in association with the SW 911A Dual Trigger Delay to create multiple or combined DC voltage contour outputs.

SW911 ENVELOPE GENERATOR
Status 
available
TECHNICAL SPECIFICATION 

Trigger Input:

V-Trigger (internally converted to S-Trigger)

Time Range on T1, T2, T3:

2 msec to 10 sec

Peak DC output on Esus:

5,5 Volt

Power Requirements:

+/-15 Volt at + 25 mA / - 20 mA

Depth:

160 mm

11

SW911A DUAL TRIGGER DELAY

MUSICAL APPLICATION 

Standard synthesizer envelopes provide anywhere from two to four DC voltage settings over a triggering period. In practice, acoustically generated sounds have many variations of amplitude or filtration within a given articulation or generation. The use of a SW911A to couple envelopes together creates a much more complex series of voltage variations for the synthesist to use for the articulation of each sound.

SW911A DUAL TRIGGER DELAY
Status 
available
TECHNICAL SPECIFICATION 

Trigger Input:

V-trigger (internally converted to S-trigger)

Trigger Output:

V-trigger (internally converted from S-trigger)

Delay periodes:

2 msec to 10 sec

Power Requirements:

+/-15 Volt at + 25 mA / - 20 mA

Depth:

160 mm

12

SW912 ENVELOPE FOLLOWER

MUSICAL APPLICATION 

THe SW912 Envelope Follower is an extremely useful module for interfacing external sources with the many functions of the synthesizer, which require both control voltages and triggers to function. Filter or amplitude variations can be achieved by routing the audio signal to both the processing modules and the Envelope Follower. The control voltage of the follower circuit can raise or lower the cutoff frequency of a voltage controlled filter. At the same time, the Envelope Generator can be triggered by the V-trigger output of the follower, causing a VCA to gate the original signal above a certain amplitude. This latter operation can be very useful as a noise gate, closing down an audio signal when the level drops below a nominal setting. One further use involves generating random triggers from the Envelope Follower by utilizing white noise or pink noise as a signal input and carefully setting the threshold level to achieve a speed of trigger selection.

SW912 ENVELOPE FOLLOWER
Status 
work in progress
TECHNICAL SPECIFICATION 

Nominal Input impedance:

100k ohm

Nominal Output impedance:

69k ohm

Control Input impedance:

61k ohm

Control Output:

Connected to control input internally

Power Requirements:

+/-15 Volt at + 40 mA / - 35 mA

Depth:

160 mm

13

SW6401M BODE RINGMODULATOR

MUSICAL APPLICATION 

It was probably electronic music pioneer Karlheinz Stockhausen’s use of the ringmodulator that inspired an entire generation of rock musicians. Stockhausen’s Mixture (1964), for example, was written for a ring modulated symphony orchestra. Ringmodulation is often used to simulate the sounds of tuned percussion instruments that produce inharmonic frequency spectra, such as bells and chimes. It can also produce timbres that are difficult to achieve by any other method of synthesis. Among all signal processors, the multipliertype ring modulator takes a unique position since it is capable of converting existing sounds into new sounds with entirely different overtone spectra that do not resemble the original acoustical phenomena.

SW6401M BODE RINGMODULATOR
Status 
available
TECHNICAL SPECIFICATION 

Input Impedance program input:

47k ohm

Input Impedance carrier input:

47k ohm

Output Impedance:

680 ohm

Nominal Input Voltage:

1V RMS (higher levels will lead to distortion which can be an additional interesting effect)

Gain:

approx. 0

Frequency range:

0,15 kHz to 20 kHz

Power Requirements:

+15 Volt at + 90 mA

Depth:

160 mm

SW6401M BODE RINGMODULATOR

Original flyer Bode

Bode 6401 Ring Modulator 1967 as part of the Moog Music product range.

14

SW903A RANDOM SIGNAL GENERATOR

MUSICAL APPLICATION 

Almost all acoustically generated sounds one hears, at all times, contain some amount of random noise. Most obvious are wind, surf and thunder. Some amount of unpitched sound is evident in just about every environment. Acoustic instruments produce varying amount of unpitched sound along with specific notes. Drums, Tam-Tam, blocks, gongs and various other percussion instruments are all unpitched instruments. White and pink noise provides the synthesist with a basic source for simulating these instruments, as well as a source for recreating “environments”.
As an audio source, the Random Signal Generator is most often used in connection with filters to create a desired frequency band or correct spectral sweeps. The Random Signal Generator also provides a source of control voltage for filters, oscillators, amplifiers and other voltage controlled modules, producing interesting random modifications.

As a source for the Envelope Follower, random triggers can be produced as well as slowly varying DC voltage contours (with slow response time). Noise is also useful as a control source for sample and hold circuits and random sequencer triggers.

SW903A RANDOM SIGNAL GENERATOR
Status 
available
TECHNICAL SPECIFICATION 

Average level white noise:

-10 dBm (30 Hz – 20 kHz)

Average level pink noise:

-4 dBm (30 Hz – 20 kHz)

Power Requirements:

+/-15 Volt at + 35 mA / - 30 mA

Depth:

80 mm

15

SW994 MULTIPLES / SW995 ATTENUATORS

SW994 MULTIPLES / SW995 ATTENUATORS
Status 
available
TECHNICAL SPECIFICATION 

Depth:

45 mm

16

SWCP MULTIPLES & ATTENUATORS

SWCP MULTIPLES & ATTENUATORS
Status 
available
TECHNICAL SPECIFICATION 

Depth:

Approx. 58 mm

17

SW905 REVERBERATION UNIT

MUSICAL APPLICATION 

When a dynamically varying signal is applied to the input of the SW905, the output will consist of a series of closely spaced echoes, the subjective effect of which is similar to that of reverberation of sound. When a static signal is applied to the input of the SW905, the output will also be static. The SW905 will perform in this application like a formant filter, strongly coloring the timbre of any signal with appreciable harmonic content.

SW905 REVERBERATION UNIT
Status 
work in progress
TECHNICAL SPECIFICATION 

Power Requirements:

+/-15 Volt at + 20 mA / - 20 mA

Depth:

160 mm