Elby Designs CGS762 Slope Detector Eurorack Module

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"The CGS762 Slope Detector is an event-driven gate/trigger generating device.

It monitors a control voltage, and responds according to what that voltage is doing. If the voltage is rising, the slope detector gives a gate output (approx. 5V) on its "Rising" output. Likewise, if the voltage is falling, the slope detector gives a gate output on its "Falling" output. The duration of this gate signal depends on the incoming CV and the setting of the sensitivity pot. When the CV is remaining constant, the "Steady" output activates.

These gate signals can be used to fire envelope generators dependent on the action of the CV, for example opening a filter when a melody is rising in pitch, and closing it when the melody is falling in pitch. It can also be used to generate gate signals from LFOs, envelope generators, to advance sequencers etc.

The sensitivity pot allows the slope detector to work with either relatively fast events, like the edges of a square wave pulse train, or very slow events, such as the sine output of an LFO being used to drive filter/phaser sweeps.

Features

Sensitivity level knob
High/Low Sensitivity switch
CV input
Rising, Steady, and Falling gate outputs
LED inidicator for each gate output"

Elby Designs ED103 MIDI2SDS(X) MIDI to Trigger Converter

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"A handy module for converting MIDI data to trigger pulses.

The ED103-MIDI2SDS(X) is an 8-channel MIDI note to Trigger unit suitable for use with a variety of drum machines including the SDS range from Simmons for which it was originally designed.

The unit has 8, velocity sensitive, trigger outputs which can be assigned to a specific MIDI Note using the `LEARN’ mode.

The period of the gate-on time can be adjusted using the onboard trimpot (P101) from approximately 1mS to approximately 130mS. Factory setting is 10mS.

The amplitude of the trigger outputs can be adjusted using two onboard trimpots. P151 sets the lower voltage level and is factory set for 0V. P152 sets the upper voltage level which can extend from around 5V to 10V. The factory setting is 5V.

It also has a 'learn' mode, which lets you assign different notes and channels to different triggers. You could, for example, have four triggers on channel 10, two more on channel 11, one on channel 15 and one on channel 2.

To use the `learn’ mode, you simply hold down the LEARN button until all the LED’s come on. Then the LED for the first channel to be set will flash once every second, indicating that it is waiting for a note to be assigned to trigger it. Once received it will trigger its output, and then flash the next LED showing it is waiting for the next trigger assignment. Repeat for all 8 triggers, if you don't want to reprogram all the outputs then simply wait, the unit will time out after roughly 4 seconds, saving any changes to trigger notes in FLASH memory.

8 LED’s indicate the status of each of the output triggers and are also used during LEARN mode to assist the user whilst programming the board.

Features

MIDI In
Learn button: Engages MIDI learn mode
8 Trigger outputs
8 LED indicators
Easily calibratable via trimmers and dip switches on the back (See manual)"

Elby Designs ED104 Dual Lin Log VCA w/ VC Panner

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"A versatile Dual VCA with onboard voltage controlled panner!

The ED104 is two seperate VCAs that are also routed to a voltage controlled panner. The response of the VCAs is switchable between linear and logarithmic (exponential). The module allows for awesome panning effects and can of course be used as two standalone VCAs.

Features

Audio In per VCA
Audio Out per VCA
CV In per VCA, with level knob
Log/Lin button with LED indicators: Choose linear or logarithmic response
Panner knob
Pan CV input
Pan Audio"

Elby Designs ED108 ChaQuO Chaotic Signal Generator

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"A healthy dose of chaos for your eurorack modular!

The ED108-ChaQuO is a combination of a Chaos Generator (CG) and a Quadrature Oscillator (QO) and was designed by Ian Fritz.

The main function of this module is a versatile chaotic signal generator (CG). Chaotic signals are signals that have varying degrees of interesting irregularity without actually becoming random. This CG is an analog electronic simulation of the classical driven double potential-well problem, with the addition of extra gain in the circuit loop, and an extra cross-coupling path to extend the range of chaotic patterns available.

The double-well system is a "second-order" system and therefore requires an external driving signal. This is provided by the second part of the module, a sinusoidal Quadrature Oscillator (QO).

The two parts of the module may be used together or separately. The CG may be driven by any output of the built-in QO or by any external oscillator. The QO may drive the CG or be used independently as a four phase oscillator for the usual spatial modulation and other applications. Both parts of the module are manually controlled, to provide a compact, cost-effective unit. The QO has a frequency span of roughly 0.03 Hz to 3 kHz in two overlapping ranges.

This is a unique and complex module, we advise you to read the manual thoroughly to get the best grasp of how to use it.

Features

Chaos Generator:

Rate knob
Damp knob
Couple knob
Gain knob
X, Y, and Z outputs
Drive level knob
External Drive Input
Quadrature Oscillator:

Coase tuning knob
Fine tuning knob
Hi/Lo frequency range switch
4 outputs with different phases: Sin+ (0°), Sin- (180°), Cos+ (90°), Cos- (270°)"

Elby Designs ED109 TGTSH Complex Sample & Hold

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"The Elby Designs Threshold/Gate/Trigger/Sample/Hold isn't your everyday sample and hold!

The ED109-TGTSH is a module that combines two important synthesizer functions. It produces trigger and gate signals whenever a "timing" signal input crosses a user-defined threshold. At the same time, the trigger pulse fires a high-performance sample-and-hold circuit that samples a second "main" signal input.

The timing signal waveform would, typically, be a waveform with a -5V to +5V swing. This signal can range in frequency from around 0Hz to well over 5kHz. The triangle output from a good LFO would be a good example.

Features

Timing Signal input
Threshold knob
Modulation input with depth knob: For modulating Threshold
Gate output
Trigger output
Main input
Main output
Main Level knob"

Elby Designs ED113 5-pulser Waveshaper Module

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"A versatile waveshaper designed by Ian Fritz.

The ED113 5-Pulser waveshaper produces a train of pulses whose number (and widths) are varied with a control voltage. At the lowest control voltage a single square wave is put out, whereas at the highest voltage a train of 5 pulses spanning less than half of the total wave period is produced. This produces all kinds of interesting effects!

Features

Input
Ouput
CV input with level knob
Shape knob
4 switches for altering the sound"

Elby Designs ED114 4x4 AD AR Envelope Generator

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"The ED114 4x4 AD/AR envelope generator provides a versatile alternative to other designs.

It consists of two parts: the main AD/AR envelope generator itself and an auxiliary delayed pulse generator. The pulse generator output can be used as a trigger or gate to control the main envelope circuitry, or it may be used independently as an external timing/gating signal.

The circuit has four input modes and four output signals, hence its name.

Input modes

Trigger/Gate: This is the main input. It will take just about any signal you feed it. Driven by a trigger pulse, the unit's output is an attack-decay (AD) envelope. Driven by a gate its output is an attack-release (AR) envelope. And you can even use a continuous signal like an LFO for the gate.

Cycle: A pulse is generated at the end of the envelope decay/release and can be switched back to the input to produce a repetitive AD output signal.

Manual Trigger: A momentary push button switch on the panel generates an input trigger pulse to generate an AD envelope.

Delayed Pulse: An auxiliary circuit produces a delayed, fixed-width pulse, which may be switched to drives the EG circuitry (Pulse - EG). The pulse may be initiated by any signal with a positive-going 1.5 V crossing, for example, a trigger pulse or a waveform from an LFO etc.

Output signals

AD/AR: This is the main envelope output.

EOE Trigger: A trigger pulse is generated when the envelope falls to near zero (end of envelope). This pulse may be feed back to the input to generate a cyclic signal, or may be used externally for cascading more than one unit or for other timing applications.

Delayed Pulse: The delayed pulser's output is available at the front panel, to use separately from or in conjunction with the EG itself. The delay time is retriggerable, ie if multiple triggers are received during the delay phase, the end of the delay phase is determined by the last received trigger. The pulse width phase is not retriggerable, ie a fixed pulse width always occurs.

EOP Trigger: This is a trigger pulse generated at the end of the delayed pulse (end of pulse). This pulse may used for a variety of timing functions, such as cross-coupling with the EG to generate a cyclic signal with a zero-voltage segment, for cascading more than one unit or for other external timing applications.

Features

Manual Trigger button
Cycle switch
Pulse-EG switch
Attack time knob
Decay/Release time knob
Delay time knob
Pulse Width knob
LED indicators
Trigger/Gate input
Delay input
EOE Trigger output
AD/AR output
EOP Trigger ouput
Delayed Pulse output"

Elby Designs ED117 Wavolver II Waveshaper Module

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"The ED117 produces a wide variety of evolving waveforms in response to an external control voltage.

Driven by a triangle wave, it can produce an output wave that continuously evolves from a triangle to an antisymmetric pulse waveshape. In addition, the section of the antisymmetric waveform that is at a zero-volt level can be replaced by an evolving series of successively folded triangular sections, somewhat in the spirit of the popular Serge Wave Multiplier.

The Wavolver II is a novel, versatile waveshaper that generates a special kind of double-pulse waveform along with an extra folded-wave section added between the pulses. It generates a wide range of timbres from a gentle sine or triangle wave to a very rich signal with multiple zero-crossings per cycle. The module can be driven by any continuously varying signal. For simplicity let's assume a tri wave at the input. The circuitry works by only passing the input signal when its amplitude (positive or negative) is above a threshold set by the pulse width control. When it's below the threshold the output signal is zero. The signal consists of steeple-shaped pulses that can be swept from narrow for high harmonic content to full width, which results in a triangle wave (pulse width and modulation controls). This represents a wider range of timbres than from the familiar rectangular pulse generators, which give a square waves at full width.

In addition to the double-pulse generator, the Wavolver II has circuitry to generate a series of evolving folded waves between the pulses. These are mixed into the output via the "fold mix" control. The folder output is available separately to allow individual processing of the double pulses and the folds.

The double-pulse signal consists of a positive pulse and a negative one, and the resulting signal has odd harmonics only. The capability to produce waves with strong, odd-only harmonics is practically never seen in classical vco/waveshaper designs. There is a wide area of timber space available here that has been largely ignored. Adding the folder output produces high-energy even harmonics in the signal's spectrum.

In the Wavolver II there are several ways to modify the basic waveforms discussed above. First, the amplitude of the second pulse can be continuously tuned from -5V (as shown above) to +5V (pulse 2 amplitude control). At full positive amplitude, the signal has two identical positive pulses, resulting in a signal at twice the frequency of the driving signal. Waves with the second harmonic stronger than the fundamental are musically useful, as some acoustic instruments (bowed strings) share this characteristic.

Another way to change the basic waveforms is to add a DC voltage offset to the input signal (input offset control and modulation). A positive offset makes the first pulse stronger and wider and at the same time it makes the second pulse weaker and narrower. Again this adds even harmonics into the output spectrum and results in some interesting timbres, especially when modulated.

Finally, the wave shape can be modulated by modulating the input waveform. There are many ways to do this, of course.

Features

Input Offset Modulation input with Depth and Level knob
Pulse Width Modulation input with Depth and Level knob
Bi-polar Pulse 2 Amplitude knob
Fold Mix knob
Input
Main Out
Folder Out"

Elby Designs ED115 SH Noise Eurorack Module

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"The ED115 – SH-Noise is comprised of a Noise Generator section and a Sample & Hold section in a 4HP module.

Noise Generator

White noise: This module uses the noise produced by the base-emitter junction of an NPN transistor, which is reverse-biased. The noise is amplified to a level of about 10V peak-to-peak.

Pink noise: The pink filter is a 3db/octave filter which is pretty linear across the range 10 Hz to 15 kHz to within 1db across the full 50db range. A final stage buffer-amplifier sets the output level to around 10V peak-to-peak.

Violet noise: The violet filter has two frequency dependent elements in the feedback path. The first feedback element on its own would produce a 6db/octave rise in the gain of the amplifier from 0db at 0 Hz via 3db at 9 Hz to 20db at 90 Hz. the second feedback element on its own would produce a 6db/octave fall in gain from 0hz to 1khz above which the gain would remain constant at 0db.

The combined effect of these feedback elements is that below 90 Hz the 6db/octave rise and 6db/octave fall cancel out, giving a gain of 20db. Above 90 Hz the gain falls at 6db/octave to 0db at 1 kHz, above which it remains constant. The result being that the bass end of the noise spectrum is boosted and "colored" noise is available at the violet output. A final stage buffer-amplifier sets the output level to around 10V peak-to-peak.

Random noise: The random noise output is a 12db/octave lowpass filter which passes only the very low frequency components to produce an extremely low frequency "random voltage". Fluctuations of the random voltage are displayed on an LED indicator.

By default, the random output is an analogue voltage with a nominal range of around 10V peak-to-peak. However an onboard jumper allows this output to be steered through a dual comparator to provide a digital output.

The digital-random output generates +5V output whenever the random voltage is greater than around +2V, a -5V output when the random voltage drops below -2V and a 0V output when the random voltage is within the range -2V to +2V.

Sample & Hold

The sample & hold section takes an instantaneous sample of the input signal and presents it to the out output. The resultant output is a "random voltage" that changes on each positive edge of the sample input.

The sample connector is normalized to the random output of the noise section while the in connector is normalized to the white output (an onboard jumper allows the user to change this to either the pink or violet outputs if desired) of the noise section. Inserting a jack in to any of these connectors will allow an external signal to be used instead.

Features

White Noise output: Normalized to the S&H input
Pink Noise output
Violet Noise output
Random Noise ouput: Normalized to the sample input
Sample & Hold input
Sample input
Sample & Hold ouput
2 LED indicators"

Elby Designs ED116 SH Noise Expanded Module

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"The ED116 Extended SH-Noise is the same circuit as the ED115, but adds flexibility providing manual settings for the Red/Blue content of the Violet noise source and Rate control of the Random noise source.

Noise Generator

White Noise: This module uses the noise produced by the base-emitter junction of an NPN transistor, which is reverse-biased. The noise is amplified to a level of about 10V peak-to-peak.

Pink Noise: The pink filter is a 3db/octave filter which is pretty linear across the range 10 Hz to 15 kHz to within 1db across the full 50db range. A final stage buffer-amplifier sets the output level to around 10V peak-to-peak.

Violet Noise: The violet filter has two frequency dependent elements in the feedback path. The first feedback element on its own would produce a 6db/octave rise in the gain of the amplifier from 0db at 0 Hz via 3db at 9 Hz to 20db at 90 Hz. the second feedback element on its own would produce a 6db/octave fall in gain from 0hz to 1khz above which the gain would remain constant at 0db.

The combined effect of these feedback elements is that below 90 Hz the 6db/octave rise and 6db/octave fall cancel out, giving a gain of 20db. Above 90 Hz the gain falls at 6db/octave to 0db at 1 kHz, above which it remains constant. The result being that the bass end of the noise spectrum is boosted and "colored" noise is available at the violet output. A final stage buffer-amplifier sets the output level to around 10V peak-to-peak.

Random Noise: The random noise output is a 12db/octave lowpass filter which passes only the very low frequency components to produce an extremely low frequency "random voltage". Fluctuations of the random voltage are displayed on an LED indicator.

By default, the random output is an analogue voltage with a nominal range of around 10V peak-to-peak. However an onboard jumper allows this output to be steered through a dual comparator to provide a digital output.

The digital-random output generates +5V output whenever the random voltage is greater than around +2V, a -5V output when the random voltage drops below -2V and a 0V output when the random voltage is within the range -2V to +2V.

Sample & Hold

The sample & hold section takes an instantaneous sample of the input signal and presents it to the out output. The resultant output is a "random voltage" that changes on each positive edge of the sample input.

The sample connector is normalized to the random output of the noise section while the in connector is normalized to the white output (an onboard jumper allows the user to change this to either the pink or violet outputs if desired) of the noise section. Inserting a jack in to any of these connectors will allow an external signal to be used instead.

Features

White Noise output: Normalized to the S&H input
Pink Noise output
Violet Noise output
Random Noise ouput: Normalized to the sample input
Sample & Hold input
Sample input
Sample & Hold ouput
2 LED indicators
Rate knob for Random noise
Red and Blue level knob for Violet noise"