Elby Designs ED104 Dual Lin Log VCA w/ VC Panner

Note: Auction links are affiliate links for which the site may be compensated.
via this auction
Perfect Circuit Audio (RSS)

"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

Note: Auction links are affiliate links for which the site may be compensated.
via this auction

"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

Note: Auction links are affiliate links for which the site may be compensated.
via this auction
Perfect Circuit Audio (RSS)

"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

Note: Auction links are affiliate links for which the site may be compensated.
via this auction
Perfect Circuit Audio (RSS)

"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

Note: Auction links are affiliate links for which the site may be compensated.
via this auction
Perfect Circuit Audio (RSS)

"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

Note: Auction links are affiliate links for which the site may be compensated.
via this auction
Perfect Circuit Audio (RSS)

"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

Note: Auction links are affiliate links for which the site may be compensated.
via this auction
Perfect Circuit Audio (RSS)

"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

Note: Auction links are affiliate links for which the site may be compensated.
via this auction
Perfect Circuit Audio (RSS)

"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"

Elby Designs ED120 Chaotica Chaos Generator

Note: Auction links are affiliate links for which the site may be compensated.
via this auction
Perfect Circuit Audio (RSS)

"Make your patches evolve with chaos!

The ED120 is a multi-featured, autonomous, third-order chaos circuit with the following functions:

A third order system with a total of four nonlinear elements in the circuit path to provide a wide range of chaotic signals.

Exponential voltage control of rate (frequency) over a wide range, from creeping sub-audio rates to well up into the kHz audio range. Linear voltage control of loop damping, gain and offset. Many interesting sweep and modulation effects are enabled by these control inputs.

A Reset/Inhibit input which allows the system to be set to zero voltage at all three integration stages. This has many interesting uses. For example, the chaos path's evolution can be followed by varying the rate of a series of reset pulses. By limiting the range of an attractor's evolution, one can produce interesting and complex periodic waveforms.

Voltage outputs for all three system variables, X, Y, and Z.

Features

Rate knob
Rate CV In with level knob
Damp level knob
Damp CV In with level knob
Offset knob
Offset CV In with level knob
Gain level knob
Gain CV In with level knob
NL Drive level knob
Tame/Wild switch
Eyes switch
Reset-Inhibit input"

Elby Designs ED102 Octave Volts Hertz CV Processor

Note: Auction links are affiliate links for which the site may be compensated.
via this auction
Perfect Circuit Audio (RSS)

"The ED102 is ideal if you want to upgrade your synthesizer by adding on other synthesizer units having different kinds of keyboard control voltage and trigger signals.

The built-in, fully adjustable log amp, anti-log amp, and trigger processor ensure complete system flexibility and compatibility between any presently voltage controlled synthesizer. In order to get the most out of your ED102, please read this owner's manual carefully before use. The ED102 Hz/V/Oct Converter is designed for the purpose of connecting V/Octave synthesizers with Hz/V synthesizers. This sophisticated signal processor greatly enhances the performance possibilities of your synthesizer.

Among presently available music synthesizers, there are two different types of control system used for the VCO (voltage controlled oscillator) and EG (envelope generator). One of these systems is used by Korg and Yamaha; the other is employed by every other synthesizer manufacturer. The ED102 provides you with a way to change the control signals of one system into the control signals used in the other system. In this way, it acts as an interface so that any two synthesizers can be used together, provided that the synthesizers are equipped with the conventional input and output jacks for control
voltage and trigger or gate signals.

CV systems

In the Hz/V system, the VCO oscillator frequency is proportional to the control voltage whilst in the V/Octave systems the oscillator frequency changes one octave for every one volt (1V) change in the control voltage. Since an increase of one octave means that the frequency is doubled, each increase of one volt in the control voltage means a doubling of VCO frequency.

The problem with the V/Octave system is that it must employ a log amp in order to double the frequency for each one volt increase in the control voltage. Log amp circuitry can, unfortunately, be very unstable because of its sensitivity to temperature changes. This causes so many problems that most professional musicians automatically assume that synthesizers always have unstable pitch. When Korg developed their first Korg synthesizer, they decided that such a circuit was entirely unsuitable for a musical instrument. So, instead they invented their own unique, patented circuit in which the keyboard voltage (which is the VCO control voltage) itself doubles for each one octave increase in pitch.

Four Sections

Log Amp: This changes a Hz/V type keyboard CV (control voltage) output into a V/Octave type of CV. Use the Log Amp to change the control signal from a Hz/V synt
hesizer into a signal you can use with a V/OCT synthesizer.

Hz/V input (0 ~ 15V)
Oct/V Output (-12V ~ +12V)
Frequency knob: Bi-polar offset of frequency
Width knob: Bi-polar control of width of the output
Antilog Amp: This changes a V/Octave type of keyboard CV output in to a Hz/V type of CV. Use this Antilog Amp when you want to control a Hz/V synthesizer, such as a Korg, by means of a unit that uses the V/OCT system.

Oct/V input (-4V ~ +4V)
Hz/V output (-12V ~ +12V)
Frequency knob: Bi-polar offset of frequency
Width knob: Bi-polar control of width of the output
Adding Amp: This can be used for mixing control voltage signals or sound signals. When not plugged into an outlet, the adding amp operates as if -5V and +5V inputs were connected to its two channels. Therefore, depending on how you set up your equipment, you can also use the adding amp as a voltage supply, or to shift a control voltage to a higher or lower value, and so forth.

Two inputs each with level knob
Mix output
In 1 normalled to a +5V DC signal
In 2 normalled to a -5V DC signal
Trigger\Gate: This lets you change either type of trigger signals, S-Trig or V-Trig, into the kind of trigger signal you need by means of the Reverse switch.

2 Identical sections featuring:
Input (Vth = +2.5V)
Output (0V ~ +15V)
Reverse Switch
LED Indicator"