Ian Fritz modules in 4U
Teezer Through-Zero FM VCO
This module is a sawtooth-based VCO capable of frequency modulation (FM) extending past zero frequency into the negative-frequency regime. Thru-zero FM provides a much wider and richer variety of sounds than "ordinary" (positive frequency only) FM.
The negative-frequency version of a waveform is simply a time-reversed replica of the original waveform.When a VCO is modulated through zero frequency, the waveform slows down to a stop and then speeds back up in the reverse direction. Here is a picture of the core sawtooth wave being modulated to negative frequencies. On the left side of the picture the wave is a down ramp, and on the right side it's an up ramp, with the zerofrequency point being at the broad dip.
The Teezer's output waveforms also include triangle and sine waves, for producing sounds with fewer high harmonics, as typically used for bell sounds, train whistles, and so on. The unit also features a variable synchronization control that can be adjusted over a range of settings from hard sync to a fairly loose soft sync.
The module can also serve as a highly accurate and stable "ordinary" VCO (i.e., without the deep FM), with upramp, downramp, triangle and sine output waveforms.
3-Input Unity Gain Mixer
All-In AD/AR Envelope Generator
This novel envelope generator (EG) provides a versatile, cost-effective alternative to other designs. It will take just about any signal you feed it and generate an envelope. For example, its main input can accept either a trigger or a gate signal. 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! An auxiliary circuit produces a delayed, fixed-width pulse (monostable, or "Mono") which also drives the EG circuitry. This 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, noise source or chaos generator. A dedicated output jack for the pulse generator allows other, independent, timing applications.
2x 4x4 (All-In Plus) AD/AR Envelope Generators
This novel envelope generator (EG) provides a versatile, cost-effective alternative to other designs. It features four input modes and four output signals, so it is called the 4x4 EG. (It is an extension of the earlier All-In EG module.) Here's what it can do:
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.
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.
A momentary push button switch on the panel generates an input trigger pulse to generate an AD envelope.
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
This is the main envelope output.
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.
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.
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.
ChaQuO Chaos Generator and Quadrature Oscillator
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.
The QO has a frequency span of ~0.03 Hz to ~3 kHz in two overlapping ranges.
This is a circuit 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. Two of these circuits are contained on a single board.
This module may be used as a regular sample-and-hold circuit, if the sampling pulse is fed to the Timing Signal input and the signal to be sampled is fed into the Main Signal input. It also makes a great variable-threshold trigger generator.
Chaotica Voltage-Controlled Chaos Generator
This circuit is a multi-featured, autonomous, third-order chaos-generating circuit. Its features include (1) a third order response with a total of four nonlinear elements in the circuit path, (2) switch selectable nonlinear elements, (3) voltage control of rate, loop damping, gain and offset, and (4) a reset/inhibit input which allows the system to be set to zero voltage at all three integration stages.
All the above information copied from Appliancide: http://appliancide.blogspot.com/2014/06/now-available-from-uglysound.html
No info about availability.submitted Feb 17th 2014, 20:12 by DomMorley | last Change Jun 6th 2016, 09:33 by isvisible
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