Details on the Transmission D4069-1TZAM VCO & Ring Mod Eurorack Modules

Published on Nov 22, 2013 heodesalciphron·163 videos

Details below.  Follow-up to this post. We have a new maker label and channel: Megaloceros.

Playlist: [just added more to the playlist - new video titles under the --- below.]

diy transmission VCO slow RM duo
Transmission VCO screams
transmission VCO module Bells and klangs
DIY transmission vco acid noise
transmission vco am fm
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transmission VCO sync fm tzam vactrol
acid transmission sDIY euro VCO double saw qmmg
DIY transmission VCO FM vs AM
transmission VCO ring mod lfo
DIY transmission VCO ring vactrol
DIY tupperware VCO
DIY VCO triangle + AM MOD 2
DIY VCO triange SYNC + AM MOD
DIY VCO triangle + AM MOD 1
diy transmission vco sync lpg
diy euro double vco sync
VCO diy double triangle
ringmod
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Googlish translation (original link to the page in French below):

"Construction of a dual oscillator unit made entirely by hand with simple electronic components, a soldering iron and a screwdriver.

Wikipedia: One of the Earliest musical instruments Utilizing a ring modulator May be the Melochord (1947) built by Harald Bode. It was a two-tone melody keyboard instrument with foot controllers and later added a second keyboard for control stamp, featuring a white-noise generator, controller envelope, forming and ring modulators filters for harmonics. The early Melochord WAS Extensively used by Werner Meyer-Eppler in the early days of the electronic music studio at Bonn University.

this is a double oscillator sawtooth wave as a main, and broken down into triangle sawtooth module. Frequency modulation is possible, but the goal of this module is primarily the ring modulation and amplitude modulation.

it is a dual VCO and a ring modulator, saw core, additionnal wave are: square, triangle and triangle shaped.

The idea for this module came to me after playing a EML 101 and a Moog Sonic Six, the ring modulator particularly interested me. I have several oscillators dedicated to frequency modulation in my modular, but no specifically designed for the amplitude modulation! So I created to find those special sounds. This module is built around simple circuits and archaic modulator, the sounds are raw, pretty close to my memory of the EML and even go much further. This module is focused on a form of amplitude modulation, ring modulation. Amplitude modulation was initially used in teletransmissions (long wave, medium wave, short wave), hence the name of the module. I wanted a module that refers to the buzz and the sound of a generator or power plant, a very electric module.

The idea of ​​this unit WAS inspired by the EML101 and the Moog Sonix Six sound. I have many VCO FM, AM VCO Any goal! The unit is built around a simple circuit, and a very early tour of the ring modulator, the thing called the real ring modulator, All which WAS used in AM radio transmissions. I wanted a VCO that sounds like a generator or an electric factory, an electric module.



After some tests I set on an architecture that would quickly have an interesting sound, and in particular:

the triangular wave struck me as giving the best results, but the square and sawtooth were not uninteresting
a carrier which can be shifted, which allows interesting morphing RM and AM effects and pulsation
an oscillator that can be synchronized to each other, made in the relevant audio modulator, synchronization must be unlocked for playing on and interference beats
After Some brainstorming and testing, the architecture WAS more or less fixed, the goal WAS Quickly to-have all of my favorite sounds. The MOST significant features was:

the triangle wave
shifting a carrier (offset) in order to accomplish achieve a kind of morphing Between RM and AM
synchronization of the oscillators, sync can be switched off to perform and beat interference
It was necessary that all the interesting sounds that I discovered during my tests can be quickly generated with the module, so I set up a little like Anthony Rolando modules, a number of connections by default. But to keep the flexibility of a module, all these connections can be broken, eg ring modulator is connected to the two oscillators, but it may very well be used independently with any other oscillator, simply by plugging in the expected entry.

Inspired from Anthony Rolando modules and in order to get all Quickly thesis sounds there is a lot of normalization, aim to keep all the Flexibility normalization can be broken, for instance the modulator is normalized to the oscillators, goal aussi can be used stand alone, Entering by signals in the dedicated inputs.

Amplitude modulation and ring modulation / AM & Ring modulation

The amplitude modulation is one of the oldest modulation techniques. It is very simple, it is simply to modulate the amplitude of a signal, low frequency or audio frequency.

Ring modulation is an old art modulation. Very simple, it is the modulation of the amplitude of a signal.

Make the ring modulation is equivalent to multiplying two signals, modulating a carrier wave by wave is multiplied. By modulating a modulating with which a carrier is 1 is 0, the Result is 0, when the carrier is 1, the result is 1, when the carrier is -1 Result is -1.

Think about multiplication of two signals, the modulator and the carrier. If the modulator is 1, and the carrier 0, 0 Will Be the result, if the carrier is 1, the result Will Be 1 if the carrier is the result -1 -1 Will Be.

In amplitude modulation, the carrier can not be negative, it must be a unipolar signal, always positive. If the carrier in a ring modulator is unipolar, a jacket for example, it will behave as amplitude modulation, ie as a VCA.

In amplitude modulation, the carrier cannot be negative, it must be a unipolar signal. If the carrier in a ring modulator is unipolar, the ring modulator Will act like a VCA.

Audio signals, lfo are generally bipolar, envelopes, triggers are generally unipolar.

Audio signals, are in general Bipolars LFO, envelopes, gates, trigger signals are generaly unipolar.

We can also make the analogy with frequency modulation, FM and FM-zero thru (through zero, the frequency of the modulating becomes negative if the carrier is negative), it would be the AM modulation and rings would be in the AM thru-zero.


(Source: http://en.wikipedia.org/wiki/File:Amfm3-en-de.gif)

Thru-zero FM FM is Where the carrier and the modulator frequency Becomes negative, you can think about ring modulation like thru-zero AM, When the carrier Becomes negative, the amplitude of the modulator Becomes negative.

In the frequency domain, the amplitude modulation produces a pair of sidebands for each sinusoidal component of the carrier and the modulating, their frequencies are the sum and difference of the carrier and the modulating.

Creates AM side bands, the frequencies of Those bands are the sum and the difference of the modulator and carrier frequencies.

Due to these frequency shifts, in audio, ring modulation gives easily metal stamps.

Then you get Easily Some metallic timbres.

(Source: http://en.wikipedia.org/wiki/File:Am2_spec.gif)

In addition to the well-known effect, the amplitude modulation can be used as VCA, an inverter, to the tremolo, or a frequency doubler (with identical sine input frequencies).

Outside the obvious use, a ring modulator can be used as a tremolo, a VCA, an inverter, as gold frequnecy double (sine at same frequency to Both inputs).

Features / Functionnalities

Waveforms / Waves

The module consists of two oscillators. The first is called the second carrier and modulating. The principal wave is a sawtooth, this sawtooth derived square and the triangular wave. Both oscillators are essentially the same, in addition to the modulating means to close the triangle of a sinusoid, the signal is rounded up, but still sharp down, the triangle is softened. The carrier wave has a modulated pulse width of the square wave.

We have two oscillators in the modules, the modulator and the carrier. The VCO core are saw, and Then we get square, triangle and triangle shaped (modulator only). Pulse width modulation on the carrier

Sawtooth / saw


square / square wave


triangle / triangle


deformed triangle (ARC) / triangle shaped


Synchronization / sync


ring modulation triangle


triangle ring modulation distortion


Frequencies and frequency modulation / FM Frequency and

The frequency of the two oscillators is controllable through voltage 1V/Oct inputs, but also at secondary entrances frequencies.

Oscillators are calibrated and track at 1V/Oct, the frequency can be modulated with the frequency entries.

the carrier frequency may be related to the frequency of the modulating switch through the junction height, the frequency modulation inputs remain active and independent.

Carrier frenquency can be linked to the entry with the modulator 1V/Oct Junction heights switch.

There is an internal wiring that connects the triangular carrier signal with the modulating frequency of the input, and vice versa, the connection frequency is attenuated by the buttons. These connections are cut as soon as a cable is plugged into the respective inputs. These circuits allow modulation summary oscillator frequency.

Frequencies of the oscillators are normalized to the other oscillator frequency and attenuated with the frequency controls. Makes this a fast and easy cross-FM modulation. Those normalizations are broken by Inserting a signal in the inputs.

Frequency modulation is clean at low frequencies and becomes very noisy at high frequency, this is probably due to the fact that the heart of the oscillator is not a triangle, but it can still be used as an excellent generator of noise ;) ( see video noise acid).

FM is clean at low frequencies, and Become more and more dirty as the frequency grow, probably Because the VCO is not a core triangle, aim Then It Becomes a very interesting ;) noise generator (see video noise acid).

synchronization

Modulating the oscillator can be synchronized to the sawtooth carrier.

The modulator can be synchronized to the saw of the carrier.

amplitude modulator

The modulator multiplies the two input signals, modulating the one hand, one can select the triangle, sawtooth or square, the carrier on the other side.

The ring modulator multiply Both input signals, the wave shape is selectable: triangle, saw, square.

The two input signals have attenuators and past a certain threshold they are distorted by the modulating circuit. There is an electric and distortion grating.

Signals are attenuated, Effective a certain ratio the signals are distorted by the ring modulator, All which is very good :).

At the carrier is a second mixed signal can thus shift the shift from a ring modulation to amplitude modulation. This can be rectified through the unipolar selector + / bipolaire/unipolaire-, it is a simple rectification based diode.

The carrier can be mixed with Reviews another signal by shifting the carrier we can go from AM to RM. The carrier can aussi go through a half-wave rectification circuit it is a simple diode.

Not plugged into the input jack, the shift button is a simple offset, with a signal connected, the button becomes an attenuator for the signal to enter here the typical signal is a low frequency oscillator (LFO). The opto-isolation switch is used to connect the circuit photocoupler (Vactrol), with a trigger input (trig, gate), we obtain a form of resonance in the modulating circuit.

The shift button it is a single offset, aim can be connected to-any external signal and Then Becomes an attenuator, here we can enter a LFO or an envelope Opto-isolation. Introduce a Vactrol switch in the system and let use a single gate Without any envelope to make the ring modulator ringing.

The modulator output is in the upper right. The attenuator permits the left, the selection, mixing or modulating the carrier with the outlet, allowing in some cases the sound swell.

For more fatness, the output of the ring modulator can be mixed with the modulator or the carrier.

drawings and construction / schematics"

See http://www.dendrobate-magnetique.org/synth/article44/transmission-4069-vco-am (Googlish)