Here you find a detailed report about the module A-105-4 (German language)

https://a100.ideenhase.de/2022/12/05/a-105-4-quad-poly-ssi-vcf/

As of now for the Midi keyboard electronic kit MKE a suitable front panel kit is availablle.

And we also offer a MKE package consisting of MKE electronic kit, front panel kit, keybed 61TP/8O, cable set and power supply.

Ströme: Trang & Flinky

Details are available here:

https://stroeme.com

https://en-gb.facebook.com/StroemeOfficial

An appropriate video has been released too:

https://www.youtube.com/watch?v=HemR1Jhi58s

Amazona tells the complete story (in German and French language only):

https://www.amazona.de/community/loumavox-der-vergessene-synthesizer-nicht-wirklich/

2: Basisklänge: https://www.amazona.de/synthesizer-workshop-modular-patches-2-basisklaenge

3: Ringmodulation: https://www.amazona.de/synthesizer-workshop-modular-patches-3-ringmodulation

4: Leadsound: https://www.amazona.de/synthesizer-workshop-modular-patches-4-lead-sound

A-135-2
Quad VCA /
Voltage Controller Mixer
available

Youtube-Video von Synth Anatomy: https://www.youtube.com/watch?v=IZLJNtpVw3E&t=46s

https://www.youtube.com/playlist?list=PLTnE9FqlS9Qg1ooh4-lqTc5ECOtVu38ye

A video that shows in details the equipment used by Biggi of GusGus is available on Youtube.

We are very proud of the two awards we received from Sonicstate during NAMM 2018:

• Best Modular (for the new polyphonic modules)

• Top Chap

Nick, thank you so much !

Here is the link to all Sonicstate awards:
http://www.sonicstate.com/news/2018/02/06/namm-2018-best-of-show-awards/

Link to the NAMM video:
https://www.youtube.com/watch?v=AFFVuWP8ZxQ

A-110-6 is a so-called Trapezoid Thru Zero Quadrature VCO. Because of it's unique trapezoid core it's totally different compared to other VCOs. But the trapezoid core is not the only specialty: it is also a quadrature VCO and features linear thru zero frequency modulation.
The term "quadrature" means in this connection that the oscillator outputs two trapezoid waves with 90 degrees phase shift. The same as sine and cosine of a standard quadrature oscillator like the A-110-4 or A-143-9. These waveforms are called TRASIN (trapezoid sine) and TRACOS (trapezoid cosine).
The term "Thru-Zero" means that even "negative" frequencies are generated. But this a bit a misleading term as negative frequencies do not really exist. "Negative" means in this connection simply that the TRASIN/TRACOS waves will stop when the linear control voltage reaches 0V and continue with the opposite directions as the linear control voltage becomes negative and vice versa.
The module has two control sections: linear and a exponential. The exponential section consists of the XTune control, the 1V/Oct input and the XFM input with the corresponding attenuator XFM. The exponential control voltage is the sum of these three voltages. The linear section consists of the LFrq control and the LFM input with the corresponding attenuator LFM. The linear control voltage is the sum of these two voltages. A dual color LED is used to display the polarity of the linear control voltage. The pitch of all outputs is determined by the control voltages of both sections. The linear section is used to control the pitch in a linear manner. When the LFrq control (LFrq means Linear Frequency Control) is fully CW the module works like a normal VCO and the LED lights red. The pitch is then controlled by the exponential section with the manual Tune control XTune and the exponential frequency control inputs 1V/Oct and XFM. 1V/Oct is used to control the pitch by a 1V/Oct CV source (e.g. sequencer or Midi/USB-to-CV interface). XFM is used to apply an exponential frequency modulation with adjustable depth (e.g. from an LFO or another VCO). As the LFrq control is turned counterclockwise starting from the fully CW position the frequency is lowered in a linear manner until the TRASIN/TRACOS waves (nearly) stop at the center position of LFrq (provided that no LFM signal is present). As the LFrq control is moved from the center towards the CCW position the waves start again but into reverse direction and the LED turns yellow. When the fully CCW position of LFrq is reached the module works again like a normal VCO. But much more exciting is the usage of the LFM input to modify the linear control voltage by an external control voltage (typically another VCO). Linear modulation by another oscillator using the thru zero feature in combination with the trapezoid waveforms generates audio spectra than cannot be obtained from any other oscillator without the thru zero function. The reason is that a "normal" VCO will simply stop as the linear control voltage becomes zero or negative. But a thru zero VCO will start again with "negative" frequencies as the the linear control voltage becomes negative.
The other waveforms (triangle, sawtooth, rectangle and sine) are derived from the TRASIN/TRACOS signals (triangle e.g. simply by subtracting TRISIN and TRICOS, SAWSIN and SAWCOS by switching the other waveforms). And all five waveforms are available as quadrature pairs (i.e. with 90 degrees phase shift).

A-138s is a simple but useful 4-in-2 mixing tool. It has four inputs available. Each input is equipped with an attenuator (Level) and a panning control that is used to distribute the signal to the left and right output. Beyond stereo mixing it is equally suited to create variable parallel routings. For example: Any of the four inputs may be routed in variable intensity to feed two filters.

You may regard the A-138s as a smaller version of the A-138m Matrix Mixer.

Inputs and outputs are DC coupled, i.e. the module can be used for the mixing of control signals too.

Note: Black versions of the grey knobs used in this module are available as spare parts. If some of the grey knobs (e.g. Pan) should be replaced by black ones they can be swapped easily by the customer. If applicable pay attention to order the knobs with 11.5mm diameter (A-100KSB in the price list / section spare parts).

A-135-4A

A-135-4A is the main module. It is very similar to module A-138p, but with voltage control for all parameters (except gain). A-135-4A contains four high quality voltage controlled amplifers (VCA) for each channel: one for the main level, two for panorama left/right and one for aux. The control scales for all parameters are linear. Altogether 16 VCAs are included in the module. High end linear VCAs manufactured by Curtis/USA are used (CEM3381). The 16 LEDs display roughly the amplification of the VCA in question. Module A-138o is used as output module for the A-135-4A. A-135-4A and A-138p can be connected together to the same A-138o to obtain e.g. four fully voltage controlled channels (A-135-4A) and four manually controlled channels (A-138p).

A-135-4B

This module is used to route the 16 external control voltage to the main module A-135-4A. These control voltages are available for each channel: Level (main loudness), Panorama, Aux, Mute
Each control voltage has an input socket and a polarizer control available. That way it's possible to adjust the depth and polarity of the external control voltage which affects the parameter in question. If the same CV (e.g. LFO or ADSR) is used e.g. for two panorama control inputs the result may be the opposite if the polarizers are adjusted accordingly (i.e. one positive and the other negative). The external control voltage is added to the voltage that is generated by the manual control on the A-135-4A main module. The sum of both voltages is used to control the VCA in question and is displayed with the corresponding LED on the A-135-4A module.

A-135-4C

Module A-135-4C is a four-fold envelope follower with ajustable attack and release time for each channel. The main function of the module is to derive four envelopes from the A-135-4A audio input signals. These voltages can be used to control parameters of the main module A-135-4A via the CV input module A-135-4B2. Typical applications are ducking (e.i. the signal of one channel is used to mute another channel more or less), as well as compressor and expander functions. For this the desired envelope output of the A-135-4C is patched to the CV input of the A-135-4B which is assigned to the parameters that has to be modified by the envelope signal. Intensity and polarity of the envelope influence to the parameter in question are adjusted by means of the corresponding polarizer control.
The module has four audio inputs and four envelope outputs available. The inputs can be normalled to the inputs of the A-135-4A by means of an internal 10 pin ribbon cable.
The four envelopes generated by the module are displayed by means of LEDs.

These modules are now available also as vintage versions:

A-100SSB is a combination of power supply and bus board with 8 connectors for A-100 modules.
Planned for applications with up to 8 modules and a max. current of 380 mA.
A-100SSB is available as ready built and tested unit and available September 2016.

Technical notes: Internally the A-100PSU3 is a +/-15V switching supply (wide range input 100...240V for mains voltage) followed by the classical linear regulation circuit of the A-100PSU2 that generates the required +12V and -12V. Only the +5V is a pure switching supply without linear regulation. We discovered that a pure 12V switching supply was not good enough for the modular system (especially the generated noise and the load regulation was not satisfying for all 12V switching supplies we tried). That's why we added the well-tried linear 12V regulation to the 15V switching supply. As the current for +12V and -12V is different we will specify in the future the currents for +12V and -12V separately for all modules. But as a rule each A-100 module consumes less current at -12V compared to +12V. The Excel planning file contains the detailed current specs for all A-100 modules: System Planner (Excel™).

An existing power supply (A-100NT12 or A-100PSU2) can be replaced easily by the new A-100PSU3 because the A-100PSU3 has nearly the same dimensions and the four mounting bolts are at the same positions. Nevertheless the replacement or installation has to be carried out by qualified personnel only because the correct wiring of the mains connection is essential. And it's essential that all parts that conduct mains voltage (cables, pc board, electronic parts on the pc board) are mechanically protected against any contact with the human body (touch-proof, e.g. by using a cover for the power supply). Otherwise there is Danger to Life ! Existing bus boards can be used. There is no need to replace the bus boards. Only if the +5V supply is required one has to add the cable(s) that connects the +5V terminal of the bus board(s) to the corresponding terminals of the A-100PSU3.

Temporarily the A-100 cases will be available in both versions (i.e. with PSU2 or PSU3). As soon as the A-100PSU2 are used up only cases with A-100PSU3 will be available. The cases with PSU2 and PSU3 can be distinguished by the label next to the mains inlet (mains voltage specification "100...240V" = A-100PSU3, mains voltage specification "230V" or "115V" = PSU2).

Even the scope of supply of the A-100 bus boards will change early in 2016. The bus boards will be equipped in the future with 4 instead of 3 connections cables. Cable #4 is required for the additional +5V connection. The price for the bus boards with 4 cables will be a bit beyond the version with 3 cables. The bus boards remain unchanged as they were prepared from the beginning since 1996 for the additional +5V. Only an additional cable for the wiring of the +5V is required provided that the +5V are used.

The following document shows the wiring of the A-100PSU3 with the bus boards and the mains inlet: A100PSU3_wiring.pdf. Laymen are not allowed to carry out these works ! Danger to Life ! 

Editor's choice: A-100

The full interview with Parallel Words on the US Electronic Musician magazine is now online:

http://emusician.com/tutorials/modular_odyssey