A-110-3 Triangle Thru Zero VCO
Vorankündigung / preliminary

standard version custom version
(NAMM 2016)

A-110-3 is a Thru Zero VCO with triangle core. 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 triangle wave will stop when the linear control voltage reaches 0V and continue with the opposite direction 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 the 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 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 triangle wave (nearly) stops 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 wave starts again but into reverse direction and the LED changes it's color. 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 generates audio spectra than cannot be obtained from an 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.

Internal waveshapers are used to generate the additional waveforms sawtooth an rectangle.

The custom version is only a design study made with a self adhesive foil printed by a color laser printer. There are no plans to offer this version of the module. But you may use the Coreldraw file on our website A100_System.cdr to design your own front panel. It includes all currently available front panels and you may add your own background or change the size, font or color of the lines, words and symbols. That way a personal module custom module can be realized by printig the design on an self adhesive foil (e.g. Avery Zweckform 3480) and stick the foil to the module. For this the module has to be dismantled. Knobs in different colors are also available (please refer to the price list, section A-100 accessories).

Latest news (as of June 2016):
The module will be probably not released because we are working on a thru zero version of the A-111-2 module which is also triagle based.


Breite/Width: 8 TE / 8 HP / 40.3 mm
Tiefe/Depth: ? mm (gemessen ab der Rückseite der Frontplatte / measured from the rear side of the front panel)
Strombedarf/Current: ? mA

Preis / Price: ~ Euro 150.00
Liefertermin  / date of delivery: summer 2016 (standard version) the module will be probably not releassed, as we are working on a thru zero version of the A-111-2
All features, specifications, prices, date of delivery are still without obligation
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