A-110-6 is a Trapezoid Thru Zero Quadrature VCO. The module is based on an idea by Donald Tillman from 2003 but has been revised for the use of modern electronic circuits (no OTAs/CA3280). 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. Other waveforms like triangle, sawtooth, rectangle and sine can be obtained 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 will be available as quadrature pairs (i.e. with 90 degrees phase shift). \n \n \n
    \n
  • Width: 12HP
  • \n
  • Depth: 61mm
  • \n
  • Current Consumption: +12V : 80mA / -12V : 70mA
  • \n

Product Specs

Condition
Mint (Used)
Mint (with inventory) items are in essentially new original condition but have been opened or played.learn more
Brand Doepfer
Model A-110-6
Categories Modular Synths, Eurorack

Great synth, great bass sounds

Noa S. - March 28, 2020

thnx

Lukáš S. - March 20, 2020

Much to my surprise,this arrived this morning.

Topher M. - March 16, 2020

Everything perfect! Thank you very much

André S. - March 09, 2020

Kentaro N. - March 06, 2020

Accepted Payment Methods

Shipping Policy

Available for local pickup from Paris, France

Ships from Paris, France to:

United States
$33.86
France
$0.00
Europe (Non-EU)
$24.83
European Union
$16.93
Everywhere Else
$56.43

L’article sera expédié en colis suivi dans les pays énumérés. Pour négocier les frais d’expédition vers d’autres destinations, merci de m’envoyer un message.

Tax Policies

Taxes are charged in the following regions either by the seller, per their tax policy, or by Reverb as a Marketplace Facilitator:

Location Tax Rate
European Union 20.0%
FR 20.0%
Tax is calculated automatically in checkout for the following U.S. states:
Alabama*
Alaska*
Arizona*
Arkansas*
California*
Colorado*
Connecticut*
District of Columbia*
Georgia*
Hawaii*
Idaho*
Illinois*
Indiana*
Iowa*
Kentucky*
Maine*
Maryland*
Massachusetts*
Michigan*
Minnesota*
Nebraska*
Nevada*
New Jersey*
New Mexico*
New York*
North Carolina*
North Dakota*
Ohio*
Oklahoma*
Pennsylvania*
Rhode Island*
South Carolina*
South Dakota*
Tennessee*
Texas*
Utah*
Vermont*
Virginia*
Washington*
West Virginia*
Wisconsin*
Wyoming*
*Marketplace Facilitator State. Reverb collects tax on the sellers behalf. Learn More

Return Policy

Return Window

This product can be returned within 7 days of receipt.

General Terms

Items must be returned in original, as-shipped condition with all original packaging and no signs of use. Buyer assumes responsibility for all return shipping costs unless the item was not received as described.

Refunds

Buyer receives a full refund in their original payment method less any shipping costs.

Unavailable for Purchase

This listing is temporarily unavailable while the seller is away.

Simple shield
Buy With Confidence
Reverb Protection has you covered. We provide a safe community for finding the gear you want.

Modularsquare

Paris, France
Joined: Feb 2018

Seller Achievements