doepfer a-110-4 thru zero quadrature vco price : $160.00
a-110-4 thru zero quadrature vco special edition price : $175.00
a-110-4 amplifier kit price : $36.00

a-110-4 is a so-called thru zero quadrature vco. the term "quadrature" means in this connection that the oscillator outputs sine and cosine waveforms simultaneously. 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 sine/cosine waves 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 (red = positive, yellow = negative). the pitch of the sine/cosine 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 quadrature vco (e.g. like the a-143-9) and the led lights red (red = positive). 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 sine/cosine waves (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 turns yellow. when the fully ccw position of lfrq is reached the module works again like a normal quadrature 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 sine vco like a second a-110-4 - but even normal vcos can be used). 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.

the main advantage of the a-110-4 compared to other thru zero vcos is that the design uses a sine/cosine core. the sine/cosine waves are not derived from other waveforms (e.g. sawtooth or triangle) by means of waveshaping. rather the sine and cosine waves are the core of the vco which results in very pure waves with a minimum of distortion and overtones.



important note: please remove the bus jumper (jp3 "bus cv") if no cv transmitter is installed on the same bus (e.g. a midi/usb-to-cv interface a-190-x or a bus access module a-185-x). the a-110-4 applies a small voltage with high impedance (100k) to the cv line of the bus when the bus cv jumper is installed. this may affect other modules that pick-up cv from the bus (e.g. other vcos). as soon as a cv transmitter is installed on the same bus the high impedance voltage of the a-110-4 is overwritten and no problem occurs !

this document explains the functions of the trimming potentiometers. the document is planned only for experienced users ! please do not change the settings of the trimming potentiometers unless you are sure that you want to change certain settings. modules which are returned with (mis-)adjusted trimming potentiometers cannot be treated as case of warranty !

it is also possible to convert the a-110-4 into a thru zero quadrature vclfo by adding two capacitors to the frequency determining capacitors (c1 and c2). for details please refer to this document. a modified version of the module is available upon request (additional charges).



this module has a maximum current draw of 90ma. it requires 8 te/hp worth of space to fit in a eurorack frame.

the amplifier kit:
the circuit increases the output level of the first oscillator version (made before october 2015) from approximately 3 vpp to 10 vpp. more recent modules, including the blue special edition a-110-4se, have an amplifier built-in by default.

there are two ways to check whether the expansion board is suitable for the a-110-4 at hand:
one: at the back of the front panel or on the circuit board of each thru zero quadrature vco is a sticker, informing about the production date. (mmyy – mm = month / yy = year.) if the module was made before october 2015, the upgrade is useful.

two: new versions of the a-110-4 come with an ic named tl082, which is situated right behind the cosinus connector on the circuit board. if such a component is present, the upgrade is unnecessary.

for upgrading an a-110-4 with the amplifier kit, basic soldering skills are required.