doepfer a-185-2 precision cv adder price : $89.00
a-185-2 precision cv adder: vintage edition price : $99.00

module a-185-2 is a precision control voltage adder/buffer. precision means that the amplification of the inputs without attenuators is exactly 1.00 and is suitable to add control voltages for the pitch control of vcos (e.g. from keyboard + sequencer 1 + sequencer 2).

the module is equipped with four cv inputs: one with attenuator and three without attenuator. each input is normalled to +1.00v (i.e. if no plug is inserted the input contributes 1.00v to the sum appearing at the output). the input with attenuator can be used for common modulations (e.g. from an lfo, adsr, theremin, pitch-bender) for all vcos connected to the output. the inputs without attenuators are planned to add control voltages coming out of keyboards, sequencers, midi-to-cv interfaces, ribbon controllers or other cv sources that follow the 1v/oct standard. for example the cv of a keyboard can be used to transpose the cv coming from a sequencer, or the cv of a slow sequencer can be used to transpose the cv from a fast sequencer.

each input is equipped with a three-position switch that determines if the corresponding voltage is added (right position), subtracted (left position) or if the input has no effect (center position). if no plug is inserted the corresponding switch works as an octave switch as the default 1.00v are added or subtracted to the output voltage according to the switch position.



the module is equipped with 4 outputs: three non-invertíng and one inverting ouput. an internal jumper can be used to connect the non-inverted or inverted output to the cv line of the a-100 bus. that way the module can used to control several vcos that are connected to the same bus board as the a-185-2 (same functionality as a-185-1).

remark for a-185-2 users:
there is a pin header with three pins (labelled jp5) near the bus cable connector. if no jumper is installed there is no connection between the outputs of the a-185-2 and the cv line of the a-100 bus. in the lower position the normal cv output of the a-185-2 is connected to the cv line of the a-100 bus. in the upper position the inverted cv output of the a-185-2 is connected to the cv line of the a-100 bus.

attention:
the module comes with an installed jumper, i.e. one has to remove the jumper if e.g. an a-190 or a-185-1 is already connected to the cv line of the same bus board! if the a-185-2 should be used as cv source for the a-100 bus the cv connection of another cv source (e.g. a-185-1 or a-190) has to be removed. otherwise a short circuit is made between the outputs of the cv transmitters!



this module has a maximum current draw of 10ma. it requires 6 te/hp worth of space to fit in a eurorack frame.