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Laka Sequential Voltage Processor + Mixer User’s Manual for Eurorack
Copyright 2022 SetonixSynth. All rights reserved.
Revision May 2022
Hello and thank you for using the Laka Sequential Voltage Processor + Mixer for Eurorack modular. We
hope you will find it to be useful and fun!
Technical Specifications (Eurorack standard)
Width: 16hp
Depth: 28mm
Peak Current Draw: 65mA @ +12V, 65mA @ -12V
Input Impedance (Channels A-D, Calibrated): 97k approx. per input
Input Impedance (Clock): 100kΩ
Input Impedance (Reset): 47kΩ
Output Impedance (All Outputs): 1kΩ
Output voltage range (All Outputs): +/-11.5V (23Vp-p) approx.
Clock Threshold: ↑ +5V (Advances on rising edge)
Reset Logic Threshold: +5V
1. Connecting your Laka
Connect a power cable to the pin header at the top of the Laka pcb. The -12V side of the connector
should be facing downwards, and must be aligned with the silkscreen stripe indicator for proper use. This
module is reverse diode protected, but we do not recommend that you plug it in backwards to see what
happens.
CAUTION: Laka uses so-called “rail-to-rail” op-amps to process and mix signals. This means that it is
capable of handling voltage inputs equal to the swing of its power rails and outputting voltages at a
potential amplitude of approximately +/-11.5V peak to peak on a typical Eurorack power supply. This is a
very wide range! Signals of this amplitude will not damage Laka, but they may cause overdriving, strange
behavior, or damage in other circuits not designed to handle such a wide voltage swing, particularly
synths or devices powered by lower voltages. When in doubt, the amplitude of any Channel may easily be
reduced by moving the corresponding fader closer to the middle position and removing the voltage offset.
2. Theory of Operation
Laka is designed to be a powerful multi-functional hub for routing voltages within a modular system of any
size. It uses precision resistors, modern low-noise/rail-to-rail op-amps and switch IC, and audio-grade
hardware to function as a true voltage “Swiss Army knife,” equally at home routing audio or control
signals.
We drew inspiration for Laka’s design from the classic console audio mixer, which has been used
extensively by thousands of illustrious musicians and producers and accepted as an instrument in itself
for decades. The Eurorack modular format has incorporated this as well, with many users benefiting from
a powerful in-rack audio mixer with faders, mutes, aux sends, sub-mixes etc.
We felt that Control Voltage could benefit from the same treatment, and thus Laka was born. The large
attenuverting faders make it easy to dial in precise voltage amounts, and then, crucially, add or subtract
offset voltage if desired to bring each output within the desired window for use. This has been a classic
synthesizer function for decades, but Laka offers several improvements: high headroom, low noise,
modern low-noise/low-offset op-amps, and most importantly: simultaneous access to all its features at
once. No Easter eggs, no hidden modes: Laka’s power comes from its incredible potential for combining,
feedback-ing, processing, and re-processing, underpinned by immediate and inspiring tactile and visual
feedback. This is a processor built to match and complement the many amazing voltage sources of
modern Eurorack modular, with a generous helping of fun and style!
3. Summary of Functions
Laka signal flow diagram.
Voltage Processor section:
A, B, C, D (Upper): DC Coupled voltage inputs. Accepts input signals of up to approx. +/-11.5V and
routes them to the four Voltage Processor channels.
-Normalization of inputs: The four inputs are normalized from left to right in the manner indicated
by the front panel arrows, so that with nothing plugged into Jack D it will engage with the voltage
input present at Jack C, which will engage with Jack B when unplugged, which will in turn engage
with Jack A. As such, for example, a signal patched to Jack A will be routed to Inputs B, C, and D
if nothing is inserted into any other Input.
-With nothing patched to Jack A, its input is normalized to +5V via a protective 1k seriesΩ
resistor, so the faders of unpatched/unused channels following the normalization scheme may be
used to manipulate a voltage offset. Note that every channel with the fader engaged for use as a
voltage offset will load our “virtual” +5V reference and cause a slight drop in the faders’ actual

Produktspecifikationer

Varumärke: SetonixSynth
Kategori: Inte kategoriserad
Modell: Laka

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