samara - Xaoc Devices

samara - Xaoc Devices
SAMARA
utility
waveform
processor
operator’s manual rev. 1962/1.0
Model of 1962
module
explained
SALUT
ATTENUATION, INVERTING & OFFSET
Looking at the front panel layout (fig.1), There
are four identical channels. Each channel features
a regular in input 1 as well as an inverting inv
input 2 . The difference between these inputs is
adjusted by an active attenuator. Each unused input is normalized to 0V, hence this arrangement
allows for two independent channels of normal
attenuation, or inverting attenuation, or computing a difference between two voltages or signals.
Thank you for purchasing this Xaoc Devices product. Samara is a "Swiss Army Knife" type of module, intended to serve the most common voltage
and audio signal processing purposes such as attenuation, offsetting, mixing, inverting, and even
basic waveshaping. We have designed it to complement the ever-popular Batumi module but it
will happily serve all these functions on its own.
INSTALLATION
Additionally, two sources of a stable +5V
voltage are switchable in channels 1 and 3,
activated by pressing the corresponding illuminated button 3 . This offset is added to the
inputs before attenuation. Thus, if nothing is
patched to the inputs of channels 1 and/or
3, they can be used as a source of constant
voltage, from 0 to 5V. The resulting signal or
voltage, after being manually attenuated by
the level/ofst knob 5 , is available on the
corresponding out outputs 6 .
The module requires 10hp worth of free space
in the eurorack cabinet. The ribbon type power
cable must be plugged into the bus board, paying close attention to polarity orientation. The
red stripe indicates the negative 12V rail and is
supposed to point in the same direction on both
the bus board and the unit. The module itself is
secured against reversed power connection,
however reversing the 16-pin header may cause
serious damage to other components of your
system, because it will short-circuit the +12V
and +5V power rails. The module should be fastened by mounting the supplied screws before
powering up. To better understand the device,
we strongly advise the user to read through the
entire manual before using the module.
To achieve independent control over scale and
offset two channels must be utilized: one for
offset (with the 5V offset toggle engaged
and nothing patched into the inputs) and another one for scaling.
A bi-color LED 7 indicates the value and polarity of the voltage through corresponding brightness and color. For audio signals, fast blinking of
red and green yields a yellow-orange mixture
with intensity corresponding to signal level.
BASIC FEATURES
Samara features four channels—each with two
inputs and an attenuator, additional switchable
offset generators, four voltage level and polarity
indicators, two adders with switchable scale,
and a precision four-channel processor that selects minimum and maximum voltage. See the
block diagram (fig. 4) on page 5.
Note that you may use the individual outputs
to re-direct the processed channels to other
channels. For example, an attenuated signal or
2
front panel
overview
fig. 1
3
4
5
4
7
1
2
6
9
8
10
11
3
CV from channel 2 can be patched to channel 3
with offset turned on. Changing the attenuator
in channel 2 will not affect the offset. Also, an
offset from channel 1 or 3 can be patched to an
inverting input of channel 2 or 4, thus a negative offset can be easily achieved.
plugged into 1+2 output socket 9 ). Additionally, you can use the inverting inputs 2 to mix up
to eight signals.
To use Samara as two independent 2:1 mixers,
use both 1+2 9 and 3+4 8 output. Patching a
cable to 1+2 output breaks the internal connection, and these two channels are no longer mixed
with channels 3 and 4. Again, using the inverting
inputs allows for two four-component mixes.
MIXING
A cascaded arrangement of summers allows for
the mixture of all channels with the ability to
break the sum into two sub-mixes. To mix four
signals, feed them into inputs 1 and adjust the
level knobs 4 . The resulting signal is available
at the all socket 8 (make sure that nothing is
Since mixing multiple hot signals with little attenuation usually yields overdrive (especially
at the ALL output 8 ), a soft-clipping solution
is offered. It can be turned off by removing the
jumper at the batck of the PCB. Additionally,
optional -6dB (2:1) attenuation is available independently for 1+2 and 3+4 summers by using
two jumpers on the back of the module. Switching just one jumper does not affect the amplitude of the second summer. Note that the all
mix will have unequal proportions in such case.
Also, note that the jumpers do not affect the operation of the min and max outputs (see below).
dB
4
MAX
2
0
-2
MIN
fig. 2
-4
0
Hz
2
4
6
8
MINIMUM & MAXIMUM OUTS
10
In addition to linear mixing, Samara features a
precision min/max computing circuit that outputs the current minimum voltage of all the (attenuated) channels at the min 10 output, as well
as the maximum voltage at the max 11 output.
output. See fig. 2 & 3 for examples.
dB
4
MAX
2
0
MIN
This circuit is intended for processing control
voltages, such as LFO waveforms, envelopes,
etc. However, it does provide interesting results with audio signals when used as a flexible
-2
fig. 3
-4
0
Hz
2
4
6
8
10
4
block
diagram
fig. 4
inputs
inputs
fixed offset
ATTENUATION
ATTENUATION
1
3
ANALYSIS
ind. output
ind. output
inputs
inputs
ATTENUATION
ATTENUATION
2
sub mix / all mix
4
sub mix
ind. output
ind. output
waveshaper. For example, by processing just a
single waveform in one channel, it is compared
to 0V from the remaining channels, hence a
half-wave rectified version is available at the
max output and the negative halves are available at the min output. Also, by patching the
max or min output back to any of the inputs
allows one to independently scale the upper or
the lower half of the waveform by using the corresponding attenuators. A full-wave rectified
waveform can be produced by patching back
the min output to the inverting input of another channel. Furthermore, by feeding a constant
CV to all remaining channels, the splicing point
of the waveform can be altered. Be aware that
channels without an input signal (or channels
attenuated to 0) will be treated as 0V, which affects the operation of min and max. If you don’t
want that, simply feed unused channels with a
copy of signals from active channels. •
5
main
features
WARRANTY TERMS
XAOC DEVICES WARRANTS THIS PRODUCT TO BE FREE OF DEFECTS IN MATERIALS OR WORKMANSHIP,
AND TO CONFORM WITH THE SPECIFICATIONS AT THE TIME OF SHIPMENT FOR A PERIOD OF ONE YEAR
FROM THE DATE OF PURCHASE. DURING THAT PERIOD ANY MALFUNCTIONING OR DAMAGED UNITS
WILL BE REPAIRED, SERVICED, AND CALIBRATED ON A RETURN-TO-FACTORY BASIS. THIS WARRANTY
DOES NOT COVER ANY PROBLEMS RESULTING FROM DAMAGES DURING SHIPPING, INCORRECT INSTALLATION OR POWER SUPPLY, IMPROPER WORKING ENVIRONMENT, ABUSIVE TREATMENT OR ANY OTHER
OBVIOUS USER-INFLICTED FAULT.
Four attenuation
channels
LEGACY SUPPORT
One four-channel
mixer
IF SOMETHING WENT WRONG WITH A XAOC PRODUCT AFTER THE WARRANTY PERIOD IS OVER, NO
NEED TO WORRY, AS WE’RE STILL HAPPY TO HELP! THIS APPLIES TO ANY DEVICE, WHEREVER AND
WHENEVER ORIGINALLY ACQUIRED. HOWEVER, IN SPECIFIC CASES, WE RESERVE THE RIGHT TO CHARGE
FOR LABOR, PARTS AND TRANSIT EXPENSES WHERE APPLICABLE.
RETURN POLICY
THE DEVICE INTENDED FOR REPAIR OR REPLACEMENT UNDER WARRANTY NEEDS TO BE SHIPPED IN
THE ORIGINAL PACKAGING ONLY, SO PLEASE KEEP IT JUST IN CASE. XAOC DEVICES CAN NOT TAKE
ANY RESPONSIBILITY FOR DAMAGES CAUSED DURING TRANSPORT. PRIOR TO SENDING US ANYTHING,
PLEASE CONTACT US AT SUPPORT@XAOCDEVICES.COM. NOTE THAT ANY UNSOLICITED PARCEL WILL BE REJECTED AND RETURNED!
GENERAL INQUIRIES
FOR USER FEEDBACK SUGGESTIONS, DISTRIBUTION TERMS, JOB POSITIONS FEEL FREE TO CONTACT
XAOC DEVICES AT INFO@XAOCDEVICES.COM. PLEASE VISIT THE XAOCDEVICES.COM FOR INFORMATION ABOUT THE CURRENT PRODUCT LINE, USER MANUALS, FIRMWARE UPDATES, TUTORIALS,
AND MERCHANDISE.
Two offset
channels
Four inverters
Two doublechannel mixers
Mixing of up to
eight signals
when using
inverted inputs
Minimum/
maximum
selection circuit
Basic
waveshaping
technical
details
EASTERN BLOC TECHNOLOGIES
MADE IN THE EUROPEAN UNION
Eurorack synth
compatible
10hp, skiff
friendly
ALL RIGHTS RESERVED. CONTENT COPYRIGHT © 2016 XAOC DEVICES. COPYING, DISTRIBUTION OR
ANY COMMERCIAL USE IN ANY WAY IS STRICTLY PROHIBITED AND REQUIRES THE WRITTEN PERMISSION BY XAOC DEVICES. SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT PRIOR NOTICE.
Current draw:
+25mA/-20mA
Reverse power
protection
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertising