Intellijel Buff Mult 1U User manual

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Buff Mult 1U Manual
Buff Mult 1U
Dual 1 x 4 Buffered Mult
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Manual Revision: 2018.09.13 
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Buff Mult 1U Manual
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Compliance
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This device complies with Part 15 of the FCC Rules. Operation is subject to the
following two conditions: (1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that
may cause undesired operation.
Changes or modifications not expressly approved by Intellijel Designs, Inc. could
void the user’s authority to operate the equipment.
Any digital equipment has been tested and found to comply with the limits for a
Class A digital device, pursuant to part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference when the
equipment is operated in a commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to radio
communications.
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This device meets the requirements of the following standards and directives:
EMC: 2014/30/EU
EN55032:2015 ; EN55103-2:2009 (EN55024) ; EN61000-3-2 ; EN61000-3-3
Low Voltage: 2014/35/EU
EN 60065:2002+A1:2006+A11:2008+A2:2010+A12:2011
RoHS2: 2011/65/EU
WEEE: 2012/19/EU
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Buff Mult 1U Manual
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Installation
This module is designed for use within an
Intellijel-standard 1U row, such as
contained within the Intellijel 4U and 7U
Eurorack cases. Intellijel’s 1U specification
is derived from the Eurorack mechanical
specification set by Doepfer that is
designed to support the use of lipped rails
within industry standard rack heights.
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Before Your Start
Intellijel Eurorack modules are designed to be used with a Eurorack-compatible case and power
supply. We recommend you use Intellijel cases and power supplies.
Before installing a new module in your case, you must ensure your power supply has a free
power header and sufficient available capacity to power the module:
● Sum up the specified +12V current draw for all modules, including the new one. Do the
same for the -12 V and +5V current draw. The current draw will be specified in the
manufacturer's technical specifications for each module.
● Compare each of the sums to specifications for your case’s power supply.
● Only proceed with installation if none of the values exceeds the power supply’s
specifications. Otherwise you must remove modules to free up capacity or upgrade your
power supply.
You will also need to ensure your case has enough free space (hp) to fit the new module. To
prevent screws or other debris from falling into the case and shorting any electrical contacts, not
leave gaps between adjacent modules, and cover all unused areas with blank panels. Similarly,
do not use open frames or any other enclosure that exposes the backside of any module or the
power distribution board.
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Buff Mult 1U Manual
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You can use a tool like ModularGrid to assist in your planning. Failure to adequately power your
modules may result in damage to your modules or power supply. If you are unsure, please
contact us before proceeding.
Installing Your Module
When installing or removing a module from
your case always turn off the power to the
case and disconnect the power cable. Failure
to do so may result in serious injury or
equipment damage.
Ensure the 10-pin connector on the power
cable is connected correctly to the module
before proceeding. The red stripe on the
cable must line up with the -12V pins on the
module’s power connector. The pins are
indicated with the label -12V, a white stripe
next to the connector, the words “red stripe”,
or some combination of those indicators.
Most modules will come with the cable
already connected but it is good to double
check the orientation. Be aware that some modules may have headers that serve other
purposes so ensure the cable is connected to the right one.
The other end of the cable, with a 16-pin
connector, connects to the power bus
board of your Eurorack case. Ensure the
red stripe on the cable lines up with the
-12V pins on the bus board. On Intellijel
power supplies the pins are labelled with
the label “-12V” and a thick white stripe:
If you are using another manufacturer’s
power supply, check their documentation
for instructions.
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Once connected, the cabling between the module and power supply should resemble the
picture below:
Before reconnecting power and
turning on your modular
system, double check that the
ribbon cable is fully seated on
both ends and that all the pins
are correctly aligned. If the pins
are misaligned in any direction
or the ribbon is backwards you
can cause damage to your
module, power supply, or other
modules.
After you have confirmed all the
connections, you can reconnect
the power cable and turn on
your modular system. You should immediately check that all your modules have powered on
and are functioning correctly. If you notice any anomalies, turn your system off right away and
check your cabling again for mistakes. 
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Buff Mult 1U Manual
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Operation
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Buff Mult 1U is a dual 1 x 4 buffered signal multiplier. A signal multiplier takes an input signal
and routes it to multiple outputs simultaneously. For example, you might want to route
keyboard’s pitch CV to three different destinations: one to govern the pitch of your main
oscillator; another to govern the pitch of a second oscillator; and the third to open and close a
filter so that it tracks across the keyboard.
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Unlike a passive mult, which merely splits the incoming signal and shares it across multiple
outputs (much like a Y-cable), buffered mults make electrical copies of an input voltage and
duplicate that voltage at the outputs.
Buffered mults have a few advantages over passive mults. Because buffered mults isolate their
outputs from the input, any faults or shorts present at the input will not pass through to a
connected module. Also, in a passive mult, what you connect to an output can cause a slight
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Buff Mult 1U Manual
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variation in the voltages that it sends. In some situations (like an LFO or envelope), this probably
won’t have any sonic effect on your patch. But for voltage-critical functions (like an oscillator,
where only a slight change in voltage is easily heard), it’s often better to use a buffered mult,
since this insures that the 1V/Oct signal arriving at its input will be electrically and accurately
duplicated across all its outputs.
Buff Mult 1U is divided into two sections — upper and lower. Each section is its own
1INx4OUT buffered multiplier. Plug an audio or CV signal into the upper section’s left-most
jack [1] and Buff Mult sends a buffered duplicate of that signal out the other four jacks [2] in the
group. Similarly, an audio or CV signal patched into the bottom section’s left-most jack [3] is
duplicated at the other three jacks [4] in the group.
The top input jack [1] is normalled to the bottom input jack [3]. So if nothing is plugged into the
bottom input [3], then the top input [1] is duplicated across all 8 outputs, making Buff Mult act as
a single 1 x 8 buffered signal multiplier.
Technical Specifications
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Width
14 hp
Maximum Depth
29 mm
Current Draw
4 mA @ +12V
4 mA @ -12V
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