Bastl Instruments BUDDY User manual
BUDDY
PREAMP STEREO MIXER
BASTL
INSTRUMENTS
Buddy is a four-channel eurorack stereo mixer optimized for
hybrid setups. Channels A and B are optimized for eurorack
sources (either mono or stereo) with a slight boost (×2 /
+6dB). Channels C and D are line-level pre-amps that can
boost the signal up to ×10 / +20dB and feature stereo TRS
jack inputs for directly connecting desktop units without
further adaptors. All channels feature a clean boost via the
high-quality, low-noise NE5532 op-amp (same as on the
Dude), which delivers smooth overdrive - that can be used
to overdrive clean stereo signals. Several Buddy mixers can
be chained via jumper cables on the back to expand the
number of channels without losing precious inputs.
BUDDY
Setup examples
Use your eurorack as an effects processor! Buddy will
boost your desktop gear to correct levels and be your
perfect aux send mixer.
Use Buddy as a stereo mixdown module for all your
stereo/mono voices.
Use external stereo sound processors with eurorack
voices. Buddy will boost their levels back to modular levels.
Use the Buddy stereo mixdown attenuator to lower the
level for line-level devices.
Technical details
5hp
10pin protected eurorack power connector
depth 30mm (with power cable attached)
current consumption +12V: <27mA, -12V: <27mA
Features
Channels A and B:
— DC coupled
— 100k input impedance
— gain ×2 / +6dB,
— left input normalized to right channel
Channels C and D:
— AC coupled
— 10k input impedance
— gain ×10 / +20dB
— stereo TRS 3.5mm jack input or 2× mono TS 3.5mm
— solder jumpers to convert to DC coupled
— solder jumpers to normalize left input to right channel
Soft Zenner clipping at 10vpp on mixdown stages
NE5532 op-amp for low-noise pre-amp
1k output impedance
Chaining back jumpers L/R inputs and L/R outputs:
Only when Buddy outputs are not patched, the mixdown
is sent to the output chain jumpers (patch configurable
mixdowns).
! POWER !
Before connecting the ribbon cable to this module,
disconnect your system from power! Double-check the
polarity of the ribbon cable and that it is not misaligned
in any direction. The red wire should match the -12V rail,
both on the module and the bus board.
! please make sure of the following
you have a standard pinout eurorack bus board
you have +12V and -12V rails on your bus board
the power rails are not overloaded by current
Although there are protection circuits on this device, we do
not accept any responsibility for damages caused by the
wrong power supply connection. After you’ve connected
everything, double-checked it, and closed your system
(so no power lines can be touched by hand), turn on your
system and test the module.
1 Channel A and B
Channels A and B serve for eurorack sources (mono or
stereo) with a slight boost (×2 / +6dB). They are DC coupled
with 100k input impedance and the left input is normalized
to the right input – if only a mono source is connected,
it should be plugged into the left channel, and a copy of
this mono signal goes to the right channel.
2 Channel C and D
Channels C and D are line-level pre-amps that can boost
the signal up to ×10 / +20dB and feature stereo TRS
jack inputs for direct integration with your desktop units
without further adaptors. They are AC coupled with 10k
input impedancel.
MANUAL
3 Outputs
Left and right mixdown outputs are treated with soft
Zenner clipping at 10vpp in the mixdown stages, and they
have 1k output impedance.
4
Several Buddy units can be chained to obtain more stereo
mixing channels. Use these jumpers to connect to CHAIN_
OUT headers of the previous Buddy in the chain. Match L
labeled and R labeled jumpers on both headers.
5
Use these headers on early Buddy in the chain. Signal will
be sent to these headers only when the outputs are NOT
connected. This setup allows flexible patch configurable
mixdown configurations. Match L labeled and R labeled
jumpers on both headers.
6
Channel C can be configured to have AC input by closing
solder jumpers for both left and right channels.
7
Channel D can be configured to have AC input by closing
solder jumpers for both left and right channels.
8
ThenormalizationschemeofchannelC canbeconvertedto
the same as on channels A or B by cutting the C_ST_NORM
and closing the C_R_NORM solder jumpers.
9
ThenormalizationschemeofchannelD canbeconvertedto
the same as on channels A or B by cutting the D_ST_NORM
and closing the D_R_NORM solder jumpers.
Table of contents
Other Bastl Instruments Music Mixer manuals
