Dion Audio LOCO-V2 User manual

LOCO-V2 DAC-AMP
The LOCO-V2 DAC-AMP is a HAT board for the Raspberry Pi 2/3 model . It provide a high
resolution DA converter and a class D power amplifier. Together with a Raspberry Pi it is your
complete solution for a media player or music streamer with outstanding sound quality. All you
need is to connect a power supply and to wire up your loudspeakers!
Specifications:
•HAT board, compatible with Raspberry Pi 2/3 model .
•No need to install drivers, the Raspberry Pi will detect the LOCO automatically.
•i2s audio from the Raspberry Pi up 32 bit/ 384 kHz.
•it perfect DA converter up to 32 it/384 kHz.
•Hardware volume control via ALSA, so there is no loss in bit-depth.
•Fully symmetrical signal path for low distortion.
•<0,005% THD+N at 1 watt/4 ohm.
•SNR (A Weighted) >111 d (LS output).
•DC Power supply from 19 V to 35 V.
•ack power up to 3 A for the Raspberry Pi.
•Up to 153 Watt/4 ohm.
•Fully protected against faults with short-circuit protection, and thermal protection as
well as over-voltage, under-voltage, and DC protection.
•High quality components like low ESR capacitors, fully shielded coils and low noise
regulators.
•Fully tested for functions and reliability.
•Designed and hand assembled in the Netherlands.

Attaching the LOCO-V2 to the Raspberry Pi
The LOCO-V2 comes with standard accessories to mount it to the Raspberry Pi.
•LOCO with gold plated 40 pin header.
•4x nylon m2,5 female – female spacer 18 mm.
•4x nylon m2,5 male – female spacer 10 mm.
•8x m2,5 screws.
•5.5mm /2.1mm DC adapter plug
The full range of Dion Audio LOCO-V2 accessories are available directly from our website:
www.dionaudio.nl
The following pictures shows how to mount the LOCO-V2 to the Raspberry Pi.
Connecting The loudspeakers
The LOCO-V2 is able to delivers up to 153 Watt at 4 ohm per channel, and the power amplifier
is protected against faults with short-circuit protection, thermal protection, as well as over-
voltage, under-voltage, and DC protection. However be careful when connecting the wires.
Avoid short-circuiting the loudspeaker outputs because it can result in COMPLETELY DAMAGING
THE LOCO-V2.

Connecting the power-supply
The LOCO-V2 powers up the Raspberry Pi, so DO NOT power the Raspberry Pi via the 5 volts
US supply as well.
We recommend to use a power-supply of 24 volts at 120VA. It is the right balance between
output power, back power for the Raspberry Pi and safety. See the list for more power options.
•Use minimal 19 volts at 90VA, the output power will be 45 Watt at 4 ohm.
•Use 24 volts at 120 VA, the output power will be 72 Watt at 4 ohm.
•Use 32 Volts at 200 VA, the output power will be 128 Watt at 4 ohm.
•Use maximal 35 Volts at 300 VA to run the LOCO at its maximum output power. The
output power will be 153 Watt at 4 ohm.
When using the DC adapter plug, connect the red wire to the + (right site), and the black wire
to the – (left site) of the terminal block J3. When connecting the power-supply directly to the
LOCO-V2, make sure that the + is connected to the right site, and the – is connected to the
left site of the terminal block J3. WIRING THE POWER-SUPPLY THE WRONG WAY CAN DAMAGE
THE LOCO-V2 AND THE POWERSUPPLY, so take precautions.
Powering up the LOCO-V2
If the loudspeakers and the power-supply is connected correctly than it is time to power up the
LOCO-V2. When the LOCO-V2 is powered up, the blue LED D1 will light up. If D1 will not light
up, disconnect the power supply directly and double check the wires and connections. If the
blue LED does light up, than the LOCO-V2 will work correctly.
And play!
One important step to take is to TURN DOWN THE VOLUME before first use!
List of software that include the LOCO-V2 drivers in the kernel
These distributors will auto-detect the LOCO-V2 for plug and play use, and there are more to
come.
•Raspbian https://www.raspberrypi.org/
•OSMC https://osmc.tv/
•LibreELEC https://libreelec.tv/
•OpenELEC http://openelec.tv/
•Moode http://moodeaudio.org/
•piCorePlayer https://sites.google.com/site/picoreplayer/home
•Roon https://roonlabs.com/
•RetroPie https://retropie.org.uk/
•Xbian http://www.xbian.org/
•Volumio https://volumio.org/

Test procedure
efore a LOCO-V2 board is sold, it is tested on functionality and reliability. The LOCO-V2 is
connected to a 24 V/120 VA power-supply, and the output power is measured by loading the
LOCO-V2 with a white noise signal at 10 watts for 1 hour, and at 72 watts for ten minutes. If
the LOCO-V2 passes these tests, all voltages are being measured at the regulators, at the
filters, and at the capacitors. The output signal is being tested on noise and distortion. As
finishing touch, music is played through the LOCO-V2 for one hour.
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