JustBoom Digi HAT for the Raspberry Pi
The JustBoom Digi HAT is a high-resolution digital audio output add-on board for the Raspberry Pi.
Simply stack the plug-and-play add-on board (HAT) onto your Raspberry Pi A+, B+, 2B or the new 3B
and it will be ready to use immediately. The JustBoom Digi HAT produces an unmodified, high
quality, digital audio data stream for bit-perfect transmission to your HiFi system.
SKU: JBM-002
Description
The JustBoom Digi HAT is a high resolution digital audio output add on board for the Raspberry Pi.
Simply stack the plug-and-play add on board (HAT) onto your Raspberry Pi A+, B+, 2B or the new 3B
and it will be ready to use immediately. The JustBoom Digi HAT produces an unmodified, high
quality, digital audio data stream for bit-perfect transmission to your hifi system.
We’ve designed the JustBoom Digi HAT to be simple to install and use. With no soldering required
and all the mounting hardware already provided this product is suitable for absolute beginners and
seasoned professionals alike. Just connect your Digi HAT toexternal DAC or amplifier/amplified
speakers and you can be up and running quickly, enjoying flawless high quality audio playback
within minutes of setting up this Raspberry Pi HAT. We also include an optional IR receiver to allow
remote control operation of yourRaspberry Pi.
The JustBoom Digi HAT Includes a 192kHz/24 bit digital audio chip with low jitter, bit perfect digital
output (S/PDIF) over optical or coaxial connectors for an uncompromised high quality audio
experience. The JustBoom Digi HAT includes an output transformer for full galvanic isolation
between your Raspberry Pi and yourDAC on the coaxial output.
The HAT uses the I2S interface for its audio input which reduces CPU load on the Raspberry Pi
compared to USB solutions. It is also powered directly from the GPIO header so no extra cables or
power supplies are required to connect to the Raspberry Pi. All of the Raspberry Pi GPIO pins are still
accessible on the Digi HAT for easy customisation of your project – add additional sensors, buttons,
LEDs, rotary encoders or anything your heart desires.
Need help understanding how this product works? Follow our product guide.
Setup Guide
Follow our full setup guide for assembling your JustBoom Digi HAT and Case.
Configure the JustBoom Player software.
Use cases
Pairing the Raspberry Pi with a high-quality digital audio add-on board provides the perfect solution
for a number of exciting projects and applications where the standard onboard audio on the
Raspberry Pi simply won’t cut it. Here are some possible use cases for the JustBoom Raspberry Pi
Digi HAT and your Raspberry Pi computer:
Circumstances where you need to have your streaming audio player (Raspberry Pi in this case)
located separately from your amplifier or DAC. This method is usually superior to analog since the
original digital signal is maintained until the amplification step (theoretically leading to less
degradation of the sound).
Streaming (either from cloud or local network) high-definition audio player
Multi-room audio player
Surround sound for media centre / set-top box applications
And many many more….
Features
Dedicated S/PDIF output interface chip supports up to 192kHz / 24bit resolution
Digital audio output over either optical (TOSLINK) or coaxial (RCA electrical) connectors
Low jitter, bit perfect digital output
Output transformer for galvanic isolation
Plug and play compatibility for ease of use
Software volume control from your Raspberry Pi
No soldering required
Powered by the Raspberry Pi GPIO header
Compatible with Raspberry Pi A+,B+, 2B and the new 3B (and also compatible with the Raspberry Pi
Zero, but we would recommend the JustBoom Digi Zero for this purpose)
Mounting hardware included
Optional IR receiver included in package
All Raspberry Pi GPIO pins still accessible via 40pin unpopulated extension header
Fully HAT compliant
Full driver support in Raspbian / NOOBS
Compatible with JustBoom Player / OSMC / RuneAudio / Volumio / Moode / PiCorePlayer /
PiMusicBox / OpenELEC and others
JustBoom Player pre-configured software available on SD cards from various vendors
Technical Information
WM8804GEDS S/PDIF Transceiver with 24bit/192khz and has an integrated low jitter PLL (50ps RMS)
DA101JC high bandwidth digital output transformer for galvanic isolation on electrical (coaxial/RCA)
output
Integrated EEPROM for automatic Raspberry Pi devicetree driver configuration and fully HAT
compatible
Digital signal output over S/PDIF with either optical (TOSLINK) or coaxial (RCA) connectors
We recommend that if you are using the coaxial/RCA output that you connect the cable shield to the
ground on the DAC / amplifier you are using and make sure that the DAC / Amplifier is using a
power supply with the ground pin connected. This will help to reduce noise.
Bit perfect digital audio transmission
Optional Vishay TSOP4838 IR receiver included in package (solder yourself if required), Also possible
to use Vishay TSOP4938 or TSOP4138 or TSOP34338SS1F
While the hardware is able to output DTS/Dolby Digital, the Raspberry Pi software is not currently
able to support this. Let us know if you want to implement this and we will do our best to help
Additional information
WEIGHT
0.065 kg
DIMENSIONS
13 x 7.5 x 2.5 cm
JustBoom Digi HAT Case
WEIGHT
0.082 kg
DIMENSIONS
8.9 x 6.2 x 4 cm
COLOUR
Red, Black
Official Raspberry Pi Power Supply ‐ 2.5A International Power Supply Unit
WEIGHT
0.195 kg
DIMENSIONS
10.5 x 8.5 x 6 cm
COLOUR
White, Black
https://www.pi‐supply.com/product/justboom‐digi‐hat/ 1‐19‐18
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