JustBoom Amp HAT

The JustBoom Amp HAT is a high-quality audio amplifier designed specifically for the Raspberry Pi. Digital-to-analog conversion is also included with the Amp HAT, so no external sound cards or DACs are required. 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.

JustBoom designed the Amp HAT to be simple to install and use. With no soldering required and all the mounting hardware already provided, this product is suitable for both beginners and seasoned professionals alike. Just connect your Amp HAT to a set of passive speakers, and you can be up and running quickly, enjoying flawless, high-quality audio playback within minutes. Also included is an optional IR receiver to allow remote control operation of your Raspberry Pi Amplifier.

Featuring a Class-D power amplifier chip with built-in 192kHz/32-bit DAC, for a peak power output of 2 x 55 watts, the JustBoom Amp HAT outputs audio over two speaker cable connector blocks that accept anything up to 14 AWG cable and will provide crystal-clear audio to either 4 or 8 ohm passive speakers. The Amp HAT uses the I2S interface for its audio input, which reduces CPU load on the Raspberry Pi compared with USB solutions. It is also designed to back-power the Raspberry Pi over the 40-pin GPIO header, meaning you only need a single power supply for the entire system.

Note: To power this HAT you will need to pick up the Global Power Supply or possess one capable of powering the HAT.

  • Full high-quality audio — 192kHz / 32-bit
  • 2 x 55 watt peak output at 8 ohms (2 x 30 watt RMS)
  • Includes both a DAC and power amplifier — just connect to your passive speakers
  • Back-powers the Raspberry Pi over the GPIO (with full HAT-compliant protection) at 2.5A, so only one power supply is required for the whole system.
  • Plug-and-play compatibility for ease of use
  • Hardware and software volume control from your Raspberry Pi
  • Onboard hardware jumpers for configuring mute and gain settings (jumpers could optionally be changed with switches)
  • Mute/enable with GPIO22 (this can be overridden by using jumper J4)
  • No soldering required
  • Optional IR receiver included in package
  • Unused GPIO pins still accessible via unpopulated extension header
  • Full driver support in Raspbian / NOOBS
  • Compatible with OSMC / Max2Play /RuneAudio / Volumio / Moode / PiCorePlayer / PiMusicBox / OpenELEC and others

JustBoom Amp HAT Product Help and Resources

Core Skill: DIY

Whether it's for assembling a kit, hacking an enclosure, or creating your own parts; the DIY skill is all about knowing how to use tools and the techniques associated with them.

1 DIY

Skill Level: Noob - Basic assembly is required. You may need to provide your own basic tools like a screwdriver, hammer or scissors. Power tools or custom parts are not required. Instructions will be included and easy to follow. Sewing may be required, but only with included patterns.
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Core Skill: Programming

If a board needs code or communicates somehow, you're going to need to know how to program or interface with it. The programming skill is all about communication and code.

3 Programming

Skill Level: Competent - The toolchain for programming is a bit more complex and will examples may not be explicitly provided for you. You will be required to have a fundamental knowledge of programming and be required to provide your own code. You may need to modify existing libraries or code to work with your specific hardware. Sensor and hardware interfaces will be SPI or I2C.
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Core Skill: Electrical Prototyping

If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.

4 Electrical Prototyping

Skill Level: Experienced - You will need to consult a datasheet for calculations to determine a components output format, linearity, and do a little math to get what you need. You will be using a datasheet or schematic beyond basic pinouts.
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Customer Comments

  • BernieW / last year / 1

    Any plans to carry the various JustBoom cases? If so, is the timeframe known?

  • This is pretty nice. 2x55W isn’t bad. I’m still looking for something that can drive my vehicle’s audio system though.

    • MrMoody / last year / 1

      For car audio I’d just use the DAC HAT and a separate amplifier designed for car audio https://www.sparkfun.com/products/14319

  • VECTARE / last year / 1

    Looks cool, but the in the tradition of Sparkfun, will a schematic be posted?

    • CF / last year / 2

      We don’t actually make this board, (Justboom does) so we don’t have a schematic. You might see if the manufacturer does though.

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