Tube audio escape

R-Pi with digital audio hat into tube amplifier.

This example creates a low-cost audiophile-grade audio player with tube amplification for headphones or powered speakers.



Hardware shown

  • Tablet Frame Kit for Raspberry Pi and Arduino, Model SA8, by Novel Design Lab

  • Samsung A8 tablet (2018)

  • Raspberry Pi 3

  • Power supply for R-Pi: use charger from Samsung tablet. USB-C to micro B male adapter required, except if using Raspberry Pi 4.

  • HiFiBerry DAC+ with RCA output

  • Bravo Audio V2 Class A 12AU7 Tube Multi-Hybrid Headphone Amplifier

  • Mounting bracket for Bravo Audio amp, by Novel Design Lab (DIY 3D print file here)

  • Power supply for Bravo amp: 12V 5A 60W AC DC Power Supply Adapter

  • Miscellaneous items: microSD card, USB flash drive (for high-def audio files), RCA cables, headphones

Software

Installed on Raspberry Pi:

  • Volumio (Raspberry Pi version) https://volumio.org/get-started/

  • Set up: the typical Volumio set-up is internet-connected via LAN for media streaming or access to shared storage. This project example uses Volumio in stand-alone configuration with the tablet connected to a WiFi access point created by the Volumio software installed on the R-Pi. When the R-Pi is powered-up, it'll present the WiFi network "Volumio". Set the tablet's WiFi connection to this network and use the network browser app (e.g. Chrome or other browser typically pre-installed on your tablet) to connect to IP address 192.168.211.1 (assigned to the R-Pi by Volumio). The Volumio login password is "volumio2". For more information, see the Volumio installation instructions https://volumio.github.io/docs/FAQs/Installation.html

Installed on tablet:

  • Network browser app pre-installed on tablet (e.g. Chrome, etc.)

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