Project:Festival Radio

ProjectInfoBox Festival Radio
Status:	figuring out which parts to buy
Release Date:	hopefully June 2019
Initiator:	Lukas
Team:	who else would like to help?

I want to turn an old radio into a digital music player for festivals and garden parties.

Originally I wanted to keep the old radio functions in, but will probably scrap that plan to gain more space for batteries and ease of assembly.

If you're good with audio, electronics or Raspberry Pi, I'd apreciate any help!

Important Steps

• remove unneeded hardware
• add batteries & charging electronics
• get basic functionality (e.g. 3.5 mm jack)
• convert the cassette tray into an SD card reader
• (optional) display ID3 information about current song somewhere (old tuner scale?)

Shopping List

• Pi 3B+
• amplifier board & digital-analog converter: X400 HAT V3.0
• alternative board & DAC JustBoom Amp
• power supply:
  • Amp: will work fine with 12 V -> the batteries should be selected accordingly!
  • Pi: 5 V (output included in the HAT)
  • charger: 4S 14.4V (16.8V max)?
• batteries: 3S or 4S lithium pack(s)
  • 18650 holders from Patrick
  • protection/balancing/charging circuit: ___?
    • protection board 4S
    • smaller 4S protection/balancing board
    • charger for 4S battery
• Tuner & Aux In
  • would need an ADC to be able to sample the audio signals and output them on the amplifier board
  • alternative: an extra AUX amplifier board and switch inputs (e.g. [1])

Starting Points

• patrickweber.info (DE)
• Martin's music box