Community Dice

• Stephen

  • Community Dice
    • Matt Parker – Standup Maths
    • Thingiverse
    • Shapeways
  • What’s the highest frequency signal a home gamer can generate? (square and sin waves?)

• Raspberry Pi Compute Module Motherboard

  • Continuation from the Compute Module board from last year
  • Added the PCM5122 audio DAC
  • Learning about USB HUB design
    • TUSB2046B
    • TPS2044 for overcurrent protection
      • Only rated for 500mA
    • USB spec says only 120uF cap per hub required but 100uF per port is recommended with low ESR
    • USB DM/DP signals require around 227-ohmtermination resistors
    • Optional filter of 22pF recommended for EMI suppression
    • This creates a “low pass” filter with a cut off of 267.9 MHz
      • 12M bit/sec full Speed USB 12MHz, well under this cut off

• Rapid Fire Opinion (R.F.O.)

  • Mouser now Authorized Distributor for Espressif
    • They make the ESP8266 Wifi stuff
    • FPGA Dev boards
      • Arrows $30 FPGA Board
        • Altera MAX 10
        • Built in USB programming
      • TinyFPGA Lattice
        • $12  but requires a $9 programmer

• MacroFab is Hiring!

  • See open positions

Visit our Slack Channel and join the conversation in between episodes!

If you have a cool idea, project or topic that you want Stephen and me to discuss, tweet at us @MacroFab or email us.

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Hosts: Parker Dillmann, Stephen Kraig

Special thanks to whixr over at Tymkrs for the intro and outro!