5nm, Class D, DRAGONLOCK, Envelope, I2S, IBM, MacroFab, macrofab engineering podcast, MEP, Podcast, Samsung, Samsung Battery, Synth, TAS5731, TheCurrentSource, WS2812B

MEP EP#71: Wrong Variants

Download: MP3
RSS Feed: Link
Twitter: @MacroFab

Runtime: (43:39)

Parker Dillmann
Stephen Kraig


Podcast Notes

  • Derrick from The Current Source sent in his stomp box as some “reverse” swag.
    • Recommend putting an LED in the Bass’ eyeball for power notification.
  • Parker
    • Finished and ordered the Raspberry Pi Compute Module LVDS test board.
    • Started researching more about I2S Audio.
  • Stephen
    • Synthesizer Update
      • Got the envelope working.
      • Envelope controls the volume and signal amplitude.
      • There was a hardware bug in that the envelope turned on before the frequency changed to the next note.
        • Stephen fixed it in software by adding a small 10ms delay before opening the envelope.
  • Pick Of the Week (POW)
    • Kinda unusual this week but DRAGONLOCK
      • 3D printer files for dungeons and stuff.
    • MonoPrice is having a sale on 3D printers.
  • Rapid Fire Opinion (RFO)
    • Heads up – WS2812B NeoPixels are about to change! – By Particle.io
      • 1. “RGB port refresh rate increased from 400Hz to 2000Hz, there’s LOW Frame Frequency and No Flicker appear in HD Video Camera, it improves excellent Large-Screen display effect.”
      • 2. “RGB port current-output reduced from 17.5mA to 16.5mA, it can’t be recognized by naked eyes and won’t affect the mixed OLDs & NEWs. However, it’s recommended to separate these old & new chips if your demand performance-critical.”
      • 3. “Old & New chips go all the way in PINs, application circuits, operating voltage, and PCB drawings, and the software is also fully compatible.”
      • 4. “Old & New chips are exactly the same as in Timing, Data transmission and Data structure. However, the Reset Time increased from >50us to >280us. It won’t cause wrong reset while interruption, and what’s more, it supports the lower frequency and inexpensive MCU. When the “Reset Time<280us”, don’t mixed up and kindly please make necessary amends.”
    • Samsung to recycle millions of recalled Galaxy Note 7 phones – Electronics Weekly
      • 4 million phones have been recalled.
      • All salvageable components, such as semiconductors and camera modules, shall be detached for test sample production purposes.
      • Samsung also plans to join the EU’s R&D and test efforts to develop new eco-friendly processing methods.
    • IBM unveils world’s first 5nm chip – Ars Technica
      • notable for being one of the first to use horizontal gate-all-around (GAA) transistors, and the first real use of extreme ultraviolet (EUV) lithography.
      • 2D, 3D, and back to 2D
        • First transistors where 2D
        • FinFETs where dev and where 3D
        • GAAFETS are FinFETs set sideways
        • fin is now a silicon nanowire
        • GAAFETs may go all the way down to 3nm, especially when combined with EUV. No one really knows what comes after 3nm.


Are you interested in seeing a blog series for the synth we’re working on? Let us know! 

Figure 1: Derrik's BASS ACKWARDS stompbox he sent in!
Figure 1: Derrik’s BASS ACKWARDS stompbox he sent in!
Figure 2: Parker's Layout for the Raspberry Pi 3 Compute Module LVDS test board.
Figure 2: Parker’s Layout for the Raspberry Pi 3 Compute Module LVDS test board.
Figure 3: Timing diagram and measured waveform of Stephen's Synth envelope problem.
Figure 3: Timing diagram and measured waveform of Stephen’s Synth envelope problem.

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