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Home > The Amp Hour Electronics Podcast > #474 – An Interview with Nash Reilly
Podcast: The Amp Hour Electronics Podcast
Episode:

#474 – An Interview with Nash Reilly
Category: Science & Medicine
Duration: 01:33:29
Publish Date: 2020-01-12 22:14:21
Description:

 

Welcome, Nash Reilly of Sonos!

  • Chris and Nash met at OSHWA 2018
  • Nash is from Montana and went to engineering school at Montana State University.
  • His first job out of school was at Micron over in Boise, doing SO DIMM testing for large scale customers.
  • He actually tested for things like Cosmic Ray strikes, discussed many times on this show.
  • Interned at Sonos when it was 100 people
  • Watching how the vendors change their tune as you get volume up
  • His role at Sonos started in sustaining engineering
  • Making sure supply chain is stable
  • Spent 4-5 weeks per year in China, even had to leave vacation to fly to China.
  • “Type 2 fun”
  • Smoke jumpers for Intel
  • Hank Zumbahlen episode
  • Staying well grounded
  • Lee Hill’s Silent Solutions
  • I2S clocks hurt emissions, are often a problem during testing.
  • Blog post about emissions
  • Solutions for I2S clocks
    • Changing the output impedance of your driver
    • Put a small external RC filter
  • Howard Johnson on the podcast
  • First 20 pages of the Black Magic book
  • Most DACs/ADCs aren’t as finicky as they used to be
  • I2S is just SPI in one direction
  • Sigma Delta DACs
  • Oversampling and modulating in the reverse direction
  • THD is like a noise measure, but also has distortion
  • Audio Precision test equipment
  • Analog Dialogue
  • Charty Party
  • 30 ms for it to be instantaneous to a human
  • Humans are more sensitive to phase delta
  • Latency is constant for digital signals
  • 3rd edition of AoE
  • ADI AN-283
  • The Way Things Work
  • How do you maintain quality over low quality speakers that are out there?
  • Clicks and pops
  • “A class D amplifier is just a motor driver with an LC on the output”
  • Layout starts to impact things
  • Chapter 8 of AoE for low noise design
  • Sonos Port
  • 20 people in his group, including digital, analog, layout
  • Current project has 10 people in total or so
  • 1600 total people working at Sonos
  • Sonos Amp
  • Had to do a custom class D amplifier
  • Needed to design in real time control
  • Sonos use Linux computers internally for the high level control
  • Microcontrollers for controlling other elements of the design faster
  • Nash is in charge of making sure the digital section is put together well and writing test plans
  • An example schedule: December start (talking with vendors), April schematic, June testing
  • For the Sonos Move, Nash worked on an earlier incarnation.
  • Nash’s main site/blog
  • Find him on reddit
  • Nash is @cushychicken
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