Void copper donuts

Circuit Break Podcast #155

Void Copper Donuts

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January 16, 2019, Episode #155

Parker wraps up his Wagon Chime Module and looks at USB Power Switches and Stephen covers his EQ build.
  • Parker
    • Wagon Chime Module Repaired
    • StarWars Detonator Prop
    • RPI3 CM Motherboard USB Hub Saga
      • LAN9514
        • Page 14/15 of the datasheet
        • PRTCTL or Port Control
        • Single I/O that operates as a input and output
        • It operates as an open drain with an internal pullup
        • When the USB Power Switch senses an overcurrent it needs to drives the PRTCTL pin low
        • Then the LAN9514 also drives the pin low
        • This PRTCTL needs to operate the enable pin on the USB Power Switch
        • MP62551 or TPS2054B
        • Would need 4 MP62551 but I can provide 2A total verse 500mA
        • Operates the way the PRTCTL needs
        • Possibly breaking this HUB circuit into its own to prototype?
    • Improving the Prop Dev Stick
      • Changing to QFN from QFP Prop
      • 0402 parts instead of 0603
      • USB Type C for USB 2.0
      • Changing the power handling?
        • Original part is TPS2113
        • Only handles 5.5V MAX
        • NCP3901 is a Dual input Mux
        • Handles more power then I need but no built in current limiting
        • Maybe MPS has a good standalone current limiter?
  • Stephen
    • Beginning the eq build. There is a lot to do so it is taking a bit of time
    • Gold fingers and connectors – They work!
    • Trying a special coax connection – Different rings on top and bottom
  • R.F.O.
  • Bluetooth chip doesn’t need a battery because it harvests energy from the air
    • Wiliot
    • Embedded in consumer products to provide easy access to a digital manual when the original paper version is long lost, or it could be put on a clothing label and used to communicate the optimal settings to a washing machine
    • $30 million financing from Amazon and Samsung
    • Possible release in 2019 but they are shooting for 2020
    • HOWMAX30 – MAX-30 Single User Earplugs
      • Incorrect part listing on Amazon leads to hilarious reviews

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Zany Bare Fallowdeer Mobile

Atari 2600 Junior with the combo 6507, RIOT, and TIA chip.

Atari 2600 Junior with the combo 6507, RIOT, and TIA chip.

Pinning out the Atari JAN chip by probing the PCB with the scope and multimeter. This is the LUMA signal for the video.

Pinning out the Atari JAN chip by probing the PCB with the scope and multimeter. This is the LUMA signal for the video.

Stephen’s copper coax donut footprint.

Stephen’s copper coax donut footprint.

About the Hosts

Parker dillmann
  Parker Dillmann

Parker is an Electrical Engineer with backgrounds in Embedded System Design and Digital Signal Processing. He got his start in 2005 by hacking Nintendo consoles into portable gaming units. The following year he designed and produced an Atari 2600 video mod to allow the Atari to display a crisp, RF fuzz free picture on newer TVs. Over a thousand Atari video mods where produced by Parker from 2006 to 2011 and the mod is still made by other enthusiasts in the Atari community.

In 2006, Parker enrolled at The University of Texas at Austin as a Petroleum Engineer. After realizing electronics was his passion he switched majors in 2007 to Electrical and Computer Engineering. Following his previous background in making the Atari 2600 video mod, Parker decided to take more board layout classes and circuit design classes. Other areas of study include robotics, microcontroller theory and design, FPGA development with VHDL and Verilog, and image and signal processing with DSPs. In 2010, Parker won a Ti sponsored Launchpad programming and design contest that was held by the IEEE CS chapter at the University. Parker graduated with a BS in Electrical and Computer Engineering in the Spring of 2012.

In the Summer of 2012, Parker was hired on as an Electrical Engineer at Dynamic Perception to design and prototype new electronic products. Here, Parker learned about full product development cycles and honed his board layout skills. Seeing the difficulties in managing operations and FCC/CE compliance testing, Parker thought there had to be a better way for small electronic companies to get their product out in customer's hands.

Parker also runs the blog, longhornengineer.com, where he posts his personal projects, technical guides, and appnotes about board layout design and components.

Stephen Kraig
  Stephen Kraig

Stephen Kraig began his electronics career by building musical oriented circuits in 2003. Stephen is an avid guitar player and, in his down time, manufactures audio electronics including guitar amplifiers, pedals, and pro audio gear. Stephen graduated with a BS in Electrical Engineering from Texas A&M University.

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

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