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Tom anderson the gold ear sympathetic

MacroFab Engineering Podcast #293

Tom Anderson, the Gold Ear Sympathetic

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September 8, 2021, Episode #293

Tom Anderson joins Parker and Stephen to discuss metrology and how taking measurements relate to electrical engineering and product design.

Tom Anderson

  • An old-timer engineer working from HP/Agilent/Keysight
  • Currently still employed at Keysight
  • Volunteering at Alembic, where he designs electronics for bass guitars
  • Career includes:
    • Design of firmware
    • Digital
    • Analog
    • Microwave
    • Optical
    • Power supplies
    • Software
    • Information systems

Metrology and You

  • Do I need to worry about all of this? (as a hobbyist, is accuracy important?)-
  • Measure with micrometer…
  • Taking Measurements
    • voltage, current, resistance, inductance, capacitance, Q, frequency, time, noise, RF/microwave
    • Measurement Uncertainty
      • +/- 0.1dB specification – what can go wrong?
  • How do you make things more accurate?
    • System engineering – when the boards are put together, does the system work?
    • Testing the idea that multiple resistors are tighter tolerance than single
      • Are the values random?
    • Sources of errors – narrow things down to the path between a sensor and an ADC
      • Temperature
      • Noise, thermal
      • Noise, switching power supply, rectifier diodes
      • Noise, clock, data, address
      • DC shift – where does the ground current flow? Screws, contact resistance, and X-Acto blades.
    • Offset voltage and current
  • Connector Repeatability
  • Temperature 
    • Repeatability/Skid
    • Controlling temperature (room air, coffee cup, fingers, oven proportional control)
Tom Anderson

Tom Anderson

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,, 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!