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Measuring up your interview questions

MacroFab Engineering Podcast #322

Measuring up Your Interview Questions

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April 1, 2022, Episode #322

Interview questions, love em or hate em it is all something we have to go through. How does your technique measure up to Stephen's and Parker's?

Previous Podcast where we discussed Engineering Resumes

Interviewer Questions and Techniques?

  • Stephen
    • Schematic PDF for the test
    • There is no output when a 10Vp-p signal is injected into the input. Turning the pot or applying a voltage to the input cv jack does not have any effect on the output. It is stuck at zero volts.
      • Alternate – What if the output was stuck at + or – 11V?
    • The output is stuck at unity gain. 10VPP in results in 10VPP out. The pot and CV controls do nothing to adjust the output level.
    • The unit seems to work for all controls other than the CV offset input. That seems to only be unipolar. Positive voltage does not have an effect but negative voltage does.
      • Hint: The output of U5.1 with zero volts in is reading zero volts.
      • Bonus – What is the input range for the cv input if the microprocessor has an input range of 3.3V?
    • The unit turns on and trips the constant current trigger on the power supply – What do you do?
    • What is the input impedance of both the signal input and the CV input?
      • What is the output impedance?
    • What is the purpose of C1, C2, and C3?
      • What is their cutoffs?
    • What does R2 do in this circuit?
  • Parker
    • Resume
    • Data Support Technicians
    • Test Engineers
    • Putting together test question / examples

PCB Ruler

  • Don’t want to do just a normal one
  • What do engineers actually want on these?

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!