Michael Dunn

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Editor, Design Ideas, IC/FPGA, PCB, and Medical Design Centres

Michael Dunn has been messing with electronics almost as long as he's been walking. He got his first scope around age 15, and things have been going downhill ever since. The scopes now vie with wine racks, harpsichords, calculators, and 19th century pianos for space. Over the years, he's designed for the automotive, medical, industrial, communications, and consumer industries, as both freelancer and employee, working with analog, digital, micros, and software. Since 2000, he's run the TekScopes Yahoogroup, now with over 5,000 members, and he was previously editor-in-chief of Scope Junction.







Michael Dunn

's contributions
  • 01.10.2017
  • Protect your boost converter
  • Interesting coincidence: both this and the last DI are power-related and use MOSFET parasitic diodes: Body diodes simplify UPS & energy recovery circuits http://www.edn.com/design/power-management/4443225/Body-diodes-simplify-UPS---energy-recovery-circuits
  • 01.06.2017
  • Properly ground your circuits
  • I'm glad you found Dan's seminar helpful! I met him at PCB West, and brought him to DesignCon last year to give a talk.
  • 12.06.2016
  • ICs of the 1930s & 1940s
  • Multiple components on one monolithic substrate? I choose to call that an integrated circuit. Wikipedia claims: "He was able to create resistors, capacitors, and inductors, as well as the electrical connections between them, on a single bakelite blank by this process. This work was carried out around 1936 and 1937, several years prior to the development of the printed circuit board by Paul Eisler in 1943." 1936.
  • 12.12.2016
  • Scoping a filter response – with math
  • True enough – there are some very nicely done programs out there that use standard audio I/O. I wonder if any of the scope programs have "high-end" scopey features... Hmm...thanks for the article idea :-) Near the top of my project to-do list is a Rubidium-based signal generator/DDS with lots of features, and output from DC to light... okay, to 1GHz at least.
  • 12.12.2016
  • Scoping a filter response – with math
  • Well, I did begin the blog with: "A while ago (in a galaxy a few blocks away)" :-) An earlier version was posted on our old Scope Junction site. The resolution's not too shabby – 1k × 768, tho I guess one can find better these days. Like a lot of Tek scopes, "fast acquisition" is a separate mode. And I don't think math works in that mode...
  • 10.05.2016
  • Why is everything junk? (Heat-pump edition)
  • I forgot to mention in the article that the wideband AF electrical noise generated by the MXZ unit actually makes the circuit breaker "sing"!!! Believe it or not. Breakers generally have several mechanisms for opening the circuit, one of which is magnetic: a solenoid throws open the breaker when the current goes above the trip point. Here, it's behaving like a little speaker, the "cone" probably being the trip armature.