Michael Dunn

's profile
image
Editor in chief

Michael Dunn is editor-in-chief of EDN, and 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. 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. He was previously editor-in-chief of Scope Junction: http://edn.com/collections/4422580/Scope-Junction-blogs


Michael Dunn

's contributions
  • 05.26.2017
  • 2 Comment(s)
Wireless scope module review
  • 05.01.2017
  • 4 Comment(s)
Hubsan FPV drone teardown
  • 04.26.2017
  • 12 Comment(s)
Neutral woes
  • 04.03.2017
  • 10 Comment(s)
I Sing the Capacitor Electric
  • 03.01.2017
  • 15 Comment(s)
Grammar and the engineer
  • 01.25.2017
  • 5 Comment(s)
VoIP phone teardown
  • 05.26.2017
  • Wireless scope module review
  • Even "big name" traditional scopes beat out this module. Some examples from Tektronix: MSO2024B $3610 4ch 16 dig 200MHz 1GSa 1MPoint (no DDS) MDO3024 $4590 4ch (opt dig) 200MHz 2.5GSa 10MPoints (opt SA & DDS)
  • 03.17.2017
  • Your other hobbies: Engineering-like?
  • Wow, check out the paper gates & adder! https://www.youtube.com/watch?v=yvANcR4mQ7M It's a bit confusing because of the layout – just pay close attention to the signal labels...
  • 04.26.2017
  • Neutral woes
  • Three-phase to the home?!? That's something I've never heard of. Interesting... But correct, this is "two-phase". The transformer primary is fed by 7.2kV and earth ground. Ground is connected by wire, but as demonstrated in my previous blog, there's enough earth conductivity for the system to mostly work even when the wire is broken. The secondary is 240 VCT, giving two 120V legs. The centre-tap is earth-grounded at both the transformer and panel end. It doubles as neutral and earth ground, hence needing to be physically earthed close to the panel so the ground can't lift in the presence of neutral current or a fault.
  • 04.26.2017
  • Neutral woes
  • Interesting, thanks. The "clipped" waveform is certainly consistent with poor power factor (no PFC) devices drawing high currents at the peaks, but the waveshape doesn't really change under different loadings. I may yet try absolutely zero (0) loading...turn EVERYTHING off (except the scope...and I'll measure the other side of the line!), but I'm pretty certain the distortion is from the "grid".
  • 04.10.1997
  • Analog multipliers take cube root
  • The online version here is probably not directly recoverable, but amazingly, I do have the print version! I'll restore this when I have some time, so check back on occasion.