Michael Dunn

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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
  • 09.12.2017
  • 4 Comment(s)
Sziklai transistors: What’s that?
  • 09.06.2017
  • 17 Comment(s)
Beware the TO-220
  • 08.18.2017
  • 8 Comment(s)
Chinese PCB shop spam is a thing
  • 08.14.2017
  • 4 Comment(s)
Old wine in new glass ID system
  • 07.16.2017
  • 1 Comment(s)
Home reflow sees the light
  • 06.30.2017
  • 11 Comment(s)
Happy 150th Canada: The Companies
  • 06.29.2017
  • 4 Comment(s)
Happy 150th Canada: The Institutions
  • 09.12.2017
  • Sziklai transistors: What’s that?
  • W'paedia says: As with a Darlington pair, a resistor (e.g., 100Ω–1kΩ) is usually connected between Q2's emitter and base to improve its turn-off time (i.e., its performance for high frequency signals).
  • 09.15.2017
  • Tesla backlash shows misunderstanding of reality
  • Software-enabled hardware options have of course become pretty standard in test equipment like scopes. While I can understand, even appreciate, the rationale, I still find the concept repugnant. I've paid for hardware I can't use??? Allow me to shame the "big boys" by once again pointing out Pico's (and many other smaller mfrs') refusal to play such games, and their constantly improving software that's applicable to all scopes in their line-up, all options included.
  • 09.06.2017
  • Beware the TO-220
  • Interesting. I've also encountered much package variation, but have no idea how many of them fit within the TO-3 spec. I've also heard stories of 3055 silicon not always being up to snuff. I don't know exactly which specs JEDEC requires a part to meet for it to be called a certain 2N number. Perhaps some of the subtler ones aren't tested.
  • 09.06.2017
  • Beware the TO-220
  • And according to JEDEC, there are only AB & AC types. A, -1, -3, etc. are presumably all manufacturer-specific.
  • 09.06.2017
  • Beware the TO-220
  • Well, blow me down with a muffin fan. I went straight to the source – JEDEC. The 2002(!) TO-220 drawing specifies tab thickness as 20 to 55 mils! No special designations or subvarieties required. Wow...we've been living under this single-gauge shadow all these years; only recently did the axe fall, slicing the tab in half. Interesting: ON's TO-220 package drawing is at rev.O (yes, letter "O"; I thought "I" & "O" were usually skipped...), but their 'single gauge' drawing is rev.A, dated 2010! Again...it's been around awhile. The rev.O drawing includes the single-gauge variant. I love standards. There are so many of them.
  • 09.06.2017
  • Beware the TO-220
  • According to Vishay, the difference between TO-220AB & TO-220-1 is barely noticable: http://www.vishay.com/docs/71195/to220ab.pdf http://www.vishay.com/docs/66542/to-220-1.pdf TO-220A? Don't know.
  • 09.06.2017
  • Beware the TO-220
  • Yeah, I spoke too soon about that. Even the little clip-on sinks I'm using on my board (also Aavid IIRC) don't seem to properly press down on the thinner tab, just the plastic case. Ack.
  • 08.16.2017
  • Whipping a cheap LED PSU into usable shape
  • I totally understand your opinions and point of view. Some responses and thoughts: These products (and many similar ones, like 3rd-party phone chargers say) are sold throughout the world. Far better we expose them here than close our eyes and pretend they don't exist. How can we stop such poor products from being sold given the global marketplace? Because I'd love to do so. Any such line-connected items here go into closed elctrical boxes. I'm in a rural location, so any EMI problems will affect only me. See http://www.edn.com/electronics-blogs/benchtalk/4442812/Why-is-everything-junk---Heat-pump-edition- for some pretty poorly behaved *name brand* electronics.