MWagner_MA

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Sr. Electronics Engineer

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MWagner_MA

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  • 11.10.2017
  • Are “beam array” headlights in automotive’s future?
  • I understand that it may not be 1:1, but it will certainly have more elements than current designs. I'm just tired of people saying "gee wiz, look at this!", and having it last only 2yrs. We can't even make microwave ovens anymore...our current GE was at first DOA, then the current one no longer has under-unit lighting..dead... in less than 2yrs. I'm glad GE doesn't build automotive lighting! (I hope :-))
  • 11.10.2017
  • Are “beam array” headlights in automotive’s future?
  • Mean Time To Failure? Osram answered, “we anticipate similar performance to conventional LED lighting solutions.” I'm not sure how you bought that argument when there are 1024 drivers in this assembly when there are only 2 in a conventional headlight (high/low). High tech, yes, overly practical, no. Remember, the "KISS" acronym. I'd rather see a simplified approach with maybe 3 light-sources that would allow one to be shut off that is more directed at on-coming traffic. This would only increase complexity by 50%, not 500%!
  • 10.20.2017
  • 8 Signal generators under $100 compared
  • Even the cheapest crystal controlled units will likely have good frequency accuracy. The challenge is the amplitude control, but you can "calibrate" that with a calibrated scope. I like the one you picked. I would prefer a fully packaged one myself to avoid and "oops" on the bench with loose parts running around. Even in a professional lab, having something like that to control budget isn't a bad choice as long as you have a good frequency reference to check it against periodically.
  • 09.06.2017
  • Beware the TO-220
  • I'm surprised no one has mentioned the obvious - what is the specified thermal impedance of Die to case? If the manufacturer datasheet matches dimensionally, but there is no difference in that spec, then yes, you got scammed.
  • 08.23.2017
  • In defense of the current-feedback amplifier
  • From someone who needs to design for volumes less than 1-5K units per year, and I must be able to source through distribution, all of this is only an academic exercise. Look at the Texas Instruments Website and tell me how many current feedback amps do you see as compared to op-amps, and instrumentation amps. There may be isolated cases of very high speed design where a CFA may be useful, but in 30yrs of engineering, I haven't run into one yet I can't easily solve with an op-amp.
  • 07.12.2017
  • Samsung recall analysis: form factors and battery reliability
  • What I tend to observe these days is engineers under time pressure, and then using the "fingers crossed" method of insuring reliability. Not until a failure occurs can a suggested "design for manufacturing" feature, that costs, be implemented. As fewer management teams originate from the engineering ranks (practicing engineers), their only point of reference is the $$$$. Expect more of this from time to time. "Murphy" is alive and well.
  • 07.11.2017
  • An IBIS-AMI Simulator for the rest of us
  • Can't wait to try it out. Can it also export or convert the IBIS model to a SPICE model? I"m looking to extract a behavioral model of mixed signal components for noise modeling and optimization. Straight analog parts can be straight forward, but digital parts are harder to model the effect of signal noise, and that from the power rail. I was thinking that IBIS models may prove to be a useful tool for this.
  • 07.11.2017
  • Optimizing snubber design through frequency-domain analysis
  • I lost interest as soon as I see: "Here’s a simple and accurate...". That is a college professor mistake. It is up to the reader to decide if you method is easy or difficult for THEM. By the way, you launch in to describing a measurement method and then start speaking of simulation. A very confusing article.
  • 06.26.2017
  • Electronics interference: LG displays and routers
  • Thanks Brian for the detail in the article. The overall skill level of EE's is dropping as companies show a disdain for experience. EMI regs are seemingly treated as a "formality" rather than a tool to make a product more reliable. Masher's comments are a little scary, as a pilot, the last thing you need is comm problems on approach in a busy terminal area.
  • 05.26.2017
  • Is iPad scope worth professional pricetag?
  • Welcome to the "makers" thinking their professional engineers. 16K of memory, what are we using a Commodore 64? Obviously the concept of "aliasing" among other terms is foreign to them. When I see omissions like this you have to wonder about how solid the rest of the engineering was to build the product. If if you ignore the market research - anyone with experience using digital O-Scopes know you need a LOT more than that. Even 100K, as I have seen on some other recent offerings, is way too small. Thanks for the detailed review Mike.