Design products for many industries
- Tale of two thermostats: Nest teardown
- I thought the review was lacking. Technical but not much depth. Reviewing packaging? Something I expect to find in a consumer review - not in a EDN break down comparison. Nothing to indicate any real info about reliability differences. (gotta work ? yes!) Nest has obviously done a better job of selling it's product as "designed"... (a'la Apple ideals of design). This is a big deal for marketing to the consumer directly. But as MWagner_MA has pointed out, this doesn't impress the professional installer much. But there is nothing keeping Honeywell's design from making improvements to match or exceed any features on the Nest design (it's second gen .. could have a people movement detection - if that is really the selling feature being significant) .. There is much to question about "savings".. that either of these products will provide over a simple thermostat. http://www.getrichslowly.org/blog/2011/03/21/do-programmable-thermostats-really-save-money/ At the point a building has enough IoT devices to be consolidated to provide a truly integrated experience (building automation).. .do I really expect the thermostat to be tying it all together? Optimizing power consumption, maintenance, security, lighting, etc..? Do we expect the normal home owner / maintenance guy to tie everything together? For a significantly more comfortable house or cost savings, it takes more than one or two points of measurement for temperature and humidity... and continually changing the set points. My point: I am not convinced either product is worth their cost or effort. or any product that presents itself as a "silver bullet" improvement to most homes.
- Glossing over lossy capacitors
- I am also annoyed with poorly thought out specs... (often the result of marketing / sales people being lazy) And I smiled reading your joke (Pious, gotta remember that one)... Still... I am aware that many instruments are actually wired into during the testing they perform on a system. So this requirement MIGHT be valid .... Not all "probes" are held in place with a human hand - especially logic probes (got 16 hands?) Most standard avionics and military products are tested @-55 to +125C.
- Quick-Turn PCB shop review project: Step 1, the PCB
- Very interested in seeing the results of this experiment. I understand that many here will never "get serious" on the pcb design work and want to spend zero for their development tools. But EDN isn't really a hobbyist forum.. it was intended for electronic engineers As a engineer, I wouldn't want to spend ANY time learning a tool that I would quickly become limited by. I simply don't have the time. I would recommend any professional system that had: - a zero cost evaluation version, - was usable at work - was easy to use (doesn't require daily use to remain proficient) - interactive links between schematic and pcb layout - integrated well with other tools (most important- mechanical 3D, then simulation tools) Numerous products meet these requirements. At present I am using Cadint. (works with fine with Wine) (cadint.com) Only complaint: documentation is weak Greatest strength: user interface on pcb and schematic is consistent and easy. While it has nice 3D features.. I really love how easy it is to export pcb assembly into IDF formats for work in Solidworks.
- When I was making Thick film hybrids back in the 80s.. we (micro-electronics processing engineers) had to address the rheology of pastes being screen printed. We were printing gold, platinum, silver, etc.. layers and firing on to ceramic. Wire bonding the raw IC die to the conductor patterns. Still an issue when screen printing solder paste on SMT assemblies. The pastes "recovery" (of viscosity) time VS the printing (shear) speed being used. Today, most SMT production people just "know" the first few prints of solder paste are questionable (image of solder paste on pads - not ideal) - till an equilibrium is established between the two characteristics of the paste. Break a rhythm in printing? start all over again. Rheology... ( bigger scope of thixotropic related issues).. an important thing to know about.
- Too little of a bad thing
- OK ... Where did you find "good" money? Of course, if they will take "Bad" money for their MOSFETs .. why care? And then there is that "money being the root of all evil" thing..... (go ahead .. smile! it won't hurt much) Regardless, you are correct. "max" in a specification should mean "max" (under specified conditions).
- Product How-to: Isolated PLC digital inputs for industrial control
- While isolation of real world signals from sensitive logic is a "good" thing... This solution doesn't really provide isolation BETWEEN inputs , which is often an equally significant issue for industrial applications.
- Disappearing data
- Always better to provide a clean hardware design. In this case, a clean reset release after everything has settled down.. But .. if the software solution REALLY works (not just "sorta" works).... I would be hard pressed to see the value in making any hardware changes. The real risk: future designs at that company example: "We didn't need a clean reset before! why spend any amount on a reset IC?" That would be risky thinking.
- NIST SP 800-82, rev. 1 security updates—Will your company implement?
- I don't see any recommendations that haven't been known for a very long time. "Where are the teeth"...? The incentive to providing most of these security measures is: Monetary loss demonstrated, it is that simple. Forget incentives that are based on providing a more "robust" service to customers... they don't work... until there is demonstrated monetary loss related to it. There may or may not be a relationship.. (money/quality to service or product). But until the monetary loss has been quantified.. not much will change for most corp or bureaucracy decision makers. How much is quality worth? How much is security worth? Until is is tested. (loses incurred).. Most systems won't change. When risks are demonstrated to be real... things change. Think : natural disasters.. (Sandy, etc..) or terrorists (9-11, etc..) all known risks before hand, ignored until demonstrated. The problem: Society continues to demonstrate very poor ways of learning.
- Shields are your friend, except when...
- Anto: The equation was to approximate the lowest resonate frequency... not ALL the resonate frequencies... it is not intended to explain the higher frequency resonate points. As stated, the shielded area represents a "complex" resonate chamber. With cover and without cover... smallest variations in the surface can effect this, orientation of the injection/reception points, etc... all have an impact. The points: - Don't assume shielding of circuit is all good. (regardless of the form the shielding takes - Mulpin included) - Recognize the issues that come with circuits operating at higher and higher frequencies.
- What is the biggest mistake you have made as an engineer?
- Biggest mistake? Answering this question once before....(!) If you can answer this question while giving details.... you have (pick from following list): a) not been given much responsibility b) not been an engineer very long c) not taken any real risks. d) been VERY lucky.
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