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- Do you know your colour codes?
- Memorized the code at 8 yrs, as far as I can remember was never taught in school or in college. Have seen many resistors where the code was a manufacturing afterthought, such as no spacing between the brown end bands (1%) so you don't know which end to start reading from. Beware of resistors with body colours other than beige or light brown, since they can make the bands appear to be different colours than they really are. ie "Hmmm, is that brown, red, or orange? Better get out the ohm-eater."
- Sub-$20 brilliant bulb includes sensors, BLE, and Wi-Fi
- " control your lights from anywhere in the world" - Why on earth would anyone want to do that? "16 million colors" - As long as one is in the room (and if not, why would they care about color?) why not 3 knobs (potentiometers) each with infinite resolution. Then the number of colors could be bragged as infinite x infinite x infinite - or "infinite Qubed" rather than limited to only 16,777,216. Looks like a case of marketeers desperately trying to dream up the next "killer product" that nobody wants. Nice article, Mr. Goldberg, you ask all the right questions.
- Rugged 16mm LED indicators feature customizable "Secret-Until-Lit" option
- About as useful as those mystery icons on certain websites that reveal nothing until they're clicked. I can see one use for these LED buttons in the area of practical jokery - when lit up, have it say something like "Do not under any circumstances push this button!" or "Armed - countdown initiated"
- Common PCB design mistakes
- When using parts that already exist in a corporate library it pays to hunt up the data sheet anyway, just to make sure the part was defined properly. I once used a part whose schematic symbol showed it was a dual diode, but when I got the prototype boards back it turned out to be a single diode with 2 of the 3 pins shorted together. Nobody else had noticed since they only used 1 of the supposedly 2 diodes in their designs.
- 5 Engineers: What engineering breakthrough are you most thankful for?
- The spear. It put humans from near the bottom to near the top of the food chain and allowed the rest of the engineering breakthroughs to happen.
- EDN Access -- 8.4.94 New philosophy aids shift from schematic-based to HDL-based desig
- Interesting article. Too bad all the links to Figures are broken.
- With this type of fuseholder the fuse is inserted into the cap first, then inserted into the holder. The plastic cap provides the insulation protecting the fingers. John Dunn is correct.
- Review: Tekbox Near-Field Probes
- Good to know about the shield gap position. With the soft RG-174 the gap is placed in the center of the oval-shaped loop by cutting away a small amount of the outer jacket and braided shield. We kept the loop flat against and similar distances from the transformers under test (TUTs?) by placing a flat magnetically-transparent spacer between the loop and the transformers (aka a full pad of Post-It notes which happened to be at hand :-)
- Tone dialing telephones are introduced, November 18, 1963
- One nice attribute of the pulse dialing system was that one could go into a phone booth and save a dime (yeah, I know I'm dating myself) by jiggling the hook up and down at the same timing as the rotary dial to generate the pulses. I won't say who...
- Review: Tekbox Near-Field Probes
- For those whose corporate bean-counters prevent use of exotic goodies like these, a length of thin coaxial cable such as RG-174 can be made into similar H or E field probes. While they may not be as accurate at higher frequencies, they can certainly show things like the difference in magnetic flux leakage levels between two supposedly identical transformers from different production batches.
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