ShaneBK

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ShaneBK

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  • 06.26.2017
  • Electronics interference: LG displays and routers
  • Compatibility that isn't ! Do you have a CE style compliance program over the re ? Have all the devices passed both emissions and sensitivity standards ? Do these standards need to be raised ?
  • 10.30.2013
  • That 60W-equivalent LED: What you don’t know, and what no one will tell you…
  • For a lot of people, incandescent bulbs are most used in winter, when the heat, as well as the light, are useful. I recommend using LED lamps ONLY in base-down fittings or places when the light is only on for a few minutes at a time. Some shades make an effective chimney. I prefer LED strip lighting as it almost eliminates shadows though the efficiency isn't great. I do run mostly off 24V DC though. The quality varies hugely, some strips had faulty LEDs from new, others gradually failed, and others again, the encapsulation hardened and darkened.
  • 02.22.2017
  • The world’s smallest schematic
  • It is a pity that more things don't include a schematic stuffed inside. Far too many throw-away things where replacement boards are so expensive that it isn't worth replacing. My washing machine is one such. A board that probably costs less than $10 to make, is available for $400. The complete machine is about $600.
  • 12.29.2016
  • Near-field scanning: useful or misleading?
  • Some years ago, I had a large LED dot-matrix multi-line panel behave like a radar antenna ! The clock line to the shift registers was radiating quite efficiently. The unwanted 8MHz , originally detected during CE compliance testing, noise originated at the CPU, propagated through a differential driver on the control board, then through the differential receivers on each line of the displays. I traced it with a home made probe, and fixed the problem with a 3-terminal filter right beside the CPU. I have no idea why the 80Cxxx chip was producing 8MHz, regardless of the crystal frequency.
  • 11.18.2016
  • The chip glitch
  • One fairly recent debug I did for a customer's unit. I was doing ESD testing, and the thing kept resetting. They had left the reset pin on a uC with just it's internal pullup. An external R and C cured it. They had been chasing that bug for 3 months. A different perspective found it in an hour.
  • 11.18.2016
  • The chip glitch
  • The nicest bit about this is that your efforts were recognised. That is a rare event in my experience as an engineer.
  • 06.19.2016
  • Fuel-gauge ICs help prevent battery clones
  • Good for big manufacturers, bad for others. Big manufacturers can now charge what they like for replacement battery packs, as nobody else can fill that need. More throw-away hardware, because it will be uneconomical to replace the battery.
  • 05.18.2016
  • Wet and dry switching
  • I have come across this in relation to wet (whet?) switches that are used dry. It is said that the contacts don't wet. More often though, I have had problems with battery contacts in low power devices, where THOSE contacts don't wet, and I am still looking for solutions. It seems to me that a lot of (usually dry cell, NiMH, NiCd, and LeClanche) batteries have terminals which won't wet, no matter what I do. This has occurred in some quite expensive equipment.