Phred128

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Phred128

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  • 04.26.2017
  • Neutral woes
  • With regards to loss of neutral, I experienced this twice in 30 years. The first incident was a bad ground in the transformer which resulted in the transformer being replaced. The second was a couple of months ago when squirrels chewed through the neutral on the lead-in to the house. The neutral had two repairs in the near 100' from the transformer to the house, so they replaced the entire cable this time. As far as the distortion of the waveform, it looks like third harmonic distortion due to capacitive loading of the line from switching power supplies. I just put a scope on the power in our lab at work and see the same thing. I've been seeing it for over 30 years, so it is nothing new. Steven
  • 05.12.2005
  • Black boxes capture car-crash data, controversy
  • I find the explanation that the data from the recorder is used by the auto makers to improve reliability, safety, etc to be total BS. How can this be if they don't collect data from all crashed vehicles?
  • 05.29.2015
  • Nothing beats a projection screen
  • Vizio and LG both have 4K 60" TVs now below that price. Sharp has one below 1500, and Samsung below 1600. By Christmas, the 65s will probably be below that.
  • 08.06.2012
  • Are the best engineers OCD?
  • My wife tells me I'm OCD, but I prefer to think of it as paying attention to detail. If I put all the tall glasses in the right side of the top rack of the dishwasher because it is deeper than the left side, it is not OCD. It is logical. It was made for this. Why is such logic so difficult for some people?
  • 07.05.2012
  • Hearing aids hacked
  • I was diagnosed with sensory neural hearing loss in 1975 while in the NAVY (I suspect most service personnel suffer some degree). For many years I was told that hearing aids wouldn't help the level of loss I experienced (initially a greater than -40dB notch at 4KHz). Since the loss has progressed over the years, I eventually became a good candidate for hearing aids. I'm on my third or set of hearing aids ( I get a new pair every four years). My first set was fixed analog. My second set was multi-mode analog. My current pair are digital with modes for (1) Normal Listening, (2) Phone, (3) High ambient noise, (4) Meeting, and one other mode. That other mode was set up while I was at the VA having the hearing aids set up and adjusted. Because I have a good basic understanding of audiology, I was able to tell the technician to set up a special mode with "all adaptive filtering off, flat band adjustment as far as the hearing aids will work" ( beyond 10KHz) for listening to music and TV. Personally I find no reason to hack my haring aids as they were properly adjusted to begin with.