dt_hayden

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dt_hayden

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  • 04.03.2017
  • I Sing the Capacitor Electric
  • I've never heard of film caps singing, but have never used them in high voltage AC applications either. At one place I worked, a guy had an idea to drive a single twisted wire pair within a telecom cable, with a swept frequency signal. The he built a highly sensitive acoustic probe which was held against the cable. Surprisingly, even in a large tightly bundled cable (100 pairs), the conductor pair would vibrate enough to be detected by the audio detector. The idea was that the vibration would stop where the pair had an open circuit, allowing physical isolation of a fault location.
  • 10.10.2016
  • Incandescent lamps and service life
  • I put the 3 exterior LED lights outside my shop on inline photosensors. Enven though the power draw is small, no sense in having them on 2x or 3x what is useful.
  • 10.18.2016
  • Marketers talk funnier than ever
  • OTA Updates - meant to imply a seamless method to keep the user on the bleeding edge of features. Is mainly used to patch functional bugs and security loopholes that could not be developed sufficiently in the rush to ship product.
  • 10.18.2016
  • Marketers talk funnier than ever
  • Shipping Product - used to indicate that a product is market ready for general use. The reality is the lab is scrambling to release something to manufacturing to meet arbitrary deadlines set by marketing. Occasionally, a bug filled prototype may be in the hands of one unfortunate early adopter. Reach Out - the 21st century update to "I will call you". The more times you hear this from a person is inversely proportional to the chance you will ever hear from them again. Disruptive Technology - they have found the answer to a problem that does not exist at a price which no one is willing to pay.
  • 10.05.2016
  • Why is everything junk? (Heat-pump edition)
  • Econo Cool sounds like they raise the temperature setting while creating a dynamic airflow by moving vents. (Think of a simple oscillating fan.) The energy savings are via the higher temperature setting. (I have a Costco purchased tower fan which oscillates and/or blows variable air, a "wind function" I think they call it. It is actually pretty nice.) The frustrations of the remotes are probably due to being products designed for multiple markets. The actual marking on the remote would (I hope) be in the local language but the number of buttons and their use would be fixed (as would display icons). The use model for the various markets may be dissimilar enough to cause some confusion/frustration but not enough to warrant different product designs and the higher resulting costs (they have evidently decided).
  • 10.05.2016
  • Why is everything junk? (Heat-pump edition)
  • For customers with large loads, our local utility imposes power quality standards which I believe are based on harmonic distortion. Variable frequency drive pumps for irrigation are a notorious problem. You may want to request an assessment from your local utility, to see if the heatpump is a unfriendly load to the system (or installed improperly). However, any fixes would probably be on your dime. I think there have been instances where our local utility has found problems in their distribution infrastructure, fixed them, and resolved problems. I don't think you can really blame Mitsubishi, at least not yet. If their products passes whatever specifications are in place (probably none for power quality), and the induction range passes, it's up to the "system designer" to ensure it is installed properly and works together.