Oliver Sedlacek

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Oliver Sedlacek

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  • 12.22.2015
  • Reduce relay coil current with a reset controller IC
  • Nice idea, and very timely! I would definitely use the same transistor type for 'pull-in' and 'hold' to keep my BOM line count down. Digital transistors still tend to be cheaper than MOSFETs, so I might investigate them for this application.
  • 12.18.2015
  • Audio evaluation & measurement: A sense of perspective
  • As a professional analogue electronics engineer and an amateur HiFi builder, I'm fascinated by the relationship between quantifiable deficiencies and perceived audio quality. A system may have impressive THD, SNR and bandwidth, and may still sound disappointing. I don't claim to have golden ears, but I find sound differences easy to pick out, as do press-ganged friends, so over the years I've come to the conclusion that the favoured metrics are pretty useless. As to the subject of what to measure, clipping behaviour seems to matter greatly, as do the properties of any energy storage elements (capacitors, inductors, voicecoils) in the signal chain.
  • 11.08.2015
  • What's a stereo system, anyway?
  • I don't listen to as much music as I used to, but I've recently got my record deck overhauled and I've been playing my vinyl again. Hifi is what got me into electronics all those years ago, and I still build my own amplifiers and speakers. I've come to the conclusion that you either listen to the music, or you listen to the Hifi. If the Hifi is really good, you can stop listening to it and enjoy the music.
  • 06.29.2015
  • Keeping smart lamps “Energy-Efficiency Smart”
  • I'm depressingly unsurprised by this story. The LED manufacturers are producing some really impressive LEDs, but what the consumer gets is very disappointing. I've been hoping to cut my electricity bills at home (and keep the house cooler in the hot weather), but I still can't easily buy quality LED lamps to suit my needs.
  • 01.27.2015
  • Moore's Law extends to cover human progress
  • Although the problems in silicon scaling get tougher, more engineers are working on it because there is more money at stake. Moore's law will run out for silicon electronics when the financial rewards of the smaller transistors runs out. The current market driver is probably the smartphone/tablet, and that still has legs.
  • 05.25.2015
  • IoT security may lie in numbers
  • The upward trend in threats is quite worrying, and I believe the worst is yet to come. Users are too naive to demand robust security from IoT devices and producers are reluctant to invest the time and effort as it lengthens their 'time to market'.