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Oliver Sedlacek

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Oliver Sedlacek

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  • 04.04.2014
  • The inexorable rise of the appcessory
  • Quote: Such innovations have encouraged companies that have traditionally focused on software apps for smartphones and tablets to confidently extend their offerings to hardware in the form of peripherals (or accessories) that rely on an app to fulfil their function. The bill for compliance checking will come as a bit of a shock to a software company!
  • 03.20.2014
  • 5 tips for PCB schematic file management
  • Aaargh, using dates in file names is so 20th century. Do revision management properly and store your files under proper revision control. After all tools like Subversion are free, and your file history will get captured.
  • 01.20.2014
  • LEDing it hang out: The downside of higher efficiency
  • One aspect of LED lamps that vexes me is their general poor color rendition (CRI). This also applies to most fluorescent lights, but if you care about light quality, incandescents and halogens are hard to beat. CREE make some LEDs with excellent CRI ratings (93+), but have you ever tried finding out the CRI of an LED lamp?
  • 01.15.2014
  • Tips & Trends: Tackle LED compatibility
  • I want to add another problem with LED lighting, optical compatibility! I've been trying to source LED lighting for over a year, and it's been driving me nuts. 99% of advertised LED lamps do not quote output lumens or CRI (rendition). Mostly all you get is that it's a 10W lamp. Aaaarrrgh.
  • 07.02.2013
  • Flip the switch
  • Diodes are a right 845tard in CAD systems. I've just had some prototype boards made and one of the diodes was fitted the right way round and the other two were reversed. It turned out that we had tow symbols in CAD for diodes but with opposite polarity (i.e. one was A1-K2 and the other was A2-K1). I had inadvertently used both symbols and the design reviewers didn't spot it because the symbols look identical.
  • 05.01.2013
  • IR drop: The 'gift' that keeps on taking
  • I wasn't exactly caught out, but I did struggle with a sensor that was required to work at the end of 4,000 metres of cable. To cut down on cable cost, customers want to use thin gauge wire, so the IR voltage drop was more than the sensor supply voltage. Verifying operation with 4,000 metres of cable was even harder as we wanted to check that we could drive the inductance. As the inductance of a reeled cable is massively different from one laid flat, you start to get into some surreal test scenarios.