Design Con 2015

Oliver Sedlacek

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Oliver Sedlacek

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  • 11.21.2014
  • My long-running affection for heat sinks
  • I still often rip heatsinks out of dead products and discard the semiconductors. Is it because I feel a similar affection for them? One thing is for sure, it will still work, and I wont have to worry about latent ESD damage or compromised lifetime! The choice of heatsink has a big influence on the 'perceived quality' of a product. Its weight can be reassuring and its aesthetics are important if it's on the outside of the casework.
  • 12.02.2014
  • Tips for home automation IoT design
  • As a potential customer, what I don't see is any mention of fallback functionality. If my 'smart' light switch can't connect to a coordinator for some reason, I still really, really, really want to be able to turn my lights on and off.
  • 09.14.2014
  • Paralleled transistors and regulators eliminate need for heat sinks
  • This is good basic stuff that most experienced designers should know. I really wouldn't recommend the NE5534 any more, as there are much better parts available now. As an example, the ADA4610-2 beats it on speed (16MHz GBW), power (1.6mA IQ), input offset (0.2mV typ), input bias current (5pA) and output current (70mA). TI-Burr Brown offer the OPA211 and Linear Tech offer the LT1468 and LTC6090.
  • 07.25.2014
  • 11 summer vacation spots for engineers
  • Elephant and Castle wouldn't be one of my suggested tourist destinations in the UK as it's likely to be a big disappointment. I'd suggest Bletcheley Park, home of the WWII code breakers as a much better bet.
  • 03.10.2014
  • Crossovers using the Bernstein Function
  • Having mulled over crossovers a fair few times, I'm also interested in anything that can shed some light on the issues. I've never managed to convince myself that when you look at the time domain you can get anything like a seamless audio 'join' across two drive units. The bass-to-midrange transition doesn't look too bad if it's below say 150Hz, not least because at this wavelength the unit can be placed acoustically close to each other. The mid-to-high transition is really hard to manage, so moving it out of the ear's most senstive frequency range is usually my first tactic.