revivant

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Principal Electrical Engineer

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revivant

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  • 10.17.2017
  • So, where’s pin 1 on those common 0.156” connectors?
  • One of the things I have found frustrating with the KK series is the inconsistency in marking. Some are marked with pin 1, some are marked with the highest pin number (on some), and some apparently are not marked (have you checked the bottom of the connector? There is sometimes a mark there for pin 1). With all of that, the PCB connector does not match the pin 1 designation for the housing. The datasheet for the PCB connector even says as much - "circuit one designation is used to define void location. Circuit one may or may not line up with circuit one on mating connector." I am sure it is probably an issue stemming from changes or additions along the way in the 50 years the series has been in existence.
  • 10.06.2017
  • Teardown: Smart switch provides Bluetooth power control
  • The likely reason for the earth conductor to be screw connected is safety regulations. If it is soldered to the board, then it also needs to be mechanically secure to keep in it in place should the solder joint break. Having a double crimped (wire and insulation) ring tab provides that mechanical security. Either that or they misinterpreted the product safety standard for earth bonding to be mechanically secured (screws, studs, busbars, etc.).
  • 09.15.2017
  • Tesla backlash shows misunderstanding of reality
  • I know this has become the norm with many pieces of test equipment. Software upgrade for more bandwidth, more features, etc. From a production standpoint it does make sense. They designed the equipment (a scope for example) to meet certain bandwidth requirements for the high end model. Should they use different hardware to produce lower level (and thus lower price) models? Not all customers need the high end and do not want to pay for it if it was the only option available. Sell to the lower end and maybe get a conversion later to a higher end model without scrapping hardware seems like a win all the way around. For the Tesla batteries, it was put out there from day 1 that the 60/75 were different only by software limitations with the battery. In the early days, the Model S was available with a 40 kWh battery pack. It only amounted to about 4% of sales, so they discontinued it. If you have a 75 kWh pack and want to lower the price to attract more buyers (60 kWh), why develop and test a new pack when you can save time and money by software limiting the 75 to 60, with the possibility of converting those buyers to 75s at a later date? Still makes perfect sense to me. As a manufacturer, you run the risk of someone hacking the software and unlocking it for free (like Rigol scopes), but that is the risk they choose to take.
  • 01.03.2017
  • Be careful what you name your company
  • I would imagine that in 1976, the thought of their company getting into music two and a half decades later was at the forefront of their vision.
  • 10.18.2016
  • Marketers talk funnier than ever
  • I think a real definition of "courage" is recalling a phone that just started shipping for a battery fire problem. I may not like their phones, but I do have to give Samsung props for having the courage to recall the phones.