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Recent content by vthielen

  1. V

    [SOLVED] LCD module with white vertical stripes

    This problem was caused by a looste connection in the tail of the LCD display.
  2. V

    Problem with LT3092 current source

    Try reducing the supply voltage, They probably run so hot now because they get a much too high voltage. You can probably do this easily by changing a regulator or a zener value
  3. V

    Problem with LT3092 current source

    Then the heating probably causes the problem (maybe it is a safety mechanism to avoid blowing up the chip) You can check this by cooling it down temporarily (there are special sprays for that, maybe blowing do the trick) you can do the following: - buy the DD or ST package version with heat...
  4. V

    Problem with LT3092 current source

    Maybe the chip is heating up? Typical for current sources is that they can dissipate a lot of power, especially if the supply voltage is high. Best is to make sure there is a groundplane with large surface on either PCB side underneath the chip (connected between them with via's for heat...
  5. V

    Decopling capacitors value selection

    The reason that 100nF is more or less the standard value for high frequency decoupling is that higher values start to behave worse at high frequencies: the parasitic series inductance increases, which reduces the impedance at high frequencies, so high frequency noise is less efficiently...
  6. V

    Decopling capacitors value selection

    Generally decoupling caps are needed for two things: - to keep high frequency currents from flowing over the PCB tracks to the supply (causing EMC problems by radiation and injecting noise on the supply of other circuits/chips) - to short-circuit noise on the supply of sensitive circuits...
  7. V

    experience with zener reliability?

    I need to (try-to) design electronics for 30-years lifespan continuous operation. I had some trouble with zeners that failed in a couple of years time, even though they where only used at about 30% of specified power ratings at room temperature. Does anybody else have similar experiance? Might...
  8. V

    [SOLVED] LCD module with white vertical stripes

    I am developing a project loosely based on the the STM3220G demoboard. I am using a different LCD display module though: I am now using this one: https://www.displayfuture.com/Display/datasheet/TFT/KWH032ST03-F02.pdf I am interfacing this using the ST STM32-GUI library (with default settings) I...
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