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  1. OBW0549

    Learn Arduino

    If you already have a decent assortment of electronic components on hand like resistors, capacitors, transistors, LEDs, switches, potentiometers, etc, just buy an Arduino Uno. If you don't, you might get a kit, such as this one by Vilros. Elegoo offers similar kits, and I imagine other...
  2. OBW0549

    Pressure sensor for focus pads

    I would suggest an accelerometer installed in the focus pad, on the back side; it should do a pretty good job of registering each hit and giving an indication of relative strength.
  3. OBW0549

    Capacitive Force Sensor Circuit Project

    As an analog design engineer who has done this many times over the years, I can tell you that designing the signal conditioning circuitry for capacitive sensors is NOT a trivial task, even for an experienced designer. The design task becomes especially difficult with sensors like these, where...
  4. OBW0549

    Varying inductance

    SPICE does both time-domain simulation (the .TRAN analysis) and frequency-domain simulation (the .AC analysis).
  5. OBW0549

    What vibration sensor for bearing monitoring

    If you simply Google the phrase, "vibration sensor for bearing monitoring" you'll get all kinds of good info. Bearing condition monitoring is a well-established science/art, and so are the devices and methods for doing it.
  6. OBW0549

    Nostalgia

    I remember it well, from my first PC (Leading Edge D2, with an ultra-fast 10 MHz 80286). I remember GWBASIC, too. Ugh. Have kept: My father's collection of nuts, screws and other assorted fasteners. My copy of Volume 1, Issue 1 of Byte magazine. My copy of the GE Transistor Manual (1964...
  7. OBW0549

    Real Solder

    I've been buying mine from Amazon.com; search on there for "solder 63 37 rosin".
  8. OBW0549

    Frequency and time confusion

    Neither. You simply will have to become adept at both. There is no way around it. Practice, practice, and more practice.
  9. OBW0549

    Now a days which is the best technology to do a project

    You have not given us enough information to even guess at an answer to your question. We don't even know for sure what branch of engineering you're in, although we're probably willing to assume it's Electrical and not Mechanical, Industrial, Chemical or Aeronautical. Is it EE? If so, what is...
  10. OBW0549

    Magazines

    The only magazine I have left from my once-vast collection is my copy of Volume 1, Issue 1 (September 1975) of Byte magazine. I keep it around to remind myself how far we've come from those heady days of home-brewed 8008, 8080 and 6800 computer systems, front panels with toggle switches to...
  11. OBW0549

    The new types of IOT

    Nah. More like "RTFM" but with the "DS" meaning "Data Sheet."
  12. OBW0549

    The new types of IOT

    I wish I knew-- until now, no one has even commented on it!
  13. OBW0549

    The new types of IOT

    Whatever the next big IOT thing is, I doubt it will be connecting your door lock to the Internet: Update gone wrong leaves 500 smart locks inoperable Seriously, what kind of naive, trusting fool would allow access to his home to be controllable over the Internet???
  14. OBW0549

    What is the username and password for the Raspberry Pi?

    For your future reference, Raspberry Pi maintain a collection of forums at https://www.raspberrypi.org/forums/ where you can discuss anything related to the RPi.
  15. OBW0549

    electrostatics

    No.
  16. OBW0549

    I thought I'd measure the leakage current of a few caps

    Isopropanol (and most other alcohols, I suspect) does a good job of dissolving polystyrene, probably not a good thing for your capacitor. If I remember correctly, it's also hydrophilic and hygroscopic, and whatever water it picks up will most certainly increase the leakage current. I'm not...
  17. OBW0549

    circuit to show how much treble or bass

    That circuit isn't going to "control" anything; all it will do is flash some LEDs (maybe, if you're lucky). That makes absolutely ZERO sense. It's a good example of what I call "voodoo electronics," in which a person who has no understanding of electronics believes stuff happens by magic...
  18. OBW0549

    Homemade capacitors, that hold a charge?

    Ummm... no. Halving the distance will double the capacitance, not quadruple it. See here for details.
  19. OBW0549

    Regarding Decoupling Capacitor

    A small (usually between 10 nF and 100 nF) capacitor connected between a power pin of an IC (Vcc, Vdd, Vee, etc.) and its ground pin. In digital circuits, it acts primarily to keep the IC's supply voltage constant during logic state transitions, during which IC supply current typically spikes...
  20. OBW0549

    Active Filter Design

    That works, though for that high a frequency my first guess for C1 would be something closer to 0.01μF or even 1000pF; that's just my particular "gut feel", though. As a general rule of thumb, I try to make sure that any loads on an op amp's output are no smaller than 1.0kΩ; the lower the load...
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