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  1. (*steve*)

    How are all our colleagues in Florida?

    You have beaches segregated by politics?!?! :-D Glad to hear you were well away from the serious end of that storm.
  2. (*steve*)

    Can I create and inexpensive wearable proximity warning device for the visually impaired?

    You can make life easier for you by scanning the scene with an IR laser and looking for the position of the bright spot in a pair of stereo images. Of course there may be safety issues wearing a scanning laser in a room full of people (mostly if it stops scanning)
  3. (*steve*)

    Switch for Piezo Injector

    Have you heard of a MOSFET?
  4. (*steve*)

    Electronics beginner

    Hi. Welcome to Electronics Point.
  5. (*steve*)

    Need help keeping a rigid mechanism in a 60ºC(140ºF) Incubator

    Clip the wings of the nuts and bolts. They should stop flying. I don't understand your problem and I wonder if you need two threads. Isn't this similar to your other thread?
  6. (*steve*)

    How are all our colleagues in Florida?

    I've seen some fairly nasty photos...
  7. (*steve*)

    Can I create and inexpensive wearable proximity warning device for the visually impaired?

    With those components, this is how I would do it. Bonus is that no additional power supply is required! Wear a belt or a headband that has long pcbs sticking out of it. The wearer will get haptic feedback when they approach an object.
  8. (*steve*)

    Need help designing a 194.0 °F bioreactor for cell culture.

    Acrylic gets soft at those temperatures Get yourself a sous vide machine :-)
  9. (*steve*)

    Comedy Thread

    I think I'll just let that one slide by.
  10. (*steve*)

    Changing out Electrolytic Caps for Polymer Ones

    Polymer capacitors are electrolytic capacitors. It's just that the electrolyte is a solid polymer. There is another thread where I went into some detail, but basically they can't leak or dry out, but they have higher leakage than regular aluminium wet electrolyte caps. See here
  11. (*steve*)

    Changing out Electrolytic Caps for Polymer Ones

    Possibly they were surface mount capacitors of the sort that are really tricky to desolder and resolder again.
  12. (*steve*)

    Book: Transistor Circuit Design, With Experiments, by Delton T. Horn

    Equation 1 uses Ie instead of Ic. Using the former makes the calculations easier. In fact it will later be changed back to Ic. The difference is the base current, which is typically explained away as being "small compared to Ic". The same style of simplifications are seen in many other...
  13. (*steve*)

    Difference between union and structure

    @Harald Kapp I think you mean memory locations x0001 to x0004. Also it may be important if the machine is big big endian, little little endian, big little endian or little big endian for longs as to which byte is first. @anukalp my explanations are not helping you. I do not wish to confuse...
  14. (*steve*)

    Hi I’m Justin

    Hello Edgar, welcome to Electronics Point.
  15. (*steve*)

    Difference between union and structure

    Ok. I'll stop then.
  16. (*steve*)

    Book: Transistor Circuit Design, With Experiments, by Delton T. Horn

    Ratch's observations are irrelevant to the approximation being discussed in this book. Ratch's is the sort of person who, if you were to post a photo showing a rule next to an object for scale, would argue that it didn't tell us anything unless we know the relative speed of the items.
  17. (*steve*)

    Difference between union and structure

    But what exactly is stored in those bytes? If you set your integer to -75, what would the character be? Similarly, if you set the integer to zero, then placed an "A" in the character variable, what value would the integer have? You need to know this if you're using unions in one particular...
  18. (*steve*)

    Base resistor and MOSFET + Rectifier Diode Selection for Solenoid actuation?

    In the resources section the are a couple of resources dealing with switching loads using transistors which will help you in the case you've drawn. For a MOSFET, the threshold voltage (Vgs(th)) should be significantly less than the gate voltage you intend to apply.
  19. (*steve*)

    Why does a LED tube light need a ballast?

    A traditional florescent bulb is a device with a breakdown voltage and a negative resistance. Getting your head around these is not trivial. Led bulbs are completely different but have their own issues. Neither can be connected to AC mains directly, requiring a driver of some sort...
  20. (*steve*)

    Book: Transistor Circuit Design, With Experiments, by Delton T. Horn

    Beta appears to be present in every equation it should be. Your photograph is a bit fuzzy, but I can make most of it out. I have to assume what some of it is though, so a better photograph might allow me to find problems.
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