Search results

  1. AnalogKid

    Setting up a Common Anode Dual LED with one reference point.

    Here is the basic idea from a post on another forum. In your case, SW1 is replaced by the uC open-collector output pin 16. When the output is open-circuit, there is no current path for D6 so it is off. D7 is lit with current through R4. When the output is pulling low, D6 now has a current...
  2. AnalogKid

    Setting up a Common Anode Dual LED with one reference point.

    If U11 pin 16 is rated to sink the amount of LED current you want without its output voltage rising above 0.4 V, then your circuit should work as is. There is another connection trick that requires one extra diode, but no transistor and only one current-limiting resistor. What is the voltage...
  3. AnalogKid

    Electronics seems like magic!

    I can smell the BS through my wifi. ak
  4. AnalogKid

    Electronics seems like magic!

    The diode is a demodulator, not a modulator. These worked well long ago because there were so few sources of RFI. Cold water pipe as a GND - yes. Barbed wire fence as an antenna - maybe, but not very well; too many parallel paths to GND (fence posts). You don't hear about it because you...
  5. AnalogKid

    Electronics seems like magic!

    There are hundreds of books on electronic circuit design. If you include applications notes, design notes, technical papers, etc., then thousands. Aside from real textbook-type-books, chip vendors have huge online libraries. Analog Devices now includes Linear Technology, and Texas Instruments...
  6. AnalogKid

    Electronics seems like magic!

    They are not different kinds, they are variations of the same theme. The only real difference among them is the percentage of coverage of the shield. ak
  7. AnalogKid

    Electronics seems like magic!

    False equivalence. The first transistor was the size of a baseball. ak
  8. AnalogKid

    Electronics seems like magic!

    Way too much to process. But, some low hanging fruit. Nope. Complained about in the 80's, disproved in the 90's. ak
  9. AnalogKid

    Electronics seems like magic!

    BTW, he *invented* coaxial cable. ak
  10. AnalogKid

    Electronics seems like magic!

    Really? US patents apply to all of the states all of the time. Whether or not the patent holder chooses to enforce restrictions is their choice. You can't "escape" licensing fees simply by moving. "Southern California was also chosen because of its beautiful year-round weather and varied...
  11. AnalogKid

    Electronics seems like magic!

    Edison was a machinist and a botanist. Gates and Jobs were typists. ak
  12. AnalogKid

    Electronics seems like magic!

    Commercial, and particularly visual sci-fi (TV and film as opposed to printed novels) is notoriously fickle. Look at the main, big spacecraft control room in 2001 compared to the one in 2010. It looks like while the storyline advanced 10 years, spacecraft control systems regressed 50 years...
  13. AnalogKid

    Electronics seems like magic!

    Some are, some aren't. What are your expectations based on? Grand sweeping generalizations about technology almost always are incorrect. (Ahhh - but what about grand sweeping generalizations about grand, sweeping generalizations - ?) ak
  14. AnalogKid

    Electronics seems like magic!

    Would you be less disappointed to find out it's only 1 to 5 years behind? ak
  15. AnalogKid

    Electronics seems like magic!

    Einstein, like Edison, had an excellent and very visual imagination. This was a limitation for both of them; if they couldn't imagine it, then didn't have the math skills (or in Edison's case, science training) to understand it. Einstein could not "see" or "get" quantum mechanics, and in this...
  16. AnalogKid

    Electronics seems like magic!

    The constancy of the speed of light is not covered in the equations you show, which were BTW *not* Maxwell's. In 1884, Oliver Heaviside took Maxwell's work, something like 18 equations with 21 variables, condensed and combined some things, and cooked them down to the four equations you show...
  17. AnalogKid

    Electronics seems like magic!

    1. Not sure what you mean by "purer". Over-the-air broadcasts can have several different resolutions, although there is a lower limit that internet videos often are way below. 2. Broadcast is no more or less free than internet. Both are supported by advertising, and the cost of that...
  18. AnalogKid

    Basic - Ultra bright strobe or flashing LED module?

    1. How Bright? 2. Operating time between battery charges / changes? How long might the circuit be required to flash (not just sit waiting to be triggered)? 3. Do you want to build a circuit from scratch, or assemble pre-wired modules? ak
  19. AnalogKid

    Electronics seems like magic!

    First, a correction > the sense you speak of is not at all common. Imagine a meeting of artists. 10 artists, each with an easel, canvas, a palette. Sitting on a chair is a model. Now expand the group to 1000. Now expand the group to 1 million. Only one of them is going to paint the Mona...
  20. AnalogKid

    Electronics seems like magic!

    Nope. Dead on. If you are both focused and crazy, a billion-transistor microprocessor can be built with nothing but a lot (!!!) of NAND gates. ak
Top