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  1. hevans1944

    Smartphone interfacing with Audio Amplifier and External Speakers.

    You bet it will! I have an iPhone 6 that I inherited from my wife after she upgraded to an iPhone 7 last year. We also have a rather large Yamaha receiver/amplifier and surround-sound Klipsch Quintet speaker system that we purchased to improve the sound quality of our Samsung flat-screen TV...
  2. hevans1944

    Hello People!

    Hi, Niraj! Welcome to EP! This can be a great place to learn new things about electronics, but we expect you to do most of the work. Just like school, except there are no grades, no deadlines! You learn at your own pace. If you want to really learn electronics, instead of learning about...
  3. hevans1944

    What is a capacitor?

    A capacitor is two conductors separated by a dielectric. It is used to store electrical energy in the electrical field between the two conductors. Suggest you begin your learning quest here instead of on EP.
  4. hevans1944

    LED light: 120V and 25watts vs 12Volts and 25 watts: whats the difference?

    Geez... I KNOW you know better than this completely wrong statement.
  5. hevans1944

    9 way clap switch

    Sure does! After visiting the link you posted, why would the OP need any help from us here on EP? I hope he appreciates your link as the solution to all his problems.
  6. hevans1944

    9 way clap switch

    Good for you! Mmmm... what is a 9 way clap switch circuit? Does this mean your design is <gasp!> defective? It appears there are three LEDs on your breadboard and two of them are illuminated for some reason. Are you hoping to get LED flashes on clapping from the third (dark) LED? What does this...
  7. hevans1944

    LED light: 120V and 25watts vs 12Volts and 25 watts: whats the difference?

    It is really hard to compare the two LED strings when you don't provide ANY information other than power and voltage requirements and the length of the strip. Post links to each of the two products and upload pictures and manufacturer's suggested wiring diagrams. Don't make us jump through your...
  8. hevans1944

    Making a Pulsing/Fading LED Circuit

    That circuit IS NOT what I would recommend, especially if you have an Arduino Uno handy to play with. The curvy saw-tooth waveform is horribly inefficient and most of the power is wasted as heat in the transistor. This circuit cannot be easily expanded to drive more than one or two LEDs. First...
  9. hevans1944

    Making a Pulsing/Fading LED Circuit

    Depends on how far "off topic" the thread wanders. Sometimes the original poster (OP) leaves (or never participates) in the discussion that follows their initial query. Then you can see a back and forth exchange of posts as we try to figure out what the original question was about. It soon...
  10. hevans1944

    Searching for the perfect lcd display

    Maybe for a heads-up virtual reality display?
  11. hevans1944

    Making a Pulsing/Fading LED Circuit

    Yep. Dad went to a G.E.M (Government Employees Mart) department store in Houston, TX when I was about seven or eight years old, living in Lake Charles, LA where Dad was a bombardier/navigator on B-47 bombers. He bought a Royal Portable Typewriter with an integrated case. There were four levers...
  12. hevans1944

    CO2 laser tube lifespan - time used vs age of tube?

    No argument from me on the convenience of this.The key is the inexpensive, infrared transparent, optical "beam splitter" or "combining" element. If you have one of these, there is no reason NOT to use it to create a co-axial alignment beam. A kinematic mount is unnecessary when the combiner...
  13. hevans1944

    CO2 laser tube lifespan - time used vs age of tube?

    IMO, you don't really need (and should not want) a beam combiner. As you noted, many (actually, most) infrared transparent materials are optically opaque in the visible wavelengths, so a combined infrared and visible beam would not pass through these materials. As long as the path from the...
  14. hevans1944

    CO2 laser tube lifespan - time used vs age of tube?

    Strongly recommend you take precautions to safely enclose a 40 watt 10.6 μm infrared laser beam. MUST prevent specular reflections from metallic surfaces, or at least absorb such reflections. Back in the day, when I was actively "playing" with small desktop Sylvania five-watt CO2 lasers, we...
  15. hevans1944

    CO2 laser tube lifespan - time used vs age of tube?

    Please let us know how that works out for you, Ian. Hop
  16. hevans1944

    For Sale: Vintage Silver Mica Molded Capacitors

    The only folks interested in buying vintage components are those who are restoring vintage equipment, and those who want to preserve, as much as possible, the original authenticity of that equipment. If I were restoring a vintage radio (for example) that used silver mica capacitors like the...
  17. hevans1944

    Converting a PWM wave into pure DC

    Quite likely. This is the same poster who believes all actuators are inductive. Probably not the sharpest knife in the drawer either, if this isn't a language translation problem. Still waiting for a schematic and some sort of explanation of WTF he wants to DO.
  18. hevans1944

    Why are actuators inductive?

    Huh? What do they speak now in Canada, England and Australia? Eh, mate?
  19. hevans1944

    Why are actuators inductive?

    We cannot answer questions that presume inaccurate or wrong premises. Actuators are NOT always inductive, as @BobK pointed out in reply #2. Actuators based on the piezo-electric effect are not inductive.
  20. hevans1944

    Converting a PWM wave into pure DC

    The peak value of PWM wave is CONSTANT. The only thing that varies is the pulse width, and possibly the pulse repetition frequency. Please post either an oscilloscope screen-capture of your "PWM wave," or a hand-drawn sketch showing what kind of wave you want to "convert into pure DC." Your...
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