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  1. hevans1944

    Year 2038 problem.

    I am hoping for a medical revolution: replacement organs grown from my own stem cells; self-replicating nanobots with a limited lifetime to circulate through my bloodstream, making sure the capillaries stay clean and healthy while removing and disposing of the goop on my arterial walls and...
  2. hevans1944

    How to reduce IR sensitivity for can trash

    It wasn't explicitly stated, but I think @kellys_eye hit the nail on the head: why do we need an infrared sensing, wave your hand at it, garbage can? In our guest bathroom we have one of those old-fashioned small cans, into which we dispose bathroom tissues and whatnot into a liner made from a...
  3. hevans1944

    Trolling

    I just now stumbled onto this thread. I may actually have tripped and fallen over a troll to get here. Nevermind. I tend to follow the logic of @kellys_eye on this, and many of the moderators may too. We all know, or think we know, at least one troll. It is difficult to get rid of them, but...
  4. hevans1944

    Year 2038 problem.

    My co-morbidity factors are not promising: left and right heart failure, atrial fibrillation controlled by a pacemaker/defibrillator implanted in my chest, arteries clogged because of years of poor diet causing arterial dementia, type 2 diabetes, a history of cancer in my immediate family. There...
  5. hevans1944

    LC oscillator and resonance frequency

    Huh? Did this fascinating thread, started by our European friend, die? I thought we were just getting started here on "feeling" how electronics work. I "feel" that transient responses are interesting and extremely difficult to understand, even with mathematics to help. BTW, only in mathematics...
  6. hevans1944

    Year 2038 problem.

    At my age, I often forget what day of the week or what month it is. This problem is scheduled to resolve itself with my death. A mind may be a terrible thing to waste, but it is evil to not remember when certain important-to-me things, that occurred some time in the past, actually happened...
  7. hevans1944

    Help wiring vintage record player speaker

    Many years ago, I ran across a similar arrangement of a loudspeaker with a paper cone diaphragm attached to a voice-coil that was inserted over the pole piece whose magnetic field was created by an electromagnet, whose two pole pieces surround the voice-coil. The image the OP attached fits this...
  8. hevans1944

    Home Based Income as an Electronics Hobbyist

    It is easy to transmit Morse Code faster than you can reliably receive it. Among radio amateurs this is considered to be bad practice, and may earn you the moniker of being a "lid," which is ham-speak referring to an incompetent operator. One should adjust their sending speed to whatever speed...
  9. hevans1944

    Home Based Income as an Electronics Hobbyist

    I just recently found out that there are TWO Morse codes still commonly in use. One is known, perhaps colloquially, as "railroad Morse" and the other is the familiar International Morse used by amateur radio operators or hams. I used to love sending and receiving International Morse Code as a...
  10. hevans1944

    Home Based Income as an Electronics Hobbyist

    This is an absolutely true statement, but it doesn't guarantee success to love your work... a certain amount of skill and ability to perform the task at hand is also part of the "formula for success." But why work your life away doing something you don't love? Move up or move out, but don't...
  11. hevans1944

    Home Based Income as an Electronics Hobbyist

    I didn't want to get into a discussion of "Makers" versus everyone else, especially here in the MakerPro forums. Makers make things, and most makers probably don't care to know why the things they make work, if indeed they do work. I have been "playing" with electronics for a very long time, but...
  12. hevans1944

    Home Based Income as an Electronics Hobbyist

    That has been a pet peeve of mine for a long time. I call that kind of "maker" a "poser" and will call them out the instant they start to spew forth their electro-bable explanations. I can certainly appreciate your frustration if you have ever tried to communicate with a poser trying to be a...
  13. hevans1944

    Absolute Pressure Sensor For SPL Metering

    @bertus: Thank you for the wonderful link. This brought back a lot of memories from the 1970s when electrets were first being used as temperature sensors. I was fortunate to be able to "play" with the early electrets, but lost interest after a few years and moved on to other projects. The author...
  14. hevans1944

    Absolute Pressure Sensor For SPL Metering

    More likely we would be speaking Russian. I tried learning German in high school and in my first year in college. Unsuccessful. Then I tried learning Morse Code and found that my brain doesn't "hear" foreign languages easily. I did eventually learn to send and receive code at around twenty words...
  15. hevans1944

    Absolute Pressure Sensor For SPL Metering

    WTF is a meme that appears to be popular right now. I do have some idea of what it means: World Trade Federation, perhaps? Or, What's That Fellow? It is sort of like using BUFF to refer to B-52 bombers. When I was in the service, I was told that BUFF meant "Big Ugly Fat Fucker" but later...
  16. hevans1944

    LC oscillator and resonance frequency

    I did find it interesting, especially since the author included graphs with the written explanations. What I didn't like was the anthropomorphism attributed to inanimate capacitors and inductors. I must confess that, while interesting to read, the article did not improve or correct my...
  17. hevans1944

    Absolute Pressure Sensor For SPL Metering

    The Russian device the OP linked to is quite expensive. @Movox didn't provide any specifications other than what is described in the link, so perhaps something like this Radio Shack (Realistic) Sound Level Meter would work. I got mine at a second-hand store here in Florida, but they may still be...
  18. hevans1944

    Not sure what sensor to use

    Just now discovered this thread... interesting that what the OP requests is already available on the open market... just not in the form that was requested. I guess I sort of agree with @Harald Kapp (and @kellys_eye and @Martaine2005) about @Delta Prime's presentation persona here on Maker Pro...
  19. hevans1944

    restoring old garage door opener-receiver/transmitter

    I have worked with other folks (not this crew!) who believed that intermittent problems, like this one appears to be, were simply resolved by hitting the object in question with a bigger hammer. Hmmm. If simple visual inspection fixed the problem, we may have a quantum mechanical situation...
  20. hevans1944

    What is the optimal design for loop antenna made of copper stiff wire to transmit at 81.39–90.00 kHz?

    I wouldn't count too many of my chickens until you actually see their eggs hatch. This article may shed some light on what Delta Prime is betting the future of wireless battery charging on. The research is old, and there have been no earth-shaking YouTube videos posted lately on its practical...
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