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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. hevans1944

    Interesting Video On Electricity

    In the 19th century, while electricity was being discovered and used to kick-start the Industrial Revolution, many people thought that something they called the ether was responsible for EM propagation. So Michelson and Morley tried to measure the effect that Earth's motion around the Sun...
  9. hevans1944

    With a Little Help from my friends?

    Theramins are difficult instruments to play. One antenna controls the pitch and the other controls the volume. It takes some fancy hand movements to make the beast sound anything at all like real music. I would like to obtain the skills and software to take images from a USB camera connected to...
  10. hevans1944

    Help

    @danadak: Thanks, Dana, but I don't remember why I wanted an el-cheapo CO2 detector. Maybe to test the carbonation of a Sodastream thingy I have? But thank you for the link to the sensors.
  11. hevans1944

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

    Well, Grasshopper, I am glad you like what @kellys_eye and, perhaps, I have been saying. He appears to have his head screwed on tight, and I like to think that I usually do, too. We disagree in the details. But, please, take the time to read everything. You can use the quoting feature of this...
  12. hevans1944

    Help identifying old lab equipment

    I have something very similar. It believe it is a precision Wheatstone Bridge. The standard cell is used to adjust the current in the bridge by nulling the voltage drop against the standard cell voltage. I keep mine around to remind me of the vast history our hobby enjoys. The wooden case...
  13. hevans1944

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

    Puleeze! The figures I cited as estimates were just that: pulled them straight out of my ass. Thanks for providing some actual (I hope) information. However, I do not share your pessimism concerning battery-powered shipping. It's coming, maybe not "real soon now," but eventually. Battery...
  14. hevans1944

    revolving chandelier with a way to plug in led strips

    Sure, almost anything can be done if you know what you are doing. It seems fairly obvious that you know almost nothing about electricity or electronics. And, in return, we know almost nothing about what you are trying to DO. Does it have something to do with trying to build and hang a rotating...
  15. hevans1944

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

    Yep, microwaves is one way to do it. An old proposal (maybe 50 years old?) was to orbit giant solar photovoltaic panels to harvest energy from the Sun, convert the direct current (millions of amperes) to microwave energy, beam the microwaves down to giant rectifying microwave dipole (rectenna)...
  16. hevans1944

    Toob to transistor conversion

    I briefly knew Kris before he suddenly died at much too young of an age. He was truly remarkable and is much missed in these forums. Kris would answer a question in considerable detail, including an annotated schematic and parts list with his response. And he did it for free! I have never met...
  17. hevans1944

    Toob to transistor conversion

    Please look at the posting date before responding to an ancient thread. The original poster was only seventeen years old and posted here only once. Obviously a "drive by" poster who just wanted a quick answer. When he didn't get it he moved on. Maybe he will see these "recent" posts and respond...
  18. hevans1944

    Artificial Intelligence

    I have been wondering how to approach this subject in an open forum. I am currently in a private conversation here on MakerPro with someone much younger than I am who is interested in AI research. As a (mostly) retired electrical engineer, I find it fascinating that folks are scared of AI. It is...
  19. hevans1944

    I am seeking a builder person/friend. I'm a project manager in my head.

    Please clarify what "a step-phase magnetic array" does, and what it means to you. A DuckDuckGo search revealed this link as the first result of the search. What does it have to do "toward a Star Trek tricorder?" We don't much like to play 20 questions here. I see that not only are you new to...
  20. hevans1944

    Trying to identify what these are

    The point of suggesting that you use AA cells was to allow you to try different voltages while minimizing noise pickup. An adjustable bench power supply is okay of course, unless you experience noise problems. Power supply switching noise can be a common problem for some applications that use a...
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