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  1. hevans1944

    50w rms into 8 ohm load amplifier circuit using single dc power supply

    Well, if you are in the somewhat fortunate position of designing something that will be replicated in million-lot or greater quantities (cell phones come to mind), you really do need to. Recalls (like paybacks) are really expensive.
  2. hevans1944

    50w rms into 8 ohm load amplifier circuit using single dc power supply

    Back in the late 1960s, when I was taking an electrical engineering course in circuit analysis and design, we were introduced to the concept of Monte Carlo Analysis. Our software tools were limited then. I had time-shared access, as well as punched-card batch-program access, to an RCA Spectra 70...
  3. hevans1944

    50w rms into 8 ohm load amplifier circuit using single dc power supply

    Ya hafta wonder if they even know about Monte Carlo variation of parameters to create a design tolerant of parts variations. Since a lot of the folks "over there" do circuit modeling in software, you would think it would a natural thing to perform a Monte Carlo analysis before committing a...
  4. hevans1944

    Audio amplifier to amplify a load cell signal

    @WHONOES: Please note (1) this thread is more than two years old; (2) the original poster, @macabnv, only made one uninformative response in this thread after their initial post; and (3) they haven't been seen in this forum since September 8, 2016. Methinks either the thread is dead or the OP's...
  5. hevans1944

    what do I have here?

    Looks like the one in the video except for the octal base instead of wire leads. Would guess it resonates somewhere between 10 and 20 kHz if the video version resonates at 18 kHz. There is another link in the explanation accompanying the You-Tube video.
  6. hevans1944

    When did EP get so fancy?

    We missed you. Hope your studies are going well! It took a few moments, but I think I really like the new format of these forums. Very easy to navigate once you get the "hang" of it. I plan to visit the other websites the new owners sponsor too.
  7. hevans1944

    Amateur (Ham) Radio and RC (Radio Controlled) Flight

    Not really... I haven't had much contact with UD or UDRI (University of Dayton Research Institute) since graduating in 1978 and taking an engineering position at Mead Technology Laboratories in 1979. I did attend a class reunion one year, but since I was a part-time student during my attendance...
  8. hevans1944

    50w rms into 8 ohm load amplifier circuit using single dc power supply

    @WHONOES: The above quote was extracted from a rather lengthy series of comments here, most of which I have not read. Most of the comments I did read exhibited a vast lack of electronics knowledge, but this one was in response to so maybe Pascual noticed the same thing you did. I have no idea...
  9. hevans1944

    Amateur (Ham) Radio and RC (Radio Controlled) Flight

    Amen to that. Collision with a UAV large enough to cross oceans and continents could be fatal to anyone in an airplane carrying human passengers and crew. If it gets to that, and a LOT of rules would have to be amended to allow it, then it would make sense to require UAVs capable of such flights...
  10. hevans1944

    Amateur (Ham) Radio and RC (Radio Controlled) Flight

    Well, there is still the subject of autonomous, or AI (artificial-intelligence) mediated flight. Not sure the hobbyist community is ready for that, but it is on the event horizon, appearing in a drone near you sooner rather than later. The future is beginning to look a bit grim if we human...
  11. hevans1944

    Amateur (Ham) Radio and RC (Radio Controlled) Flight

    Thanks, @VenomBallistics, for joining this thread. Your considerable knowledge and experience with UAVs is much appreciated. I haven't had time yet to visit all the links you provided in your first post of this thread, but I will definitely visit all of them eventually. I started this thread...
  12. hevans1944

    Button with analogue output?

    "Any sufficiently advanced science is indistinguishable from magic." Arthur C. Clarke (b.16 December 1917 – d. 19 March 2008). Some folks who are into magic will say the converse is also true: "Any sufficiently advanced magic is indistinguishable from science," but let's not go there in this...
  13. hevans1944

    Button with analogue output?

    I LOVE vacuum tubes... my entire electronics career began (and ended) working with vacuum tubes. As for "honest organic noise," its really hard to beat the reality of quantum effects, such as the random arrival of electrons traversing "empty space" between electrodes in a vacuum. But what the...
  14. hevans1944

    Button with analogue output?

    Well, of course there are! But here in the 21st Century you might have to custom manufacture your own. There was a (now expired) Kickstarter campaign to produce such buttons, but I can find no evidence that manufacturing actually occurred, beyond the delivery of a few prototypes to supporters of...
  15. hevans1944

    2 Voltage Regulators On A 220V Heating Element

    You were thinking right. It does have a high heat resistance, but high-wattage heating elements will actually melt if heat is not removed during operation. Silicone rubber will only impede the heat removal process. We use a silicone rubber sheet on a shallow baking sheet to cook frozen...
  16. hevans1944

    2 Voltage Regulators On A 220V Heating Element

    Hows-about a link to the actual device you propose to use? A picture may be worth a thousand words, but maybe a hundred words or less, to describe exactly what you expect that contraption to do, would be better in this case. It looks like the device whose image you posted is what @Minder says...
  17. hevans1944

    High power Square wave Signal

    Folks do not usually visit an electronics hobby forum, such as Electronics Point, simply to seek information on where to obtain COTS (commercial off-the-shelf) equipment. The search engine Google does a pretty good job at that. For example, using the search string "amplifier for square wave...
  18. hevans1944

    Amateur (Ham) Radio and RC (Radio Controlled) Flight

    From what I have been reading about flight controllers, the "little black box" that actually "flies" multi-rotor UAVs, autonomous flight is now a standard feature. You just upload a mission profile with GPS way-points and take off. The FPV is there so you can see what's going on, but the actual...
  19. hevans1944

    Amateur (Ham) Radio and RC (Radio Controlled) Flight

    For all practical purposes with FPV flight control: unlimited range. Fly anywhere until power fails, but I envision a small on-board gas turbine engine to provide electrical power for the prop motor(s) and electronics as well as to keep a smallish battery charged. It would be a creative...
  20. hevans1944

    Amateur (Ham) Radio and RC (Radio Controlled) Flight

    Years ago, in the 1950s, I was briefly attracted to the fixed-wing, flying, model aircraft hobby. Back then it was all about balsa wood air-frames, and fabric-covered fuselages, wings, and control surfaces, said fabric painstakingly applied, doped, painted, and affixed with decals before the...
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