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  1. hevans1944

    Flyback transformer?

    What is going on here? It appears to me that @TonyRepairKe has ZERO qualifications to repair any type of electronics, and most especially NO qualifications to repair anything as ancient and sophisticated as a crt television. Most of these are in landfills by now for very good economic reasons...
  2. hevans1944

    ID 8-pin DIP

    Wow! Chinese "quality control" scores again! That said, and with a little help from Google and Google Translate, I found that Foshan Hanyi Electronic Technology Co., Ltd. has several web pages that you can find by using this Google search string: "who is www.hanny.com.cn" and clicking on...
  3. hevans1944

    Question plastic and rubber

    Amen to that sentiment, Bob. And Google is even better at answering the OP's generally vague and hard-hitting questions than even the egg-spurts who hang out here. @gamer87, give Google a try before posting to Electronics Point, especially questions of a non-electronic or non-electrical nature...
  4. hevans1944

    Question plastic and rubber

    Isn't Portuguese the "native" language of Brazil? Maybe @gamer87 could try writing questions in Portuguese and then use Google Translate to get a version recognizable as standard English that could be uploaded here? I am not sure how to access Google Translate for this purpose, but it has given...
  5. hevans1944

    Measure distance to water surface

    Hmmm. @Elainedan0228, how does your "monkey see, monkey do" picture add anything to this discussion? BTW, it appears that the original poster (OP) was a "drive by" who has considered their "problem" solved and has driven on to somewhere else as of October 20, 2018, the same day as their...
  6. hevans1944

    2sci1969

    The 2SC1969 appears to be one of the many RF power transistors used in linear amplifiers to boost power to the antenna in the 27 MHz "Citizen's Band," usually considerably above the "legal limit" allowed. These linear amps were often called "foot warmers" by the long-haul, over-the-road truckers...
  7. hevans1944

    Wind Detecting Circuit

    So, are we gonna hijack this electro-mechanical wind-sensor thingy into a bio-engineering discussion? No problemo! Much of the "new" technology being developed today is a discovery (or a new appreciation) of how "mother nature" has been doing it for years and years. Think of us Humans as sort of...
  8. hevans1944

    Load cell + hx711 = drifting value

    Yes there is, but this is a really ancient thread that was abandoned by the OP almost three years ago (last seen here November 4, 2016). However, those of us who have been responsible for load cell and strain-gauge instrumentation over the past fifty years or so appreciate your efforts. The link...
  9. hevans1944

    Possible switch overload?

    It is likely you will damage either the switch or its indicator LED because the LED in the toggle handle of the switch is designed to work from a 12 VDC automobile electrical supply. This indicator LED probably has a built-in current-limiting resistor to allow the LED to illuminate without...
  10. hevans1944

    Help select suitable Mosfet for driving relay.

    That sounds like an excellent idea! I had forgotten about out discussion vis a vis the counterfeit MAXIM MAX232 back in 2016. Not to hijack this thread, but this topic of counterfeit Asian parts came up in the Flashlight thread when the OP purchased a counterfeit PICkit 3 programming pod for...
  11. hevans1944

    Charge a battery with electromagnetic induction

    This is an open forum, so others here may have a few questions for you, too. I know I have several. What is inductive energy? Why do you think inductive energy is appropriate for recharging a AAA battery, as compared to, for example, electricity? What does your "very-simple device" actually...
  12. hevans1944

    Help select suitable Mosfet for driving relay.

    That was reported in post #11: My response to that was to add comments (in red) inside his quote, which upon review was probably not a good idea. The editor truncates the display of quoted texts unless the reader explicitly expands the displayed text. I suppose this is a "good" idea, since it...
  13. hevans1944

    Help select suitable Mosfet for driving relay.

    Sure, that should work. But DPDT relays in the same form-factor as SPDT are readily available at virtually the same cost. Or do you just happen to have a lot of SPDT relays on-hand and available for use?
  14. hevans1944

    Help select suitable Mosfet for driving relay.

    Your voltages (except for the last one, VBE, look okay, so whatever is causing your transistor to melt down is not obvious. If you measured VBE = 11.97 V, I would expect that to quickly destroy the base-emitter junction and no further "transistor action" would be possible.
  15. hevans1944

    Thermistor question

    Clearly the so-called controllers are (1) not working properly or (2) seriously un-calibrated or (3) both of these. Why not scrap the controllers and start afresh with something off-the-shelf that actually works and has a manufacturer's warranty? Surely your time is more valuable than wasting it...
  16. hevans1944

    Help select suitable Mosfet for driving relay.

    This is really strange: AFAIK it should not happen if the BC337 NPN transistor base is driven hard enough from a digital (NOT ANALOG!) output port bit to cause the collector to emitter voltage to saturate. See @Bluejets post #6 above. At collector-emitter saturation, there should be 0.7 VDC...
  17. hevans1944

    help wiring 3 phase washing machine motor

    Did you not see the warning on the label that says "Do not connect motor to AC line?" And do you know why it says, above that message, "Use motor only with electronic control in original machine?" I agree 101% with your statement. You don't have a clue what you are doing. Of course a person...
  18. hevans1944

    Convert Hoverboard to RC remote control

    So, can we get this project going by purchasing a cheap Hype 1 Hoverboard and hacking it? First thing would be to rip the two halves apart and discard most of the electronics. No need for the balance sensing that keeps this contraption upright, or the weight sensing that imputably controls...
  19. hevans1944

    PWM shielding

    Shielding is a complicated subject, much more complicated than just a cursory examination will reveal. All shielding is based on a simple principle: no electric field can exist inside a closed, conducting surface. The Faraday Cage is the most basic example. A Van de Graaf electrostatic generator...
  20. hevans1944

    PWM shielding

    I am sure they are useful and profitable to the purveyors of such things. For what purpose do you reckon you would purchase and use one? Years ago, when microwave ovens for home use were new on the market, some folks promulgated the theory that some of the ovens leaked "dangerous microwave...
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