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  1. hevans1944

    Ancient Best 10KVA UPS

    So you are left with reverse engineering the UPS. Is that within your skill set?
  2. hevans1944

    Advice on antifreeze heater?

    Okay, that may be closer to what's going on, but it isn't the whole story. Some of those terribly inconvenienced electrons forced to journey through the lamp filament just transfer their energy to molecular vibrations represented by phonons. This is heat transferred to nearby objects or created...
  3. hevans1944

    Ancient Best 10KVA UPS

    There is an online user's manual available here, but no schematics. Suggest you try to contact the manufacturer, Best Power, a subdivision of SPX Industries which has apparently been absorbed by Eaton. Here is a web page from Eaton that allows you download a PDF copy of the user's manual. Eaton...
  4. hevans1944

    SAY WHAT!?!?!?!?

    We pick up a 26-foot truck at 7:00 AM on Friday, December 9, 2016. Begin 1000+ mile drive to Florida the next week.:D
  5. hevans1944

    Why don't I get a Sine wave?

    I am sure the OP has long fled this scene. Anyone who takes as gospel anything found on the Internet without further confirming research or actual experience has a LOT to learn. And perhaps even more to "un-learn".:rolleyes:
  6. hevans1944

    Advice on antifreeze heater?

    Nope. Even the light is eventually converted to heat when it is absorbed by the surroundings.
  7. hevans1944

    Advice on antifreeze heater?

    You are overthinking this. ALL the electrical energy supplied to a filament lamp is converted to heat. The light output, too. In fact, most of the electrical energy is converted directly to heat and only a very small percentage appears in the form of light from the incandescent filament. You...
  8. hevans1944

    Why don't I get a Sine wave?

    I will agree with that. For some reason, it took me years to understand the concept of pointers in C programming. I still "feel uncomfortable" using indirect addressing even in assembler programming. Apparently I am not very good at abstracting. So, to answer the OP's original question, "Why...
  9. hevans1944

    ZNR

    I am gonna bet the OP simply left the caps lock key on their keyboard turned on. Hokum's Razor. Or Occam's Razor for pedants.
  10. hevans1944

    SAY WHAT!?!?!?!?

    That's standard mains here in North America too, but the pole pig (distribution transformer on a pole outside the house) splits it into two "live" terminals and a center-tapped neutral. And I prefer Florida to Europe, from which my ancestors escaped hundreds of years ago. Nice place to visit...
  11. hevans1944

    What did my graphs change to measuring when i added in the second signal generator?

    You are over-driving the op-amp. Try increasing the value of the 10 Ω resistor and/or decreasing the amplitude of the 500 Hz source.
  12. hevans1944

    Wire an Enforcer retro-reflective photoelectric beam sensor to a siren

    Visit this page and then tell us what you actually have.
  13. hevans1944

    Need help with RF

    That's not much of an explanation. Where are the two switches located? How far apart are they? Who or what actuates and deactuates the two switches? How far is the transmitter from (presumably) a receiver in the car? This could be a job for a PIC connected to the car receiver to control the...
  14. hevans1944

    SAY WHAT!?!?!?!?

    Yeah, however it would violate the National Electric Code to do so. Plugging into an electric dryer outlet seems to be the safest bet, since those have common-trip circuit breakers with the handles tied together for each of two "hot" lines. I would also make sure the 25-foot (or longer)...
  15. hevans1944

    How does a 110v portable generator with brushes generate electricity?

    Good point, Steve! Still, hijacking threads is a time-honored tradition here on EP.:D
  16. hevans1944

    Why don't I get a Sine wave?

    Maybe @Ian can fix the image retention problem. The image I saw in the first post is now gone. mod: see here for the (fixed) circuit.
  17. hevans1944

    Why don't I get a Sine wave?

    I made a copy. Can you see it? U1 is an RC square-wave oscillator, U2 is a unity-gain inverting buffer, and U3 is the so-called "integrator" or low-pass fllter or magic sine wave converter. mod: see here for the (fixed) circuit.
  18. hevans1944

    How does a 110v portable generator with brushes generate electricity?

    What a wonderful story, @globecollector! It appears you and I think very much alike vis a vis trying to get inside the original designer's head. I especially enjoyed how you analyzed and "fixed" the 12V/5V CMOS interface problem created by having two different designers responsible for two...
  19. hevans1944

    Why don't I get a Sine wave?

    It's there. Here is the quote: "Further more, when the input is triangular, the output waveform is also sinusoidal. This then forms the basis of a Active Low Pass Filter ..." And of course it isn't true. The OP has taken misinformation and now wonders why his simulation doesn't produce sine...
  20. hevans1944

    Looking to create a new device

    Is this a Bitcoin application?
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