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  1. hevans1944

    pls help need to pass for my finals

    Well, here it is May and we still haven't heard any more from @mothman. In most places this is graduation season, so unless she somehow pulls a miracle from somewhere and passes her "final" it looks like this thread is done.
  2. hevans1944

    pls help need to pass for my finals

    We can help you if you do some work yourself. Show us what you do know and perhaps we can move you a little further along. This forum is not a one-stop shop for answers.
  3. hevans1944

    Best way to put off Fire from a Mobile Robot

    This is an ideal application for an AI-equipped robot. Make sure it has access to a fire hose and can manipulate the hose, nozzle, and water valve. Carrying a fire extinguisher around is not a practical solution. Try to get some practical experience from your local fire department on how to...
  4. hevans1944

    Newby question - Yaesu FT-757gx

    @TVRChris: please tell us your amateur radio call sign. 73, Hop AC8NS
  5. hevans1944

    How to reduce IR sensitivity for can trash

    Trash cans, especially if used in the kitchen to dispose food, absolutely need a lid to prevent houseflies from laying eggs and procreating more flies on the rotting food (if someone forgets to take the trash out daily). My wife has a compromised immune system (Lupus), so I have to try to...
  6. hevans1944

    Assistance Identifying component L2

    I sometimes rig a current source to force current through a suspected component (removed from the circuit of course) and then measure the voltage drop across it with my multimeter, You can purchase an inexpensive RLC measuring kit from Asia for a few bucks to measure inductance.
  7. hevans1944

    pls help need to pass for my finals

    Addendum: If you are going to use just ONE button to change the state of a flip-flop, don't forget to de-bouince the switch before applying the logic state of the switch to the clock input of the flip-flop.
  8. hevans1944

    pls help need to pass for my finals

    Timothy has responded like an AI to the suggestion by @Harald Kapp to use a two-button set of switches to operate the servo configured to operate as a door lock... or any other sort of lock. This may of course simply be a communication problem as @mothman learns more English. It does seem as if...
  9. hevans1944

    HELP! Issues with Lighter Heating Coil

    This is a very old topic. Vape pens and e-cigarettes are popular, and smokers wanting to make their own "vapes" are numerous. I began vaping many years ago as an alternative to smoking real cigarettes, but the cost of the vape pen was minor compared to the cost of purchasing something to vape...
  10. hevans1944

    Not sure what sensor to use

    I like this concept, but you would still need three itsy bitsy teeny weeny accelerometers to measure the orientation of the twelve-sided die. So, add a CPU and a Bluetooth transceiver and, voila! You now have an expensive RPG die with no need for three tuned "antenna" circuits. I have been...
  11. 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...
  12. 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...
  13. 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...
  14. 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...
  15. 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...
  16. 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...
  17. 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...
  18. 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...
  19. 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...
  20. 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...
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