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  1. hevans1944

    Like New NordicTrack Exercise Bike - Dead Console

    Checking for continuity simply means to check the resistance between two points using the ohmmeter function of your multimeter. If there is a conductor or a measurable resistance between the two points, then there is said to be continuity. OTOH, if the multimeter shows an open circuit between...
  2. hevans1944

    Hooking up deadbolt motor to TB6612FNG Stepper Motor Controller

    Good luck getting any information from @StealthRT. I have read some of the threads to which he posted and noticed that most ended rather abruptly without any significant feedback from him. He is what I call a "drive by" poster, lingering only long enough to get whatever information he needs from...
  3. hevans1944

    Hooking up deadbolt motor to TB6612FNG Stepper Motor Controller

    You (or a Moderator) should start a NEW THREAD for this. Note that the original title of THIS THREAD is "Hooking up deadbolt motor to TB6612FNG Stepper Motor Controller". There is NO MENTION of the ESP8266 ESP-12E WiFi Module until @StealthRT's posts #23 and #24, and then nothing more until your...
  4. hevans1944

    Resistor value

    Spec sheets for electronic parts are intended to be read and understood by electrical engineers. The only thing any led needs is appropriate forward operating current. The forward operating voltage will be supplied by the designer's circuit and may include an appropriate current-limiting...
  5. hevans1944

    Building a circuit [Variac]

    The electrical circuit sounds okay, but the proper way to join (splice) two wires together is either with solder or a crimped barrel connector. You can then cover the splice with shrinkable tubing or wrap it with electrical tape. DO NOT simply wrap the bared ends of the two wires together and...
  6. hevans1944

    Building a circuit [Variac]

    Clearly, @OrangeArav has fallen into the deep end of the pool without wearing a life-jacket and without a life guard in attendance. Two qualified posters, @kellys_eye and @WHONOES have repeatedly warned of the dangers of trying to use a Variac (variable AC autotransformer) to power the circuit...
  7. hevans1944

    In need of some Career Guidance!

    I spent my entire career, after my Air Force enlistment ended in May 1967, until my forced retirement in December 2014, working for United States of America defense contractors. Pay and other compensation (vacation leave, sick leave, stock options, etc.) was usually competitive with industry...
  8. hevans1944

    I have created a Mathematical Construct that will change the way we do maths !

    I thought the binary number system already did that. Just two symbols, "0" and "1" to remember and manipulate. So simple even a computer can do it. No AI necessary.:cool:
  9. hevans1944

    Please excuse total noob query regards seeking storm bad signal effect on sat TV

    What exactly does this look like? Back in the day, weak signals received from analog TV transmissions often appeared as if the images were taken in a snow storm, along with the images weaving sideways or rolling up or down because of loss of sync signals. Sometimes there were multiple images...
  10. hevans1944

    What connector type is this on aerobic septic system control board?

    Hard to tell from pictures, but those look like standard wire-wrap post pins. If so, you might be able to find and disassemble a circuit board IC socket that has compatible-sized female socket receptacles. There are also pre-made jumpers available that mate with wire-wrap pins, so you could...
  11. hevans1944

    3 transistor non-contact mains detector

    Why poo poo it? If it works, use it. These non-contact field sensors are all over the Internet and it sure ain't rocket science. The Arduino/RPi interface is rather obvious, too, to anyone "skilled in the art". The only "problem" I see is sensitivity: either too much or too little and no easy...
  12. hevans1944

    Sensor to activate a handicap door switch

    It would appear that "handicapped" and "wheelchairs" are Red Herrings. The real application is an "add on" means to remotely operate powered doors when approached by the Beam virtual reality "robots" as they wheel about from one location to another. It would probably be a dynamite app if they...
  13. hevans1944

    Sensor to activate a handicap door switch

    Most RFID sensors have a very short range, typically only about an inch or so, nowhere near the 3 feet that @pbesong requested. They are also way overkill for this application in requiring some sort of computer interface, typically an Arduino or Raspberry Pi. Consider instead a wireless key fob...
  14. hevans1944

    Why are there not millions of usable frequencies?

    This is absolutely NOT correct. The human eye-brain system is easily fooled and/or confused by a myriad of optical "illusions" based on color, contrast, and spatial relationships that appear to be "hardwired" into the system. No such limitations are deliberately introduced into radio systems...
  15. hevans1944

    Where can I find Ferric Chloride Hexahydrate in the USA?

    Perhaps you are unacquainted with our friend, Google. Here is a list of links that Google provided me when I typed in the text string (without the quotation marks) "ferric chloride hexahydrate price". If I omit the "price" qualifier, this is the resulting list. And if I choose the Amazon...
  16. hevans1944

    Simple maths resistance exercice

    Close but no cigar. You messed up in the last step, converting two 6Ω resistors which are in series into a 3Ω equivalent resistance. Correct this and then calculate the current again. Power in the original 6Ω resistor is the corrected current squared multiplied by six ohms.
  17. hevans1944

    Simple maths resistance exercice

    Your "answer" isn't even close to being correct. Do you know how two (or more) resistors in series can be replaced with a single equivalent resistance? Do you know how two (or more) resistors in parallel can be replaced with a single equivalent resistance? You must reduce your circuit to a...
  18. hevans1944

    Simple maths resistance exercice

    Sorry, @endlessparadox, we don't roll that way here. You do the exercise, you post the results here, then maybe someone will comment on your work. Do what @Ratch said in his post #4. This is NOT a teaching forum. If you do not know how to apply Ohm's Law and Kirchoff's voltage and current laws...
  19. hevans1944

    74LS245 it doesn't work like i think

    Yeah, I think whatever they are doing was possibly aided by the Whiskey part of the meme. My wife and I never acquired the grace of learning ballroom dancing, although I do admire any couples who are adept. We do like to boogie though, and boogie-woogie dancing is fun too, albeit a bit...
  20. hevans1944

    My Vacation

    Thanks for the memories, @Ratch! My wife, my mother, and three of my children I toured the great American West in 1978 as a reward for my graduation from college after ten long years of part-time study. Carlsbad Caverns in New Mexico, Mesa Verde in Colorado, the Four Corners Monument, Bryce...
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