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  1. HarryA

    Power supply?

    Greetings from cold Pennsylvania. I am working on a power supply that I took to be dual polarity power supply with variable output. The power supply has three terminals: red for positive, black for negative, and yellow for neutral (?). But on setting the voltage for 10 volts you get 10 volts...
  2. HarryA

    If You're an Engineer

    The part at 19.32 mins. is very true! USB plug is always wrong! If you're an Engineer..
  3. HarryA

    For Sale: Dell Latitude 3340 Laptops Windows 10

    Dell Latitude 3340 Laptop Windows 10 Clean Install NO CHARGER Priced between 50and 40 USD. Shipping is 1 cent but handling is in the order of 11$. There are about 35 of then - some company up graded to better laptops? see: Laptops Goodwill is a charity organization helping folks train for...
  4. HarryA

    For Sale: Tube tester and Hammarlund radio

    GC Electronics Vintage Tube Tester Bidding ends on Aug. 14 https://shopgoodwill.com/item/238420459 Years ago I would loved to have one of these! Vintage Hammarlund HQ-170 Tube Shortwave Receiver Bidding ends on Aug. 11 https://shopgoodwill.com/item/238373131 BEWARE OF THE SHIPPING IT CAN BE...
  5. HarryA

    PCB: Free Manufacturing

    Learn how to design your own circuit boards from scratch" see:https://hackclub.com/onboard/
  6. HarryA

    For Sale: MUSICAL KEYBOARD NECK TIE

    You could be a big hit at the Christmas party! Tie
  7. HarryA

    High Voltage Direct Current

    "Propose new HVDC technology solutions to strengthen the U.S. energy grid." What are the advantages of HVDC? see:https://www.herox.com/hvdcprize?from=explore For numerous other challenges see: https://www.herox.com Select [challenges]
  8. HarryA

    PHP Web Site Counter

    Greetings. I am trying to add a counter to a web page but it is not cooperating! Directions are: place the count.php file and the hitcount.txt file on the server in the same directory as the web page. hitcount.txt file should contain a value like zero. For the include in the web page I use...
  9. HarryA

    Director of Rodent Mitigation

    New York City is looking for "Director of Rodent Mitigation". Must have ... the drive, determination and killer instinct needed to fight the real enemy – New York City’s relentless rat population. See...
  10. HarryA

    For Sale: VNTG Electrometer Series 500

    Also known as a vacuum tube tester from 1941. see: https://shopgoodwill.com/item/154331926 Bidding is over 11/9/2022 so page will be gone after that. The shipping is often quite high in case you are collector of antiques.
  11. HarryA

    Tesla automobiles?

    Greetings from Penn's woods. In regards to Tesla automobiles: https://www.bbc.com/news/technology-59357306 and/or here: https://www.theguardian.com/technology/2021/nov/20/tesla-app-outage-elon-musk-apologises What does the server have to do with accessing ones car? Does that mean you need cell...
  12. HarryA

    Which pole is up?

    While working with unipolar hall-effect senors I checked which face of the bar magnet was the south polar with a compass. The sensor responds to the south magnet but I found that the face that triggered the sensor was the one that the north pointing compass needle pointed to. Looking on...
  13. HarryA

    BBC Micro:Bit?

    Is the BBC Micro:Bit project alive and well? I just saw a book on Amazon.com "Learn the Micro:Bit using the Arduino IDE"...
  14. HarryA

    British Television?

    Greetings from Penn's woods. In Britain I gather one pays a yearly fee on televisions. This goes towards producing programs? My wife just got done watching Father Brown which last only 45 minutes. So there still must be commercials within the programs? What are the fees like on televisions?
  15. HarryA

    Power shutoffs

    If you have solar cells on your roof and you are putting the power onto the grid what happens when the power company shuts off the power as in California? No power for you? If one has an electrical automobile and charged it off the cells one could always steal power from it? Good excuse to buy...
  16. HarryA

    For Sale: Lots of goodies for you

    This site has some interesting goodies: http://www.surplussales.com/homenew.html
  17. HarryA

    For Sale: Motorola Testing Equipment Lot

    If I lived near Detroit I would grab these. They would look impressive on my bench :) They are pickup only - no shipping. Auction ends 1/30/2019 https://www.shopgoodwill.com/Item/63022552 One could buy the lot and sell each on ebay.
  18. HarryA

    Wanted: electrical ferrules

    I just soldered five small wires on the end of transformer leads so I could plug them into a solderless breadboard. It would be great if there are crimpable ferrules that would take the larger wire and the other end fits into the breadboard, The ones in the photo crimp on the small thus they...
  19. HarryA

    Whirligig with LEDs

    Howdy from Penn's woods. In the photo is a whirligig with a double (4 wires) length of LEDs along the edges of the blades (from a ceiling fan). The whirligig has been in operation since December 2015 with the original batteries. The "wing span" is 4 ft/1.2m. The LED circuits has one length...
  20. HarryA

    the twelve days of christmas?

    Greetings from Penn's woods. How would you calculate the number of gifts in the song "The Twelve Days of Christmas" ? I would think it is the sum of gifts+days as gifts goes from 1 to 12 and as days goes from 12 to 1. That is as far as i can get. You do not get any credit unless you show your...
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