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  1. bertus

    Book Reviews

    Hello, There is a bookshelf for some old books on Worldradiohistory: https://worldradiohistory.com/BOOKSHELF-ARH/Bookshelf_Hobbyist.htm There are also many "specials" on the same site: https://worldradiohistory.com/Hobbyist_Special_Editions.htm Bertus
  2. bertus

    How come these alligator clips only transfer electricity when swapped at the battery terminals?

    Hello, To check if there is a diode in the plug, you could measure from the plug to the connector both ways on the inner contect and the outer contact using the diode check of the DMM.\ Perhaps the diode is in there to make the circuit "fool" prove. Bertus
  3. bertus

    Changing Calling cell# via keypad RFK5501 on DSC 1832 alarm

    Hello, I have changed the title as @ChosunOne recommended. Bertus
  4. bertus

    Will a voltage divider waste power?

    Hello, A voltage divider WILL waste power. Any resistor that drops a voltage will waste power. Bertus
  5. bertus

    And now something weird

    Brazilian ballerina born without arms soars with her attitude
  6. bertus

    Comedy Thread

    Found at AAC:
  7. bertus

    And now something weird

    Boy almost died when he swallowed 54 magnets to see if he could become magnetic Read more: https://metro.co.uk/2021/02/08/boy-12-has-six-hours-of-life-saving-surgery-after-swallowing-54-magnets-14043798/?ito=socialmetrouktwitter?ito=cbshare
  8. bertus

    Help - Mystery Outlet! Photos & Video

    Hello, The following page will tell you more about the wire colors in an electrical system: https://www.electricaltechnology.org/2020/07/electrical-wiring-color-codes-nec-iec.html Bertus
  9. bertus

    Woo-Woo passive amplification using an lc oscillator

    Hello, Have a look at the following (old) book: Magnetic Amplifiers, Paul Mali, 1960, 101 pages - Thanks to Keith Carlsen! Vacuum tubes aren't the only way to make an amplifier? This book is about magnetic amplifiers, which use the nonlinear saturation characteristics of a core to create an...
  10. bertus

    Woo-Woo passive amplification using an lc oscillator

    Hello, Where will the energy come from for the oscillation? It will never begin on its own. Bertus
  11. bertus

    And now something weird

    Frozen bubble:
  12. bertus

    Woo-Woo passive amplification using an lc oscillator

    Hello, It will never work: How would the resonant circuit be exitated? Bertus
  13. bertus

    Comedy Thread

  14. bertus

    Reebok RB1000 Exercise Bike - Discharging batteries in days

    Hello, I see some more details on the pictures that leave questions: bertus
  15. bertus

    And now something weird

    Katfilter in zoom meeting:
  16. bertus

    Old magazine series 99 IC projects

    Hello, @TCSC47 , You might want to have a look at this page for some old books: https://worldradiohistory.com/BOOKSHELF-ARH/Bookshelf_Hobbyist.htm There are also many "specials" on the same site: https://worldradiohistory.com/Hobbyist_Special_Editions.htm Bertus
  17. bertus

    And now something weird

    Snowart? Got the name from this page: https://www.ad.nl/video/kanalen/buitenlands-nieuws~c401/series/snel-nieuws~s921/finse-kunstenaar-maakt-gigantisch-kunstwerk-in-de-sneeuw~p196883
  18. bertus

    Comedy Thread

    How about some electronic parts sculpture: https://www.rfcafe.com/miscellany/cool-pics/electronic-component-sculptures.htm Bertus
  19. bertus

    Comedy Thread

    Found at AAC:
  20. bertus

    Tek 465 5v Rail Issue

    Hello, When the rectifier gets so hot that it unsolders, there must be a short somewhere. Does the PCB have tantalium capacitors mounted? I have many times seen them create a short. Bertus
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