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  1. bertus

    Electronics Hobby Magazines

    Hello, For electronic projects, you could also have a look at our partner site Maker.pro: https://maker.pro/ Bertus
  2. bertus

    Electronics Hobby Magazines

    Hello, The internet archive has a collection of magazines: https://archive.org/search.php?query=electronics+magazine+rack&and[]=mediatype%3A%22collection%22 Bertus
  3. bertus

    Creating an alphabetized list

    Hello, Have a look here: https://notepad-plus-plus.org/ Bertus
  4. bertus

    Electronics Hobby Magazines

    Hello, Did you have a look at the collection I posted at All About Circuits: Library of old books, magazines and textbooks Bertus
  5. bertus

    VOLTAGE REDUCTION TO OPTIMISE STEP DOWN TRANSFORMER

    Hello, @Mver40 , A resistor may not be the best solution. The voltage after the resistor will vary with variations in the load. Bertus
  6. bertus

    For Sale: Large Resistor - TH & SM Components FS

    Hello, @shrtrnd , An IP check gives USA. Bertus
  7. bertus

    Question capacitor

    Hello, Have a look at these pages: https://www.qsl.net/g3oou/reform.html https://www.badcaps.net/forum/showthread.php?t=50530 Bertus
  8. bertus

    Mains LED fairy light - PWM dimmer

    Hello, The leds seem to work on 31 Volts AC. From the given page in post #1 : Output Voltage: 31 V Light Lighting Technology: LED Occasion: Christmas, Multipurpose, Party, Wedding Installation Voltage: AC 31V/220V(UK Plug) Bertus
  9. bertus

    Creating an alphabetized list

    Hello, As @Nanren888 said, using a spreadsheet, called calc in libre office, could be done. You could make several tabs for the catagories. You can download libreoffice here: https://www.libreoffice.org/ It is totaly free and very good ( in my opinion ). You could also make a real database...
  10. bertus

    Electrical Circuits

    Hello, I have made some space on the pages. You could use a paint-like program to add text boxes in the pages with the answers: Bertus
  11. bertus

    Please help an absolute beginners with LEDs

    Hello, As @Nanren888 said, the leds have a common + 5 Volts: Bertus
  12. bertus

    Old 'travel adapters'...

    Hello, There are a couple more in this old advertisement: Bertus
  13. bertus

    P=I^2R formula confusion from book

    Hello, Have a look at Ohms Wheel: Also have a read here: https://electricianapprenticehq.com/basic-ohms-law-formulas/ Bertus
  14. bertus

    Another Tektronix 2235 troubleshooting.

    Hello, A better version of the service manual can be downloaded here: http://sageskye.homeserver.com/tektronix_2235_service_manual.pdf It has a complete schematic of the power supply inside. (see attachment, I also added a PDF version that can be zoomed better). Bertus
  15. bertus

    Another Tektronix 2235 troubleshooting.

    Hello, Smoke coming from the instrument sounds bad. There must be something burned inside. It is likely in the powersupply section. Have a look at the Service Manual. It can be downloaded here: http://www.jabse.com/L1Rla3Ryb25peC8yMjM1 Bertus
  16. bertus

    Problem with making inverter

    Hello, You can calculate the timing of the chip: Use the free running line of the table Bertus
  17. bertus

    Problem with making inverter

    Hello, At about 50 Hz, the leds will look like both are on as they are switched to fast to see them blinking. Did you wire the transformer correctly? Is it a transformer with two separate coils? The connect it as : (Drain Q1 to 12V first coil) , (0V first coil to12V second coil to + 12 V...
  18. bertus

    Transformer wiring

    Hello, You will need to watch the phase of the two coils. This image from the ILP transformer datasheet shows a dot for the start of the coils: Keep in mind that the colors apply for the ILP transformers. Try to get a datasheet for your transformer to get the correct connections. Some...
  19. bertus

    Non zero output from LM358 even though input is zero

    Hello, I see you tried to direct link to an image on AllAboutCircuits, from this thread: https://forum.allaboutcircuits.com/threads/non-zero-output-from-lm358-even-though-input-is-zero.181971/ AAC does not show images on other sites as a login is needed to show the image. I copied the image and...
  20. bertus

    Problem with making inverter

    Hello, Did you connect the mosfets correct? Bertus
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