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  1. bertus

    I would like to power a table radio with 12V DC instead of 110V AC

    Hello, Looking at the page, the used battery seems to be 9 Volts. Are there 6 C or D type batteries in the battery compartiment? Bertus
  2. bertus

    I would like to power a table radio with 12V DC instead of 110V AC

    Hello, What model do you have? There seem to be quite some around: GE Superradio Bertus
  3. bertus

    Generator/Inverter repair

    Hello, You can attach pictures using the Upload a File button. Keep the size of the pictures around 300 kB, and you will be fine. Here is a page to visual inspect capacitors on possible failure: https://www.robotroom.com/Faulty-Capacitors-1.html Bertus
  4. bertus

    Book Reviews

    Hello, Here are more free books on the internet archive: https://archive.org/details/opensource?query=electronics&sort=-publicdate&and[]=mediatype%3A%22texts%22&and[]=languageSorter%3A%22English%22 Bertus
  5. bertus

    Current design of amplifier VAS

    Hello, I noticed that the article is written by Douglas Self. He also wrote a book, that is now available at the Internet Archive: https://archive.org/details/fe_Audio_Electronics_Transistor_Amplifiers_Design_Handbook_D._Self Bertus
  6. bertus

    Current design of amplifier VAS

    Hello, Read the following article: https://www.edn.com/distortion-in-power-amplifiers-part-iii-the-voltage-amplifier-stage/ Bertus
  7. bertus

    LEDs & Hall Effect Switch Circuit Advice Please!

    Hello, The forward voltage of a led depends on the color. Have a look at this chart: Also the forward voltage is dependend on the current: Bertus
  8. bertus

    Book Reviews

    Hello, Here are some old radio shack comics about electronics: https://archive.org/download/ElectronicsSpaceShuttle1982RadioShackpdf/Electronics-The Discovery That Changed the World (1978)(Radio Shack).pdf https://archive.org/download/ElectronicsSpaceShuttle1982RadioShackpdf/Electronics-Space...
  9. bertus

    Identifying correct LED replacement

    Hello, What is the size of the led? There are many leds around: white smd led Bertus
  10. bertus

    Marantz 2230B with Weak FM

    Hello, As @ramussons said, there could be a problem with the stereo decoder. Here is the decode schematic: Check the parts connected to pin 14 of the HA1156. See the datasheet for more info. Bertus
  11. bertus

    Problem video of board PC

    Hello, The following page shows the full specs: https://www.lg.com/ae/consumer-monitors/lg-19M37A Resolution : 1366 X 768 Analog / H-Frequency : 30~61kHz Analog / V-Frequency : 56~75Hz Try to find settings in the windows settings that meet these. Bertus
  12. bertus

    Problem video of board PC

    Hello, How are the video settings of the videocard? Perhaps the converter can not handle the videosettings. Bertus
  13. bertus

    Build a variable power supply

    Hello, The 7825 DOES NOT EXIST: Bertus
  14. bertus

    Troubleshooting a High Power Relay H Bridge

    Hello, I have reduced you 60 MB image to an image off about 300 kB: There is a lot of white space and the lines are crossing and bending a lot. Bertus
  15. bertus

    Buck Converter Clarification

    Hello, Have a look at the following page and the attached PDF. https://www.richtek.com/Design%20Support/Technical%20Document/AN041?sc_lang=en Bertus
  16. bertus

    Add one resistor to give bipolar LM555 oscillator a 50:50 duty cycle

    Hello, Here is a "printerfriendly" page: https://www.printfriendly.com/p/g/PBJWVy I hope it works. bertus
  17. bertus

    Networks Of Multivibrators

    Hello, Have a look at this post on AllAboutCircuits: https://forum.allaboutcircuits.com/threads/leds-555s-flashers-and-light-chasers.19075/post-117644 bertus
  18. bertus

    Can You Identify This?

    Hello, I have several times seen that those tantalium capacitors where burnt and created a short on the board. Bertus
  19. bertus

    Multimeter DIY test leads gauge

    Hello, The gauge size to use depends on the maximum current. I would take the leads that are the thickest. Also I would recomend using silicon isolation, as that is most likely more flexible and more heat resistant. Perhaps these would do...
  20. bertus

    No scanning scanner

    Hello, Did you see this in the manual, about the lockout function: Bertus
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