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  1. bertus

    4011 IC

    Hello, The following databook will tell you a lot about the CMOS chips: https://archive.org/details/RcaCmosI.c.Databook1983 (I have the real book). Bertus
  2. bertus

    4011 IC

    Hello, You can better use an 4093 in stead of the 4011. The 4093 has a schmitt-trigger inside, that will have a sharp transition. Bertus
  3. bertus

    Questions lithium polymer battery

    Hello, Then read this page: https://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries The temperature and discharge depth do have their influences. Bertus
  4. bertus

    Questions lithium polymer battery

    Hello, The battery university has a lot of information pages: https://batteryuniversity.com/learn/ Here is the page for lithium polymer: https://batteryuniversity.com/learn/article/the_li_polymer_battery_substance_or_hype And a page about the charging of lithium batteries...
  5. bertus

    What did Santa bring you?

    Hello, @BobK , @Harald Kapp , If you are into woodworking , I have found a lot of magazines on The eye: https://the-eye.eu/public/Books/Woodsmith/ Perhaps you will get some ideas from them. Bertus
  6. bertus

    Need help understanding 70.7 Volt Line Audio

    Hello, The wiki has an article: https://en.wikipedia.org/wiki/Constant-voltage_speaker_system Bertus
  7. bertus

    Melody generator

    Hello, What is allowed for the programming? What programming IDE do you use? With microC there is a library for playing sounds: https://pic-microcontroller.com/create-musical-tone-using-pic-code/ Bertus
  8. bertus

    Melody generator

    Hello, Looking at the pic you mention, it has only 28k of flash on board: https://www.microchip.com/wwwproducts/en/PIC16F1939 How would you program a melody in the pic? You would need information on the pitch and duration of the notes to be played. You will need to find a way to "store" your...
  9. bertus

    Transformer replacement !

    Hello, As others said, post some pictures of the primairy and secondairy side. If there are extra connections on the primairy side, it could be the transformer connections can be changed for 120 V. Bertus
  10. bertus

    Melody generator

    Hello, Do you know how the read the pitch and duration of a note? Here is a site with some lessons: https://www.8notes.com/theory/ An other theory page is this one: https://www.earmaster.com/music-theory-online/course-introduction.html Bertus
  11. bertus

    Melody generator

    Hello, There are two pieces that are repeated, I marked the start and end with think red arrows. I also annotated what is played the first and secomd time: Bertus
  12. bertus

    Melody generator

    Hello, Do you know how to read the score you show? There are some repeats and alterations (different endings at the repeats) in there. Here is a link to a poster with some music theory: https://www.reddit.com/user/msuOrange/comments/8lwv4j/save/ Bertus
  13. bertus

    Need help identifying an electronic component

    Hello, Looking at the silver sticker on the part, it must be a progammable device. Without the code inside, you are out of luck. Bertus
  14. bertus

    H BRIDGE FOR DC MOTOR CONTROL

    Hello, Your image on the google drive does not show. I also see that you already posted your question on the AAC forum, using an hyjack, that has been split off: https://forum.allaboutcircuits.com/threads/h-bridge-heating-problem.166078/ Here is the image taken from that thread: Are the...
  15. bertus

    Fuse rating for electric car heating system?

    Hello, Here I got some pages with fuses that look like yours. It is an copy of the pages 48 and 49 from the following book in the link: http://www.jabse.com/dl2.php?file=Ly4gRWxlY3Ryb25pYyBDb21wb25lbnRzIERhdGFzaGVldHMvRnVzZSBCaWJsZSBDb21wbGV0ZSBHdWlkZS5wZGY= Bertus
  16. bertus

    Comedy Thread

    CIA – Computer Industry Acronyms CD-ROM: Consumer Device, Rendered Obsolete in Months PCMCIA: People Can’t Memorize Computer Industry Acronyms ISDN: It Still Does Nothing SCSI: System Can’t See It MIPS: Meaningless Indication of Processor Speed DOS: Defunct Operating System WINDOWS: Will...
  17. bertus

    New project - 1967 oscilloscope restoration

    Hello, That certainly looks like clipping on the lower side. Bertus
  18. bertus

    DVDR 985 not playing the NTSC recorded DVDs

    Hello, Perhaps this book might help: http://www.jabse.com/Ly4gVmFyaW91cy9EVkQgUExBWUVSIFJFUEFJUiBHVUlERS9EVkQgUGxheWVyIFJlcGFpciBHdWlkZS5wZGY= Bertus
  19. bertus

    Comedy Thread

  20. bertus

    PAL vs NTSC?

    Hello, When you look at the give page, you will see that PAL has a videobandwidth of 5 Mhz and NTSC 4.2 Mhz. Bertus
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