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  1. bertus

    I need advice please for my disabled son

    Hello, For the board in post #5 the pins have the following functions: GND , Negetive from power supply. VCC , positive from power supply. COM , common contact of output relays. CB , Circuit break contact of relays. CK , Circuit make contact of relays. IN , could be a trigger signal (not...
  2. bertus

    electronic tubes

    Hello, Is there a type number on the box or tube? That way we can see what the specifications are. From page 93 of the posted PDF (page 91 in the book), the specifications of the tubes are shown. Bertus
  3. bertus

    electronic tubes

    Hello, Are you talking about photo tubes? Wich one are you using? When using photo detectors, have a look at the following book: http://bitsavers.org/components/rca/1963_PT-60_RCA_Phototubes_and_Photocells.pdf Bertus
  4. bertus

    What is quality level and reliability of cheap chinese diodes?

    Hello, Have a look at the comments in these threads on All About Circuits: https://forum.allaboutcircuits.com/threads/buying-from-china.158678/ https://forum.allaboutcircuits.com/threads/buy-from-these-ali-express-amazon-sellers-at-your-own-risk.173035/ Bertus
  5. bertus

    How to wind isolation transformer by impedence matching?

    Hello, You already have a thread here: How to wind impedence matching transformer to inverter output? Bertus
  6. bertus

    Ramsey RF kits

    Hello, @kellys_eye , Thanks for the heads up. I just found them. Indeed the schematics are blanked out. I have mentioned the missing schematics in the resource. Bertus
  7. bertus

    Ramsey RF kits

    bertus submitted a new resource: Ramsey RF kits - RF kits Read more about this resource...
  8. bertus

    Ramsey RF kits

    Hello, Here is a page from the internet archive with a lot of Ramsey RF kits: https://archive.org/download/ramsey-electronics-manual Unfortunately the schematic pages are blanked out. Bertus
  9. bertus

    Help needed

    Hello, What is the very low voltage? Has the input voltage any power? What would be the wanted voltage? You will never get more power out as there goes in. Bertus
  10. bertus

    Power Reduction Query

    Hello, Is it for a model railroad? Than this book might interest you: https://archive.org/details/practical-electronic-model-railway-projects Bertus
  11. bertus

    Newbie Intro

    Hello, You can download a lot of electronics books from the Internet Archive: https://archive.org/details/opensource?query=electronics&sort=-publicdate&and[]=mediatype%3A%22texts%22 Bertus
  12. bertus

    Why a Diode in this circuit?

    Hello, No, Have a look at figure 5.3 A of the following page: https://sound-au.com/ism.htm Bertus
  13. bertus

    Why a Diode in this circuit?

    Hello, See the comments: Bertus
  14. bertus

    Comedy Thread

    Thanks to cmartinez AAC
  15. bertus

    Load cells with 9V excitation voltage

    Hello, What would be the problem with running the strain gauge at 5 Volts? The strain gauge is basicaly a bridge of wheatstone. Perhaps this page will tell you more: https://randomnerdtutorials.com/arduino-load-cell-hx711/ Bertus
  16. bertus

    LG OS 5020

    Hello, As I do not answer in PM's I posted the content of the PM here. From the PM (added some breaks): In the lg os 5020 scope the high voltage oscillator not working. I checked all components in the hv board found ok. Is it self oscillator or any inputs from main board? Is any chance to...
  17. bertus

    Welcome to the Off-Topic forum - Please Read

    The Off-Topic forum is for general discussions about anything not related to electronics. The following are a list of what is not permitted in this forum: - No Spamming or Advertising - No Abusing or Insulting Members - No Adult, Vulgar, Offensive, or other Contentious Content - No Politics -...
  18. bertus

    LG OS 5020

    Hello, Have a look at the manual: https://idoc.pub/documents/lg-os-5020g-oscilloscope-service-manual-8x4emzvrj3l3 The pages 65 and 66 show the supply schematics. Bertus
  19. bertus

    Electronic flourescent tube starter

    Hello, The capacitor was also in the schematic in the link I posted in post #20. Bertus
  20. bertus

    Can the secondary voltage of power supply transformer be determined by the double 25volt caps?

    Hello, I could only find schematics of the KR55 and KR117, wich both use multiple output transformers sa @kellys_eye said. https://www.synthxl.com/kr-55/ https://www.synthxl.com/roland-kr-117/ Bertus
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