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  1. bertus

    New Stompbox Project

    Hello, Have a look at the attched PDF's about single supply opamp circuits. Bertus
  2. bertus

    Comedy Thread

  3. bertus

    Magnifying light voltages

    Hello, How about those led ring lights that are used with cameras? https://www.amazon.com/s?k=led+ring+light&i=mobile&rh=n%3A2335752011%2Cp_n_condition-type%3A6503240011%2Cp_72%3A2491149011&dc&qid=1599544296&rnid=2491147011&ref=sr_nr_p_72_1 They are available in different sizes. Bertus
  4. bertus

    New Stompbox Project

    Hello, Here is a list with opamps that are rail-to-rail in and out. There are even opamps that work under 5 volts. Bertus
  5. bertus

    Unknown Component Identification Help Needed

    Hello, It looks like some tilt switch. It has several contacts for the different directions. Bertus
  6. bertus

    Magnifying light voltages

    Hello, It can be that the diac is only used for startup of the oscillator. A kind of kick start. Bertus
  7. bertus

    JAKES LADDER

    Hello, Perhaps this article might interest you: http://www.electricstuff.co.uk/jacobs.html Be carefull with those very high voltages. Safety comes first: http://www.repairfaq.org/sam/safety.htm Bertus
  8. bertus

    Magnifying light voltages

    Hello, @bushtech , could you add the values and connections of the coils? The picture ha a low contrast, it is hard to see some of the traces. I think you have drawn the diodes of the bridge the wrong way around: Bertus
  9. bertus

    Magnifying light voltages

    Hello, @bushtech , I have used the code tags to preserve the spaces in your table. Bertus
  10. bertus

    Magnifying light voltages

    Hello, The MJE13003 is a NPN high voltage power tranistor. Bertus
  11. bertus

    Magnifying light voltages

    Hello, @Martaine2005 , The DB3 is an 32 Volts DIAC. Bertus
  12. bertus

    CS6N70

    Hello, See here: https://www.crmicro.com/ProductSolution/psglqj/mosfet/200v600v/202006/P020200805384125702709.pdf Bertus
  13. bertus

    Magnifying light voltages

    Hello, Here are some circuits for CFL's. There can be one that is comparable with yours. http://www.pavouk.org/hw/lamp/en_index.html Bertus
  14. bertus

    Magnifying light voltages

    Hello, On the tube you should measure two times low resistance for the filaments. It will be between a gray and brown each time. Bertus
  15. bertus

    Magnifying light voltages

    Hello, In many drivers like the one in your lamp. there is high voltage on two pins of the lamp and a capacitor on the other two pins. Compact fluorescence lamps also use the technique, here is an example: http://www.repairfaq.org/sam/cflamp1.pdf Here is the complete page...
  16. bertus

    Dell Optiplex 360 LGA775 motherboard: where are the booting pins ?

    Hello, Can you have a look in the service manual of the optiplex 360: https://downloads.dell.com/manuals/all-products/esuprt_desktop/esuprt_optiplex_desktop/optiplex-360_service manual_en-us.pdf The pages 13 to 16 shows the boards connections. Bertus
  17. bertus

    JVA Fence energiser component ID

    Hello, It is a 470 nF +/- 5% 250 VAC capacitor. Like this on Amazon: https://www.amazon.com/Baomain-0-47uf-Metallized-Polypropylene-Capacitors/dp/B00SAZGGUA Bertus
  18. bertus

    Help Identifying a Component

    Hello, @ChosunOne , You are correct. No tolerance band is 20 % Silver is 10 % Gold is 5 % See also here : Electronics color code Bertus
  19. bertus

    Question about SMPS repair

    Hello, I am using Firefox on my linux system (opensuse tumbleweed). Bertus
  20. bertus

    Question about SMPS repair

    Hello, @Harald Kapp , I have downloaded the images and cropped them. Uploaded again and placed them inline. Bertus
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