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  1. bertus

    LED lit cabinets

    Hello, You might want to use some door switches: Door switches at google images Depending on the current and the way the door opens the type may differ. Bertus
  2. bertus

    I cant find where to buy spark gap "circuit interrupters"

    Hello, There are sparkgaps at Mouser. The voltages are from 60 Volts and higher: https://au.mouser.com/Circuit-Protection/Gas-Discharge-Tubes-GDTs-Gas-Plasma-Arrestors/_/N-5g3f?Keyword=spark+gap&FS=True Bertus
  3. bertus

    Designing differential Signal modulator.

    Hello, Have a look at the ISO122 isolation amplifier datasheet. That will explain the working of the isolation barrier. Bertus
  4. bertus

    Looking for guidance on CRT TV repair

    Hello, The service manual can be downloaded here: https://elektrotanya.com/sony_kv-21fa315_21fa515_29fa315_29fa515_chassis_ba-6.pdf/download.html Bertus
  5. bertus

    Help needed for Troubleshooting Sony KV-G21B1

    Hello, When the powersupply is constantly switching on and off (hicking) , there must be an overload on the power supply. Bertus
  6. bertus

    Audio information and calculators

    Hello, Here I have a site with a lot of information on recording and calculations for audio. The site is part in german and part in english: http://www.sengpielaudio.com/index.html Bertus
  7. bertus

    Audio information and calculators

    bertus submitted a new resource: Audio information and calculators - Audio Read more about this resource...
  8. bertus

    Looking for guidance on CRT TV repair

    Hello, What you see on the pictures are flyback lines. When the TV is working properly, the flyback lines are suppressed. Have a look at this section of the TVfaq: http://www.repairfaq.org/sam/tvfaq.htm#tvretlin Bertus
  9. bertus

    Notable Threads on All About Circuits

    Hello, There is a collection of threads that can be helpfull at All About Circuits: Notable Threads Bertus
  10. bertus

    Notable Threads on All About Circuits

    bertus submitted a new resource: Notable Threads on All About Circuits - Notable Threads Read more about this resource...
  11. bertus

    Why is it PNP instead of PPN for transistors

    Helium is much more expensive than hydrogen. Hydrogen is highly flamable. Bertus
  12. bertus

    Why is it PNP instead of PPN for transistors

    Hello, Helium ans nitogen are not flamable. The helium is used to cool the magnet, the nitogen is used as isolation. Bertus
  13. bertus

    Why is it PNP instead of PPN for transistors

    Hello, @ratstar , A PPN device would not exist. The PP junction can be seen as one, so a PN device is left, wich is a simple diode. Bertus
  14. bertus

    Why is it PNP instead of PPN for transistors

    Hello, Super conducting magnets do use liquid helium to have the super conducting property. We even have magnets that are pumping the helium to have a helium temperature of 2K. https://www.bruker.com/en/products-and-solutions/mr/nmr/ascend-nmr-magnets.html FYI , The 1200 Mhz magnet is about 28...
  15. bertus

    Heathkit Super Clock GC-1195 w/chimes

    Hello, It is never a good idea to run a led at its maximum specicified current. As @Martaine2005 said, use a 100 Ohms resistor and see how bright the led is. Bertus
  16. bertus

    In desperation! Roland E600 startup fault.

    Hello, You can download the service notes from this website: https://www.manualslib.com/manual/1117743/Roland-E-600.html Bertus
  17. bertus

    Designing differential Signal modulator.

    Hello, I would also not call it differential. Have a look at the wiki about differential signaling: https://en.wikipedia.org/wiki/Differential_signaling It would rather be alternating between the two channels. Bertus
  18. bertus

    Heathkit Super Clock GC-1195 w/chimes

    Hello, In post #17 @Martaine2005 mentioned a 100 Ohms resistor in series with the led. In post # 21 I mentioned : When you use a 100 Ohms for the led itself, the resistors on the transistor should be in the range of 220 to 1000 Ohms. The 220 to 1000 Ohms is for the R219. Transistor Q209 will...
  19. bertus

    Spi connections

    Hello, Digikey has also an info page on SPI: https://www.digikey.com/en/articles/why-how-to-use-serial-peripheral-interface-simplify-connections-between-multiple-devices Bertus
  20. bertus

    Current transformer

    Hello, Did you have a look at the LEM current sensors? Here is a link to the CKSR series: https://www.lem.com/sites/default/files/products_datasheets/cksr_series.pdf They have a circuit build in for signal conditioning. Bertus
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