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  1. bertus

    Troubleshooting guides on the Internet Archive

    Hello, Here are a couple of books on troubleshooting: https://archive.org/details/how-to-diagnose-and-fix-everything-electronic https://archive.org/details/how-to-diagnose-and-fix-everything-electronic-2nd-ed./mode/2up https://archive.org/details/electronic-troubleshooting-4th-ed...
  2. bertus

    Laser diode power supply

    Hello, On the page that @Harald Kapp showed, there is a picture of the ESD bridge: Bertus
  3. bertus

    Forum Upgrade & Merging with Maker.pro

    Hello, @eerob , the links in the Project Discussions forum still link to electronics point. This leads now to error messages. Bertus
  4. bertus

    Forum Upgrade & Merging with Maker.pro

    Hello, Lets see if a dollar sign with a space will work. $ 100 $100 $100,20 Bertus
  5. bertus

    Forum Upgrade & Merging with Maker.pro

    Hello, @eerob As shown by other members, the parsing of the dollar sign seems to go wrong. Could you have a look at the issue? Bertus
  6. bertus

    Comedy Thread

  7. bertus

    Op Amp how does the feedback factor works ?

    Hello, You could also have a look at this page of the text book: https://www.allaboutcircuits.com/textbook/semiconductors/chpt-8/divided-feedback/ And the analogy: https://www.allaboutcircuits.com/textbook/semiconductors/chpt-8/an-analogy-for-divided-feedback/ Bertus
  8. bertus

    Op Amp how does the feedback factor works ?

    Hello, You have inverting and non-inverting amplifiers. More info in this TI application note: www.ti.com/lit/an/sboa092b/sboa092b.pdf Bertus
  9. bertus

    what's this part?

    Hello, As @Bluejets said, there are a couple of tuning coils capacitors and resistors in that rack. It could be that it is used as a selectable filter. Bertus
  10. bertus

    Difficulty finding the appropriate resistor with power calculation

    Hello, You can also calculate the power from the voltage and resistance: P = v² / R Bertus
  11. bertus

    Detection of electronic device

    Hello, Have a look at a bat detector. Bats will make ultrasonics sound. Bertus
  12. bertus

    QCY T13 Bluetooth Headphone Battery Error

    Hello, Your images do not show. Reduce the size of the images to about 300 kB and upload them to the forum. Bertus
  13. bertus

    Kenwood TS 830S

    Hello, The service manual seems to be here: https://www.jabse.com/L0tlbndvb2QvVFM4MzBTLnBkZg-- Bertus
  14. bertus

    lithium battery for PCB ?

    Hello, There are also some bigger lithium batteries than @Harald Kapp showed. Have a look at this page: https://www.tme.eu/en/katalog/?search=pcb%20lithium%20BATTERY&s_field=accuracy&s_order=DESC&mapped_params=496%3A1447430%3B Bertus
  15. bertus

    Buzzer Circuit

    Hello, Why do you want to power the buzzer via the 1K (R2) resistor? Do you have the specifications of the buzzer? Bertus
  16. bertus

    Comedy Thread

    Thanks cmartinez AAC
  17. bertus

    Grounding a Ham Antenna

    Hello, Diamond also has a suitable lightning arrester: https://www.diamondantenna.net/sp1000pw.html Bertus
  18. bertus

    cfi chirps every 50 seconds..

    Hello, What is a CFI? https://www.acronymfinder.com/CFI.html I have some smoke detectors that will chirp every 50 seconds when the battery is going low. Bertus
  19. bertus

    LED Array question

    Hello, Bertus
  20. bertus

    Pseudo randomness based on this

    Hello, Do you mean the schematic in the first post? The labels on the 4017 are all wrong. Sorry that I did not notice the labeling. These are the correct labelings: Bertus
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