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  1. bertus

    Old magazine series 99 IC projects

    Hello, Did you read the text of the led bar graph? When turning up the voltage, led 6 will be on first, then about 0.7 volts higher led 5 will turn on etc. Bertus
  2. bertus

    Old magazine series 99 IC projects

    Hello, I have found a series of old 99 IC projects magazines on the Internet Archive: https://archive.org/details/99ICProjects1979 https://archive.org/details/99ICProjects1980 https://archive.org/details/99ICProjects1981 https://archive.org/details/99ICProjects1982...
  3. bertus

    Opto-isolator/ optocoupler for electric isolation in IC design.

    Hello, Perhaps this article will tell you more...
  4. bertus

    Opto-isolator/ optocoupler for electric isolation in IC design.

    Hello, What kind of optocoupler are you looking for? There are high speed optocouplers with Diac and gate outputs: https://www.vishay.com/docs/84925/vot8026ab.pdf https://www.vishay.com/docs/83683/sfh6700.pdf Bertus
  5. bertus

    pc dell latitude d600 no powers

    Hello, Vhcore is called vcore at many sites. It depends on the CPU used. https://en.wikipedia.org/wiki/CPU_core_voltage Bertus
  6. bertus

    And now something weird

    Gorilla Glue as hair spray, anyone? https://edition.cnn.com/2021/02/08/us/gorilla-glue-girl-scli-intl/index.html
  7. bertus

    Aiber Water flow sensor

    Hello, You could make an electronic anemometer (wind speed) measurement device. This page shows you several designs with comparison between them: http://www.fonema.se/anemom/anemom.html Bertus
  8. bertus

    Aiber Water flow sensor

    Hello, You can not measure the pulses when the sensor is open. It can well be that it spins now, but will not spin when the cover with the magnet is mounted, due to friction. Bertus
  9. bertus

    Aiber Water flow sensor

    Hello, It can well be that the flow sensor will not work for air. The wheel looks to small for air. The sensor is designed for liquids, as you said in the begining of the thread. Bertus
  10. bertus

    Stage Line 500W amp repair project

    Hello, Could it be that 3 and 4 are exchanged? When you measure the speaker between 1 and 4, 4 is the ground. When you measure a high value between 1 and 4, 3 is the ground. Bertus
  11. bertus

    Roland E 20 keyboard preamp no sound from keys

    Hello, Here is a page where you can visualy inspect faulty caps: https://www.robotroom.com/Faulty-Capacitors-1.html Bertus
  12. bertus

    Why is it PNP instead of PPN for transistors

    Hello, I never designed a computer. I did design a patern generator for repairing TV's about 45 years ago. It contained about 30 TTL chips. Bertus
  13. bertus

    Stage Line 500W amp repair project

    Hello, Your signal generator can generate signals upto 500 kHz. The 100 MHz probe will have no problems. The soundcard scope can handle signals upto 20 kHz. Bertus
  14. bertus

    Issue with new Altronix SAV9D Power Supply

    Hello, The indicator lights are also off? Could you measure in front of the PTCs ? Bertus
  15. bertus

    LM339/LM339N can't get output high

    Hello, Have a look at this page for more info on the LM339: http://www.learningaboutelectronics.com/Articles/LM339-quad-voltage-comparator-circuit.php Bertus
  16. bertus

    Trying to make usb-hub

    Hello, The GL850G has input , output and bi-directional signals. Bertus
  17. bertus

    do passive rc filters have problems with 10GHz + frequencies?

    Hello, You can likely not make an RC filter for 10 GHZ. In that range an etched filter on a PCB would be more suitable: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2179-10742013000100010 Even then it will be difficult. Bertus
  18. bertus

    Trying to make usb-hub

    Hello, I have made some remarks on your schematic, that are not clear: I found the V33, it is COMING from the GL850 pin 24. The label shows an incoming signal at the GL850. Please correct ALL labels to have a correct schematic. Bertus
  19. bertus

    VDO Voltmeter

    Hello, Then it must indeed be the 68.1 Ohms, wich is a valid value according E48, E96 or E192 series: Bertus
  20. bertus

    Issue with new Altronix SAV9D Power Supply

    Hello, In the diagram there are 9 PTC resistors drawn. Those are self resettable fuses. When to much current is drawn, the PTC will get high resistance and disconnect the load. When the load is removed, the voltage will come back in a couple of seconds, when the PTC cools down. Bertus
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