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  1. bertus

    My PC doesn't turn on! even the fans don't spin!

    Hello, It is a jumper that must be shifted. It is no button. Bertus
  2. bertus

    My PC doesn't turn on! even the fans don't spin!

    Hello, Did you try to clear the CMOS? See page 19 of the manual: https://www.zotac.com/download/mediadrivers/mb/man/pa186.pdf Bertus
  3. bertus

    Can this be repaired by a complete novice please? Basic circuit repair?

    Hello, Looking at the markings on the PCB, the flat side goes to the inductor. Bertus
  4. bertus

    Comedy Thread

    Thanks to Ford Perfect of AAC
  5. bertus

    class A push - pull amplifier ?

    If you keep up the attitude you show, you will be in problems. The other moderators are also notified.
  6. bertus

    class A push - pull amplifier ?

    Hello, Did you have a good look at your posted page: http://www.sm0vpo.altervista.org/tx/rf_pa_cct_00.htm#trans BTW the amplifiers will be broadband, as there are no tuned circuits in it. Bertus
  7. bertus

    Velleman 12 key common output confusion

    Hello, The schematic you posted in post #8 looks like a code lock: A fixed order of numbers needs to be entered to activate the lock. Bertus
  8. bertus

    Can this be repaired by a complete novice please? Basic circuit repair?

    Hello, It looks like there are 4 holes for the part. It could be the part is a kind if SMPS led driver. Are the any numbers readable on the part? Bertus
  9. bertus

    Velleman 12 key common output confusion

    Hello, That shows that the switch is working. You could test the other switches the same way. Bertus
  10. bertus

    Now the Fun Begins

    Hello, @VenomBallistics , You might be interested in this page: https://www.hobby-hour.com/electronics/s/guitar-effect-schematics.php Bertus
  11. bertus

    Velleman 12 key common output confusion

    Hello, What is your meter? You could also measure the resistance of the switches, using the resistance range of the meter. As for the / , it is not used. On the velleman site the box for pin 2 is slashed. Bertus
  12. bertus

    Velleman 12 key common output confusion

    Hello, What is the load of pin 3? The velleman site states a maximum switch resistance of 200 Ohms. https://www.velleman.eu/products/view/?id=603 It looks like the switches are made of carbon contacts. Bertus
  13. bertus

    class A push - pull amplifier ?

    Hello, What are your intentions with the 14 MHz transmitter? 14 MHz is a licensed radio amateur band. https://en.wikipedia.org/wiki/Amateur_radio_frequency_allocations Do you have a license? Also it is close to the 13.56 MHz of the RFID frequency...
  14. bertus

    And now something weird

    How much gold is there in an olympic medal: https://www.compoundchem.com/2021/07/27/tokyo2020/
  15. bertus

    Now the Fun Begins

    Hello, ESP has a page about audio design with opamps: https://sound-au.com/dwopa2.htm Peter Vis has a page where you can calculate a baxendal tone control: https://www.petervis.com/record_players_and_turntables/baxandall-tone-control/circuit-and-calculator.html And Anglefire has a page with all...
  16. bertus

    Now the Fun Begins

    Hello, You could also try different colors of leds, as each color has its own curve: Each color will give an other distortion sound. You will also notice difference between Germanium , Silicium and Shottky diodes. Bertus
  17. bertus

    Now the Fun Begins

    Hello, I have enhanced the contrast of the picture: You can not connect outputs of opamps together. With some resistors in the output leads will work, or a mixing scheme like @VenomBallistics suggested. Bertus
  18. bertus

    COVID-19

    Found at compoundchem: https://www.compoundchem.com/category/chemistry-in-the-news/coronavirus/ https://www.compoundchem.com/coronavirus/
  19. bertus

    Toyota Order Picker PCB

    Hello, As long as the value and tollerance are the same and the working voltage 50 Volts or higher, you will be OK. Bertus
  20. bertus

    Toyota Order Picker PCB

    Hello, OK, the 334 tells me te capacitor has a value of 330000 pF = 330 nF = 0.33 μF The K tells me the tollerance is 10 %. The 50 Volts on the other side is the maximum working voltage. Bertus
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