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  1. bertus

    Tesla Coil Kit - help needed

    Hello, Do you have the decription of the kit? Does the description contain a schematic? Bertus
  2. bertus

    Questions many hours for recharge battery lithium via USB cable connected in Hub USB

    Hello, It depends on how "smart" the charger circuit in the pen is. As you did not provide any information, we can not give you the information if it is safe for the pen. Bertus
  3. bertus

    Service manual/schematic Hameg HM1500

    Hello, The page is giving false information. There is no schematic in the user manual. Bertus
  4. bertus

    building an audio crossover

    Hello, No, the site where the images where linked to, has moved on the internet. Bertus
  5. bertus

    building an audio crossover

    Hello, I see that some images are missing in this old project. It seems to be based on this circuit on ESP: https://sound-au.com/project09.htm Bertus
  6. bertus

    Service manual/schematic Hameg HM1500

    Hello, @Harald Kapp , The mentioned manual is the user manual and does not contain the wanted schematic. Bertus
  7. bertus

    Clock Circuit from crystal oscillator

    Hello, When the crystal has 4 pins, it is likely an oscillator: https://en.wikipedia.org/wiki/Crystal_oscillator Bertus
  8. bertus

    Questions many hours for recharge battery lithium via USB cable connected in Hub USB

    Hello, I do not understand the current being 150 mah. mah is used fro battery capacity and not for current. Bertus
  9. bertus

    Questions many hours for recharge battery lithium via USB cable connected in Hub USB

    Hello, What kind of hub is used? A Passive hub will only get power from the device it is connected to, likely the PC. An active hub will have an external power supply and might be capable of delivering more power. Bertus
  10. bertus

    A ground / negative connection question

    Hello, You want to have a look at this book: https://archive.org/details/ElectronicsForHobbyistsByHeath1980/mode/2up Bertus
  11. bertus

    Clock Circuit from crystal oscillator

    Hello, Have a look at this page: http://www.z80.info/uexosc.htm Bertus
  12. bertus

    Garage door remote water damaged

    Hello, What are the keys made of? When they are of the rubbery kind, the graphite layer om the inside of the key may be damaged. Bertus
  13. bertus

    Powering LED strip

    Hello, For pickups there are different models. There are types with one large coil: https://www.guitarplayer.com/gear/interpreting-pickup-specs-part-one And there are types with 6 individual coils for each string: https://lawingmusicalproducts.com/zexcoil-design As the leds do not emit an...
  14. bertus

    Capacitor Help

    Hello, Did you check R104 and Q111 ? It looks like the voltage on the capacitor is to high due to failing parts. Bertus
  15. bertus

    Powering LED strip

    Hello, The ledstrip you show has programmable controller chips on them. They get the commands from the remote control. Those are not so easy to let them blink. Bertus
  16. bertus

    Powering LED strip

    Hello, What circuit did not work? What are the specs of the used ledstrip? Bertus
  17. bertus

    Capacitor Help

    Hello, That is strange. In the shown table, C114 is 100 uF, in the schematic it shows as 470 uF: Looking at that part of the schematic, less than a volt is accross the capacitor. Could it be that transistor Q111 has failed, having much more voltage accross the capacitor? Bertus
  18. bertus

    Capacitor Help

    Hello, Is there a link to the service manual or schematics of the unit? That way we could look, by the hand of the schematic, what is happening. Bertus
  19. bertus

    Capacitor Help

    Hello, Did you place the capacitor the correct way around? Electrolytic capacitors are polarity sensitive. When it is mounted the wrong way around, it is prone to fail again. Bertus
  20. bertus

    What are these sections of this power supply?

    Hello, On this page a screenshot of the TSC software shows a schematic: http://www.duncanamps.com/tsc/index.html There seem to be several types of tonestacks in the software to play with. Bertus
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