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  1. bertus

    MOSFET not giving sufficient power

    Hello, Have a look at these output characteristics: Bertus
  2. bertus

    Question about new schematic- Metronome

    Hello, Is the capacitor 22 uF as in the schematic? When using a smaller capacitor, you will see the effect you see now. bertus
  3. bertus

    Question about new schematic- Metronome

    Hello, The 18K is a fixed value that is determining the highest speed. The 100K is a potentiometer to adjust the speed. Bertus
  4. bertus

    10X Multiplier-Prescaler for Frequencies Above 3GHz

    Hello, The highest I could find is 24 GHz: https://www.analog.com/en/products/hmc862a.html It can divide by 1,2,4 and 8. Bertus
  5. bertus

    capacitors

    Hello, Perhaps you can find some here: https://www.die-wuestens.de/dindex.htm?/k3.htm Bertus
  6. bertus

    Pioneer HTZ121 DVD no sound

    Hello, The service manual is here: https://manualmachine.com/pioneer/htz121dvd/5059726-manual/ You will need to register to get it. Bertus
  7. bertus

    Toast or Useable

    Hello, From this page: https://uniden.com/products/trunktracker-iii-handheld-analog-trunking-scanner Frequency Coverage - 25-225, 400-512, 806-960, and 1240-1300 MHz (excluding cellular bands) There are some hamradio band in this covarage. 10 meters – 28–29.7 MHz – Best long distance (e.g...
  8. bertus

    MOSFET not giving sufficient power

    Hello, The Mosfet module will work much better when you replace the IRF520 by an IRL520. The IRL520 has a much lower threshold voltage. Bertus
  9. bertus

    MP3 module resets at low battery voltage

    Hello, When the battery voltage is dropping, more current will be drawn from the battery to maintain the output voltage. The mentioned MP3 module seems to use 600 mA max at 5 Volts. At a battery voltage of 3 Volts, there will be a current drawn from the battery of (5/3)/0.93 times 600 mA =...
  10. bertus

    How do I connect the pull-up resistor to pin 7 of the LM555 timer?

    Hello, Put a resistor of 330 Ohms or higher in series of potmeter R3, to limit the discharge current. The discharge current is max 50 mA. The attaced PDF will tell you more. Bertus
  11. bertus

    Now the Fun Begins

    Hello, @VenomBallistics , Did you already see my service schematics thread: looking for SERVICE MANUAL FOR SYNTHESIZER & ELECTRONIC MUSICAL INSTRUMENT Bertus
  12. bertus

    Looking for SERVICE MANUAL FOR SYNTHESIZER & ELECTRONIC MUSICAL INSTRUMENT

    Hello, Here I found some pages with a lot of manuals: https://www.synthxl.com/ http://synfo.nl/ https://www.polynominal.com/ https://www.vintagesynthparts.com/service-manual/ Bertus
  13. bertus

    Do you know the Quantum Tech HD youtube channel?

    https://www.youtube.com/channel/UC4Tklxku1yPcRIH0VVCKoeA This is one of the creative examples:
  14. bertus

    Klarstein thermoelectric mini fridge stopped cooling.

    Hello, I also want to mention, that it is not a thermo electric cooler, but a compressor. On the lable there is stated R134a/40 g, wich is a coolant for a compressor. Bertus
  15. bertus

    Klarstein thermoelectric mini fridge stopped cooling.

    Hello, Take the plug off and put the measuring pens in the plug: Bertus
  16. bertus

    Klarstein thermoelectric mini fridge stopped cooling.

    Hello, On the PCB there is connector CN7 (it mentiones K next to it). Is that connected to the thermostat? If it is connected to the thermostat, take it off and see if it reacts with a multimeter in ohms range , with the measuring pins on that connector , when you turn the thermostat knob...
  17. bertus

    Klarstein thermoelectric mini fridge stopped cooling.

    Hello, Strange, I have answered the question before. The second fan only runs when the cooling unit is active. Is the temperature regulator in working order? Bertus
  18. bertus

    The mobile power bulges

    Hello, Have a look at this: https://www.tomsguide.com/reference/smartphone-swollen-battery https://temperaturemaster.com/why-do-lithium-batteries-swell/ Bertus
  19. bertus

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

    Hello, Are both power connectors fitted? The 24 pin is the main power, the 4 pin is for the CPU. See page 15 of the manual. Bertus
  20. bertus

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

    Hello, I mean JP1 next to the battery and not the reset button. Bertus
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