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  1. bertus

    Not working 12v dc to 220v Ac

    Hello, A simelar circuit is used in this thread: https://maker.pro/forums/threads/doubts-in-making-a-new-inverter-220v.298490/ That circuit has a dead time in there, as it is claimed to be a modified sine inverter. Bertus
  2. bertus

    Need help identifying a resistor

    Hello, With the help of this thread you should be able to "read" the values: https://maker.pro/forums/threads/electronics-color-code.293281/ Bertus
  3. bertus

    Comedy Thread

    Thanks to nsaspook AAC
  4. bertus

    Doubts in making a new inverter 220v

    Hello, Yes, but use a 2 X 15 Volts transformer. The output voltage will be about double you want using the 7.6 Volts transformer. Also the output voltage will not be regulated and drop when the battery voltage drops. Bertus
  5. bertus

    Doubts in making a new inverter 220v

    Hello, Here is the schematic from the video: There are no gate resistors in this schematic, but usualy there are resistors between 10 and 220 Ohms in series with the gate to reduce the gate peak current. The NE555 is rated for 15 Volts, so 16 volts is to high. Reduce the voltage for the NE555...
  6. bertus

    Help identifying this

    Hello When the part is inline with the powerline it could well be a resetable fuse when the part gets hot by overcurrent, it will disconnect the motor when cooled down, the motor will get power again bertus
  7. bertus

    555 LED Circuit not playing nicely

    hello the reset pin should be connected to the plus of the powersource also you will need a current limiting resistor for the led without the resistor, the 555 can push upto 200 mA into the led and burn it bertus
  8. bertus

    Re-capping a 12v PSU - mystery component

    Hello Be carefull with the jumper It could well be the selection between 120 and 240 volts input voltage Wrong setting will create a lot of damage Bertus
  9. bertus

    Marcraft SE-1016 datasheet or manual needed

    Hello, As it is a RC kit, perhaps a RC forum might help: https://www.rcgroups.com/forums/index.php Bertus
  10. bertus

    And now something weird

  11. bertus

    Doubt Aluminium electrolytic capacitor

    Hello, Here we go again. On the capsite you will find every thing you want to know about all types of capacitors: CapSite 2022 Bertus
  12. bertus

    Resistor inside an inductor.

    Hello, You can also find coils wounded around a resistor. These are sometimes used in RF circuits as chokes: Here is a homemade version. Bertus
  13. bertus

    Comedy Thread

    Thanks cmartinez AAC
  14. bertus

    Fire alarm using a PTC as a sensor.

    Hello, Check your schematic. What is the type number for the comparator? Does the comparator need a pull-up resistor? How is the relais powered? Can the bridge work, the way you have drawn it? Bertus
  15. bertus

    Audio Amplifier in Common Emitter Configuration

    Have a look at the following page about biasing techniques: https://www.allaboutcircuits.com/textbook/semiconductors/chpt-4/biasing-calculations/ As @crutschow said there will be very little power Bertus
  16. bertus

    Power supply dead. Pictures inside... repairable?

    Hello, R50 is likely 0.50 Ohms. Bertus
  17. bertus

    Comedy Thread

    Keeping kitty out of the Christmas tree: Thanks to tonyr1084 AAC
  18. bertus

    Realistic STA-2270 amp

    Hello, The schematic and service manual seem to be available here: https://www.hifiengine.com/manual_library/realistic/sta-2270.shtml You will need to register to download them. Bertus
  19. bertus

    Can you discern the circuit ?

    Hello, The following page clearly shows the use of the toroid coil as @davenn suggested: https://www.evilmadscientist.com/2007/weekend-projects-with-bre-pettis-make-a-joule-thief/ Bertus
  20. bertus

    flash memory in dvd drive

    https://climbtheladder.com/10-flash-memory-best-practices/ https://www.ni.com/nl-nl/support/documentation/supplemental/12/understanding-life-expectancy-of-flash-storage.html
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