Viewing 3 reply threads
  • Author
    Posts
    • #6718
      LectronFan
      Moderator

        Hello everybody,

        Today we are going to build a circuit and it’s up to you to figure out what this magical lamp does !

        Why is there a switch in the circuit and what does it do ?

        Why is there a 10µF capacitor ?

        The easiest way to find out what happens is to build the circuit 😆

        Here’s the setup :

        Magical lamp

        Please post your answers here and we will discuss the working principle.

        Greetings

      • #6810
        meerweten
        Participant

          To my understanding:

          R1 is some kind of current limiting resistor. probably due to a to high voltage.

          in the first stage, T1 is disabled, this means that T2 is enabled and current flows thru the lamp.
          R2 and C1 form some kind of statupdelay.
          when hitting a certain point T1 will flip over and switch of the lamp until the switch is pushed

        • #6813
          Michael
          Keymaster

            Welcome to the Forum meerweten! 

            Thanks very much for your engagement and involvement.  Look forward to reading your future replies and hopefully topics!

            Best regards,
            Michael

            • This reply was modified 4 years, 5 months ago by Michael.
          • #6814
            LectronFan
            Moderator

              Hello meerweten and welcome to the forum of fun !

              Aha, the magic lamp …

              Indeed R1 is a current limiting resistor to protect the lamp (6V, 60mA).

              At startup, let’s assume that T1 is conducting and T2 is not.

              What do you think will happen with the lamp ? Will it remain dark or will it light ?

              Can you see why  ? (hint : R3 is responsible for this).

              So, what do you think will happen when the switch is pushed ?

              You’re on the good way !

              Greetings

              • This reply was modified 4 years, 5 months ago by Michael.
              • This reply was modified 4 years, 5 months ago by Michael.
              • This reply was modified 4 years, 5 months ago by Michael.
          Viewing 3 reply threads
          • You must be logged in to reply to this topic.