• This topic has 2 replies, 3 voices, and was last updated 4 weeks ago by mwpeters75.
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    • #6718
      LectronFan
      Participant

      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
      Spectator

      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
      mwpeters75
      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 weeks ago by mwpeters75.
    • #6814
      LectronFan
      Participant

      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 weeks ago by mwpeters75.
      • This reply was modified 4 weeks ago by mwpeters75.
      • This reply was modified 4 weeks ago by mwpeters75.
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