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    • #12064

        Hi all,

        Did you know that the Lectron legacy school systems 1100 and 1101 (combined the 1102) has a wealth of circuits that aren’t published in the standard 90 page manual that came with the start set ?

        Let us take as example circuit 11.50 which demonstrates the astable multivibrator.

        In contrast with the standard circuit of the standard manual, this school version needs lesser blocks to obtain the same result !

        As comparison, the original School system diagram and an adapted one with legacy parts.
        I added an extra light bulb and used the same transistors with 100k resistor so the blinking sequence is the same.
        Feel free to alter the components (use transistor with 330k, 1,5k resistor instead of lamp, etc.)

        Don’t forget to post your comments here !

        simple astable

        And here a gif of the working project.

        Many greetings


      • #12088

          Another great circuit Frank!

          For the electronics beginners (and I include myself), could you please explain how an astable multivibrator is used in practice?  How is it useful in circuit designs?

          For the benefit of our fellow Lectroneers, the 1102 curriculum is comprised of Electicity and Electronic I and II student/teacher documents.

          Thanks so much,

          • This reply was modified 1 year, 4 months ago by Michael.
          • This reply was modified 1 year, 4 months ago by Michael.
        • #12239

            Hello Michael,

            The astable multivibrator is mostly used in digital circuitry but also in analogue setups.
            Nowadays, we use Schmitt trigger inverters or Nand gates to obtain the square pulses.
            In analogue circuits, we can find it in a somewhat adapted version for wherever oscillations are required.
            Many greetings,

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