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    • #9166
      LectronFan
      Moderator

      Hi all,

      After experimenting with the Schmitt trigger, build with discrete components, let’s study the module included with the 300 expansion set (Computer electronics).

      This is the diagram of the module :

      Schmitt trigger module

      And here some pictures :

      Schmitt trigger closeup

      If we build following circuit, you’ll see that its behaviour is just the same as the circuit with discrete components.

      Schmitt trigger module

      Some questions :

      • Can anyone explain the working principle ?
      • Do you think it would harm transistor T1 if we connect its base directly to the Schmitt trigger’s output ?
      • What do you think will happen when we use a smaller value for R3 ?
      • Try it out to see for yourself !

      Many greetings,

      Frank

      • This topic was modified 5 months, 1 week ago by LectronFan.
    • #9177
      Michael
      Keymaster

      Thank you for developing new uses of the legacy ST module from the Ausbausystem 3 model.  So glad that your modules are still working after all these years!  This model (and its full-blooded companion the System 300) came out in about 1969 and it is still serving a useful purpose with your excellent tutorials.  Thank you.

      • This reply was modified 4 months, 3 weeks ago by Michael.
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