We all know that logic circuits need decoupling capacitors, but what do they prevent? What exactly is coupling.
Here I have two 7555 oscillator circuits and their behaviour is completely different when the decoupling capacitors are removed.

By Julian

Youtuber, shed dweller, solar charge controller aficionado

13 thoughts on “Logic circuits need decoupling capacitors – but what is coupling?”
  1. Avataaar/Circle Created with python_avatars Creedo says:

    i can't thank you enough for this !!
    truly amazing work

  2. Avataaar/Circle Created with python_avatars Darkipod says:

    Any chance you can post up the circuit? Id like to do this exercise on my own 🙂

  3. Avataaar/Circle Created with python_avatars ALL ONE says:

    Thanks!

  4. Avataaar/Circle Created with python_avatars Teodor Foca says:

    Excellent explained ! The best explanation I encounter what decoupling capacitors really are ! Thank you.

  5. Avataaar/Circle Created with python_avatars TheFoxranger says:

    Thank you for this short, complete and practical explanation !

  6. Avataaar/Circle Created with python_avatars Ryan Hart says:

    That was a very helpful explanation and demo. Thanks for that!

  7. Avataaar/Circle Created with python_avatars WertzOne says:

    Thanks, I been learning a lot in the past month.

  8. Avataaar/Circle Created with python_avatars Franko Walker says:

    Just found your channel & subbed. That was very informative.

  9. Avataaar/Circle Created with python_avatars g00glian0 says:

    Great great video. I now understand.

  10. Avataaar/Circle Created with python_avatars ello propello says:

    thank you! finally i understand what this decoupling is all about and why my circuits (mis)behave like they do 😀

  11. Avataaar/Circle Created with python_avatars Abe Shudug says:

    do these effect each other because of an electric field? or a voltage line integral

  12. Avataaar/Circle Created with python_avatars Fabricio Fanfa says:

    Dude I've been researching this subject and this is the best explanation I came into by far!

  13. Avataaar/Circle Created with python_avatars MKme Lab says:

    This is one of the best explanations Ive seen. No idea how I missed it for 5 years 🙂 Well done

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