| > I mean there are resistors, capacitors all over the place but I really want to learn reason behind it. There are some good YouTube channels that go into this. EEVBlog[1] has made a lot of really nice videos about the fundamentals, as has w2aew[2]. And I found MicroType Engineering[3] to be a good source of practical information on designing circuits. Capacitors next to ICs are almost always for decoupling[4]. Similar to how the cistern in your toilet provides a large amounts of water in a short amount of time without affecting the water pressure in the rest of the house, hence decoupling the local water flow from the main supply,
decoupling capacitors can supply a lot of current for a short amount of time. However what values to use can seemingly be a bit of a black art[5], not helped by the fact there's so much outdated information and rules of thumb out there from the days of through-hole components which just doesn't apply to modern surface mounted components (like needing multiple different values). On the other hand, resistors on a data line can be there to protect against ESD events[6], for example. Some of it might be a bit more advanced than what you need right now, but there's definitely some good stuff for people starting out. If for nothing else highlighting areas you should be aware of. [1]: https://www.youtube.com/@EEVblog/playlists [2]: https://www.youtube.com/@w2aew/playlists [3]: https://www.youtube.com/c/MicroTypeEngineering [4]: https://www.youtube.com/watch?v=BcJ6UdDx1vg [5]: https://www.youtube.com/watch?v=k7aPb585Y6k [6]: https://www.youtube.com/watch?v=6OxE06n6n44 |