👍Band-pass filters is another good topic, double-tuned circuit in particular. This circuit is often used in amateur radio receivers / transceivers. It combines LC filters and transformers.
Thank you for the video and the app recommendation. I'll give the Marki online app a try, though I really prefer downloadable apps. I don't like depending on the internet and the kindness of the online web page owner to always keep the free app available. I've seen more than 1such useful page pop up with a perpetual HTTP 404 error, or I want to do some dev work but I'm somewhere without a web connection. As a ham radio builder and experimenter with only a high-school (12 year) education such PC applications allow me to nearly optimize my designs without spending hours playing with variable inductors and capacitors, then measuring the values off the devices to then replace with fixed values. I've become a real fan of device value selection apps, and circuit modeling programs.
I fully agree that a stand alone, local, piece of software is far more reliable in the long term, but at least for this series I will try to recommend the best tool - giving the best performance, that I can find, which is free. Anyway, there is no single correct answer when it comes to filters - you can reach the same outcome using multiple methods.
A good tool to run locally on a PC is RFSim99. This is a simple mainly passive components design and simulation tool which works in the S parameter domain. The output is either as a bode plot or Smith chart. It has a few filter, impedance matching and attenuator design calculators which I find very useful. And you can run a tolerance sweep and see the effect of component variations. You can also import S-parameter files from a VNA, ie. to see the effect of a measured load or source impedance on a (filter) circuit. It is an older tool but I use it a lot for designing my (ham radio) circuits.
Greetings, great video. Just curious, is there music playing in the background of your opening monologue? If there is it's kind distracting on my audio system - if you've always had it I never noticed before. Thankfully it doesn't appear to be there in the rest of the video.