I did all this stuff as a technician in the army 50 years ago - such very nice, kind and supportive people l worked with compared to many of the civilian places l worked afterwards.
Very resourceful. These days basic electronics is never taught in classes properly, as things have become very advanced and lot of chapters need to be covered in small time. But during those days, when this video was made, LC filters were probably quite advanced and hence covered in details. I especially like the explanation for T and PI section filters.
I am not sure if it was advance staff at that time as they are just basics but I appreciate good explanations maybe because it was for Army purpose so they wanted to be as simple as it can be? Still one of the best explanations about filters. Another thing , I have acces to free courses (from my company where I work) and they have similar courses (but modern courses!) for filters and it is very good so if they want they can teach but somehow these days people have no motivation or money or I don't know what to teach properly...
Electric circuits, like filters, where he said at time 1:20, "all filters consist of capacitors, inductors, and resistors" -- reminds of Taco Bell. They sell the same few ingredients, just in different combinations
That's not really true. You don't have to worry about any of that in normal circuits any more than you have to worry about the "reactance" of the wires. If you are in the middle of an integrated circuit "chip" where you are running at super-high frequencies with square wave components you need to take this stuff into considering, otherwise it's like claiming you have to worry about relativistic effects when you walk to the park.
In part A, as well as this video, they say that the resistor has no filter action, but in reality, the resistor has both a slight amount of inductance, and capacitance, and would become apparant at the higher frequencies. Everything has some L and C in any AC circuit, and must be considered as stray L and C.
Why don't I ever get around to making a notch filter for my guitar amp! That freakin' hum at 60Hz and probably 120... bugs me. Humbuckers are too boxy sounding. Maybe I just figure that Fender, or Marshal, or whoever would've already made it.
