I consider myself fairly advanced, but I am in basics because there are sti ll basic things I do not know or forgot. I designed parametric tone control s and a bulletproof relayless protection syustem for an amp many years ago and quite honestly I could not do it again.
This was a beauty. the bass control turnover was variable from 48 to 480 Hz and has a range of +/- 18 dB. It used a different scheme than the regular Baxandall or whatever using the feedback loop, it mixed. That means the tur nove frequency stayed rock solid at any level of boost or cut.
The protection, well there was DC on the output but it was bridged. ANY sho rt would shut the thing down so fast a relay could never do it. What's more , you could connect the speaker to a car battery and it would burn the wire s off.
If pressed I could do it again I guess, but I am not really impelled to do so. I think cars should not even have stereos. Just radios.
Things have changed, I have changed. I used to build custom amps for cars, and I mean from scratch. Of course I have been one upped by the more recent technology, but whether or not, I simoply don't realy want to do it anymor e.
I am actually looking for something to do. To design again. Tell me your ne eds. Some things I can do, alot of things I can't. But even now I am learni ng.
In fact, I have a math tutor. He ants to learn electronics and I want that higher math, the lack of which has held me back somewhat. when I design I s ometimes have to take a shotgun approach. Overbuild things. I think that is good. I think caascade failures are bad and my approach makes them less li kely.
But still, I need to learn more, even at my age. Even those 80 year old fuc ks in SED are still learning.
The best part of it is doing something useful with it.