#garfield Logs

Jan 12 2021

12:59 AM rue_bed2: I should look into all-pass filters too
01:06 AM rue_bed2: they let all the freqencies thru, but depending on the frequency they shift the phase
01:06 AM rue_bed2: I didn't get my high pass filter, but I think I know more
01:06 AM rue_bed2: I have some things to try if I have time tommorow
10:24 AM aandrew: lookit rue_mohr getting all academic on twitter
10:24 AM aandrew: seriously though, very good tweets, this is one of the holes in my personal electronics (and math) education
10:25 AM aandrew: Tom_L: *sqrt(2) I think gets you the peak
10:26 AM aandrew: but .707 (1/sqrt(2)) is your effective RMS
06:19 PM rue_mohr: yea the education I had seem to have left a lot to be desired
08:53 PM rue_mohr: so, my low-pass code worked, I want to re-derive it
09:38 PM Tom_L: know of any known issues with win 10 and SD card readers?
09:38 PM Tom_L: friend helping a friend... now he's calling me to help them both
09:41 PM rue_mohr: I GOT IT!
09:41 PM rue_mohr: Vo = Vi - Vc;
09:41 PM rue_mohr: Vc += Vo / 10.5;
09:43 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/foo101.png
09:44 PM rue_mohr: Here is a good question tho, why does it have a bit of gain?
09:45 PM rue_mohr: I ran into a curious issue earlier too
09:45 PM rue_mohr: on the code that didn't emulate resistors or caps, that just did a voltage divider, the 0.5 mark wasn't -6db, it was -6.4----
09:46 PM rue_mohr: so, its like there is an offset error somehow
10:53 PM rue_mohr: darkrose, house?
10:55 PM Tom_L: what's with the vat increase on shipping to eu?
11:14 PM rue_mohr: brexit
11:15 PM rue_mohr: They warned of the ripples