#avr Logs

May 27 2019

01:12 AM polprog: rue_mohr: hmm, maybe it should run off 5 V, and be in the khz range
01:16 AM polprog: for starters, anything will do
02:28 AM rue_mohr: 5V is a moderate challange
02:28 AM rue_mohr: amplifiers, even rail to rail ones, do NOT like the confined space
02:28 AM rue_mohr: I gave up on the filter profiler and ended with a +-9V supply
02:35 AM rue_bed: I suggest something better than 074
02:35 AM rue_bed: I used them because their fet input and I had them
02:36 AM rue_bed: other than that, their sub-spectacular
02:36 AM rue_bed: see if you can find something with 5Mhz or better GBW
02:37 AM rue_bed: lm741 is on the bottom of the food chain for sure
02:37 AM rue_bed: there are good amps out there
02:37 AM rue_bed: iirc the 074 has 2V margins
02:37 AM rue_bed: aka, 9V supply, you can only go to 7V with the signals
02:38 AM rue_bed: as I'm only interested in +-5V, I'm ok
02:42 AM polprog: hmm
02:42 AM polprog: im short on opamps
02:43 AM polprog: in DIP, i only have lm324 (and its 2-amp cousin i dont remember the name of), tl074
02:43 AM polprog: i have one free soic8 breakout so i could solder on one of those 3MHz video opamps...
03:36 AM rue_bed: yea, I'v been thinking of using a vid amp for the oscillator
09:40 AM Emil_ is now known as Guest3273
03:15 PM gsi__ is now known as gsi_
09:20 PM rue_mohr: <rue_mohr> http://ruemohr.org/~ircjunk/projects/filterprof/lowp1k-bode.png
09:20 PM rue_mohr: <rue_mohr> !!!
09:20 PM rue_mohr: <rue_mohr> so, when the return amplitude gets too low, the readings go a bit crazy
09:20 PM rue_mohr: <rue_mohr> and apparently its got some sensitivity to really low phase angles
09:20 PM rue_mohr: <rue_mohr> but yea!
10:47 PM nabil_ is now known as nabil
11:29 PM day__ is now known as day
11:38 PM davor_ is now known as davor