#garfield Logs

Jul 09 2025

03:15 PM aandrew: fishing sucked - didn't catch a damn thing and kids lost me two bobbers and hooks and such, but it was a lot of fun and I'm totally doing that again soon with them
03:30 PM aandrew: https://ibb.co/q3tJhPJV
03:30 PM aandrew: am I just fantastically stupid or is this not a bog-standard positive buffer circuit with gain of 2?
04:19 PM polprog: we got some heavy rain today
04:19 PM polprog: aandrew: yeah it looks like it is a gain 2 ckt
04:20 PM polprog: rule of thumb, V+ = V-, V- = 1/2 Vout (divider) Therefore Vout = 2V+ = 2V-
04:26 PM polprog: 0V at the left of R12 would indicate either R11 is short or R14+D4 or R14+C4 is short
05:37 PM aandrew: well no I'm saying I put 0V at the left side of R12 and the opamp output is at the positive raiil
10:28 PM rue_mohr: 1
10:28 PM rue_mohr: Rf/Ri
10:28 PM rue_mohr: ...
10:28 PM rue_mohr: oh non-inverting
10:29 PM rue_mohr: 1+rf/ri