#garfield Logs

Nov 25 2024

11:52 AM aandrew: oh yeah MIPI is awesome if you've got the hardware to drive it
12:05 PM aandrew: there *are* however parallel-to-MIPI boards on ali
12:05 PM aandrew: (also VGA-to-MIPI, HDMI-to-MIPI, etc.)
12:07 PM aandrew: that seems *awfully* expensive
12:07 PM rue_mohr: yea, its a bit too far over the overbuget
12:45 PM aandrew: wtf happened to ali, everything is "price is 5 chips only, not demo board"
12:50 PM rue_mohr: I think the bite of shipping is breaking things
12:50 PM rue_mohr: and who knows what their doing to prep for wtf trump is going to do
03:06 PM polprog: rue_mohr: do you remember a schematic of an audio driver that was using a 7805 and a 7905 as output stage?
03:07 PM polprog: basically moving the ground pins of these up and down so they would change the output voltage
03:07 PM rue_mohr: yes, its in the datasheet
03:07 PM rue_mohr: woo 22 second reply time!
03:08 PM polprog: nah i cant find that one
03:08 PM rue_mohr: wut
03:08 PM polprog: there was a 7805 and the compliment, and the person was connecting the ground pin to a biased AC signal
03:09 PM polprog: or to a transistor that would make the emitter go lower and the collector higher, and the ground were tapped from C and E
03:10 PM rue_mohr: hold on, wehre is it
03:11 PM polprog: ok, ST datasheet has something like that
03:11 PM polprog: not quite, Power AM modulator
03:11 PM polprog: https://www.st.com/resource/en/datasheet/l78.pdf
03:11 PM polprog: fig 24
03:11 PM rue_mohr: yea I know but
03:13 PM polprog: ok the ST datasheet is better
03:13 PM polprog: goddamn a switcher
03:14 PM rue_mohr: hah, yea, I tried building that
03:18 PM rue_mohr: wow I know its out there, cant find it
03:18 PM rue_mohr: searching
03:18 PM rue_mohr: lm338?
03:20 PM rue_mohr: huh
03:20 PM rue_mohr: not the circuit...
03:20 PM polprog: yea looking for it too
03:21 PM rue_mohr: https://i.pinimg.com/736x/4b/ae/9a/4bae9a7743515c69b50c0816825ba99f.jpg
03:22 PM rue_mohr: not what I'm looking for tho
03:22 PM polprog: god what a messy schem
03:30 PM polprog: gotta hit the hay
03:30 PM polprog: good night!
03:35 PM rue_mohr: I couldn't find it
03:38 PM rue_mohr: LM317 audio amplifier schematic
03:38 PM rue_mohr: turns up a few
03:41 PM rue_mohr: I think its the LM317, but I cant find the circuit in app notes
05:59 PM Tom_L: https://www.youtube.com/watch?v=F85tdCemEEk