#garfield Logs

Sep 26 2021

02:40 AM rue_mohr: silkscreen worked out ok
02:48 AM rue_mohr: Tom_L, you getting better or worse?
12:13 PM Tom_L: it's a very slow road
01:18 PM rue_mohr: is it more of a cold or flu?
01:18 PM Tom_L: covid
01:19 PM rue_mohr: really?
01:19 PM Tom_L: but i'm getting better just really weak now
01:19 PM rue_mohr: this late in the game?
01:20 PM Tom_L: may try to work mid week, we'll see
01:21 PM Tom_L: i've had some stuff in my time but this is by far the worst
01:37 PM rue_mohr: yes, its killed a lot of people :S
05:59 PM rue_shop3: well damn
05:59 PM rue_shop3: extended testing of my light supply has the main power inductor heating up too much
06:02 PM rue_shop3: Tom_L, now I'm thinking I should check in on you more often
06:02 PM rue_shop3: do you know if your past the half way mark?
06:09 PM aandrew: rue_shop3: that was an interesting silkscreen; I've never done my own board silk before, is that just more toner transfer?
06:10 PM aandrew: all you can really do for covid is keep your vitamin D up (maybe 2000-3000 IU/day) and keep on the fluids
06:11 PM aandrew: and if you're at all geeky, get one of those SPO2 finger monitors and get your ass some emergency help if you dip below 80%, but it sounds like you're thankfully one of those whom it just acts like a bad cold/flu for
06:21 PM rue_shop3: 0.22mH
06:21 PM rue_shop3: aandrew, yes, and I just used word, so I didn't have a mirror option
06:21 PM rue_shop3: er, which image ;)
06:31 PM polprog: rue i wonder why didnt you put a copper fill on that pcb
06:31 PM polprog: the paper would not bulge so much
06:32 PM polprog: im considering putting heavy thieving on when i design my next pcb, even a 3x3mm empty field will make the paper expand and possibly tear up the toner >_>
06:41 PM rue_shop3: the toner transfer cant
06:41 PM rue_shop3: the printer cant do the flood with enough ink
06:42 PM rue_shop3: I think most laser printers reduce the toner when doing floods
06:43 PM rue_shop3: 45
06:43 PM rue_shop3: ./inductor -l 0.05m -n 45
06:43 PM rue_shop3: Inductance is: 50.000uH
06:43 PM rue_shop3: Turns is: 45.000
06:43 PM rue_shop3: Constant is: 24.691n
06:43 PM rue_shop3: I need shellac for dipping transfoerms in
06:46 PM rue_shop3: I didn a new inductor for the light power supply, but its whistling like a banshee
06:46 PM rue_shop3: which has been a bane of many of the converters
06:48 PM Tom_L: i'm halfway to somewhere
06:51 PM Tom_L: aandrew, D, B12 & C
06:52 PM rue_shop3: ok I bumped up the osc and now its just kinda a static like noise
06:52 PM aandrew: Tom_L: ah so you're already in good hands then, hope you have a swift recovery
06:52 PM Tom_L: had a B12 shot too
06:52 PM polprog: nighters
06:52 PM Tom_L: and another possibly tomorrow
06:52 PM aandrew: wife caught it right when the pandemic started in Jan 2020, she's a very, very healthy person and it was by far the worst illness she's had in 20 years
06:53 PM rue_shop3: yea
06:53 PM rue_shop3: do we know just how many people it took out in Itally?
06:53 PM aandrew: I read that respiratory illnesses really tax your vitamin D stores and people are generally low on it on average as is
06:53 PM Tom_L: i had scarlet fever for 2+ weeks as a kid and this is worse
06:54 PM aandrew: I've had a ton of tests (when my 9yo is on set we're tested every few days), had an antibody test just out of curiosity, I've never caught it (touch wood)
06:55 PM rue_shop3: I wonder if this converter will drive the cats insane
06:55 PM Tom_L: noisy?
06:57 PM rue_mohr: HF yea
06:57 PM rue_mohr: it was running at 25khz, I switched it to 58
06:57 PM rue_mohr: but at 58 its running kinda random, so its more of a static than a whistle
06:58 PM aandrew: heh I don't think I've made a switcher that worked <250kHz in ages
06:58 PM aandrew: I'm usually aiming at the single-digit MHz but then again am not doing it "from scratch" like you are
06:59 PM rue_mohr: yea you need special stuff over 500kHz
06:59 PM rue_mohr: do you have a fav controller?
07:00 PM aandrew: lately, whatever's in stock
07:00 PM aandrew: I almost always use TI
07:00 PM rue_mohr: ah
08:05 PM rue_shop3: ok, its all equalized now and its looking good, the heatsink on the transistor and diode is at whats probably a watt or so of heat
08:05 PM rue_shop3: new inductor is cool
08:05 PM rue_shop3: BOX AND SHIP IT!
08:06 PM rue_shop3: ... just need a box and a ship...
08:28 PM aandrew: 1W of heat, how many W of power ot the light?
08:29 PM rue_mohr: 21
08:29 PM aandrew: not terrible at all
08:30 PM rue_mohr: its all transient on the mosfet, the waveform from the LM393 has not got great slew
08:30 PM rue_mohr: I was avoiding a fet driver chip
08:30 PM rue_mohr: a bipolar stack might have done better tho
08:30 PM aandrew: I thought your inductor was getting warm too
08:31 PM rue_mohr: changed it out, litz seemed to be the key
08:31 PM rue_mohr: and its only 25Khz
09:12 PM rue_mohr: hahah
09:12 PM rue_mohr: I might need to dial it down more...
09:28 PM rue_mohr: the array takes 1800mA, I gave it 1000
09:28 PM rue_mohr: its too bright I think
09:28 PM rue_mohr: printing mounting clips for it...