#garfield Logs
Apr 20 2020
#garfield Calendar
12:18 AM rue_shop1: it would help if my relaxation oscillator could do 100kHz
01:27 AM polprog: morning
01:28 AM polprog: rue_shop1: I see a great potential for a sawtooth wave gen in that current source circuit of yours
01:28 AM polprog: and one that is easy to calculate (because the cap is charged with constant current)
08:32 AM polprog: rue_bed: what video card are you installing?
10:18 AM polprog: cut up the adapter boards
10:18 AM polprog: im not sure how to make the pin headers inline
10:26 AM rue_shop1: polprog, :)
10:26 AM rue_shop1: just be aware its not totally stable, its slope will change slightly with temp
10:26 AM rue_shop1: I have a tripplehead radeon cedar
10:27 AM rue_shop1: inline?
10:27 AM polprog: oh, nice
10:27 AM polprog: inline as in im drilling holes by hand, dremel, no stand, no autogenerated hole primers
10:27 AM polprog: or whatever you call them
10:28 AM polprog: my pads are basically a copper circle
10:28 AM polprog: ill have to somehow make 7 holes, in a line, spaced by 100 mils
10:28 AM polprog: and the drill likes to slide...
10:29 AM polprog: why not use the internal gpu?
10:34 AM rue_shop1: cnc drill press?
10:34 AM rue_shop1: I just do them by hand
10:35 AM rue_shop1: you should be able to hit within about 15 thou by eye
10:35 AM rue_shop1: its usually close enough
10:35 AM rue_shop1: well, that boost power supply, cant get much simpler
10:35 AM rue_shop1: I'd like to use the transistor in the 555 for the switching, but it cant
10:36 AM rue_shop1: the smps chip was a complete fail
10:36 AM rue_shop1: couldn't do 50mA
10:36 AM Tom_L: morning
10:37 AM rue_shop1: morning
10:38 AM Tom_L: pc all happy again?
10:39 AM Tom_L: will it drive all 3 at once?
10:54 AM polprog: the issue is that the dremel reallt slides around
10:55 AM polprog: ill try to prime the holes with a hammer and a nail
10:57 AM Tom_L: i use a center punch or the tip of a tap
10:57 AM Tom_L: they're pretty pointy
10:58 AM Tom_L: https://www.amazon.com/General-Tools-79-Automatic-Center/dp/B00004T7RH
10:58 AM Tom_L: don't leave home without it :)
10:59 AM Tom_L: it'll pop your car window too if you ever end up in a lake
11:14 AM rue_: no I just got it on a foot
11:14 AM rue_: I use a high speed drill, carbide
11:15 AM rue_: ok, well, on the grounds that I'v been isolated for 10 days and have not turned into a ball of goo, they suggest I go back into work
11:16 AM rue_: and I got the battery charged back up in the work van, so I'm gonna head out, bye!
11:16 AM rue_: dont think I'll be doing many service calls tho
11:18 AM Tom_L: stay safe
11:18 AM Tom_L: they extended us til the 3rd
11:18 AM rue_: I'd sure love to get a test (its a horrid test)
11:19 AM Tom_L: pretty sure you'd know it by now
11:19 AM rue_: such is the idea
11:19 AM Tom_L: goin to cut a circle in that test piece for a skate bearing, see if it fits
11:20 AM Tom_L: i'm trying to remember if climb or conventional cut is best
11:21 AM Tom_L: gettin way too rusty
11:50 AM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Cube/Hole_test1.jpg
11:50 AM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Cube/Hole_test2.jpg
11:50 AM Tom_L: not a press fit but it's quite round
11:51 AM Tom_L: checked on the 90 deg and 45 deg sides
11:51 AM Tom_L: i didn't program it for a press fit...
01:19 PM aandrew: polprog: all you can really do is mark the 0.100" centers and try to hit them without wandering
01:21 PM aandrew: I have to do my research and see if you can "recondition" AGM batteries
01:21 PM aandrew: and if yes, if it's worth it
01:21 PM aandrew: $240 in batteries later. :-(
01:21 PM aandrew: 2x 14Ah and 2x 20Ah
01:22 PM aandrew: it pays to call around though, first place I called wanted $340 for the same
02:20 PM polprog: aandrew: thats my best bet, and to hit hard so the drill slides less
02:53 PM rue_: ok, well not lots going on at work, got some jobs billed and organized
02:54 PM rue_: if the plates are swolen, give up
02:54 PM rue_: you can also get a rough health by the self-discharge
02:54 PM rue_: if you charge it right up to 14V, and after a week its not atleast 12.8 standing, its shot
02:55 PM rue_: polprog, shall I video me doing a board?
02:58 PM rue_: I wish I were better at video editing, I swear I could make a cool short
03:08 PM polprog: sure!
03:32 PM rue_: ?
03:49 PM polprog: you should make a video about making boards
03:49 PM polprog: in my opinion
04:31 PM Tom_L: print, clean, iron, etch, drill, brag
04:32 PM polprog: pretty much
04:41 PM Tom_L: rue_, i think i'm fairly happy with the mill results now
05:03 PM rue_: how abuot just drilling them
05:03 PM rue_: dont want to set up the etching tank right now
05:08 PM rue_shop1: polprog, you have seen my page for it on the site, right?
05:08 PM polprog: i think i did, long time ago
05:08 PM polprog: "customer is inflicted with the final product"
05:14 PM rue_: yup
05:19 PM aandrew: rue_: none of these batteries are swollen
05:19 PM aandrew: well let's see if I can swap these batteries hot
05:20 PM aandrew: the 1000VA has a big connector on the back that I can use to disconnect the batteries
05:27 PM rue_: carefull, as I'm not sure all systems isolate the DC
05:32 PM aandrew: yeah I pussied out, mostly because I couldn't get the damned batteries out without completely removing the cover :-)
05:32 PM aandrew: so much for the 280 day uptime on that hackintosh
05:32 PM aandrew: gotta get a redundant power supply for that thing
05:32 PM aandrew: now to see if I remember the boot settings
05:33 PM aandrew: original batteries were 12Ah, these are 14, nice little boost
05:33 PM aandrew: but the old batteries are definitely ... rippley
05:33 PM aandrew: not swollen swollen but not new either
05:35 PM aandrew: sounds like something is rattling around in them too, which isn't normal
05:35 PM rue_: thats the salts
05:35 PM rue_: they dried out
05:36 PM rue_: all the stuff goes to the top, crystalizes, and breaks free
05:36 PM aandrew: interesting
05:36 PM rue_: if you suspect a battery bad, give it a good hard slap on a hard floor
05:36 PM aandrew: I'm not up on my lead acid battery tech
05:36 PM rue_: it'll break 'em loose and they rattle around
05:36 PM rue_: I did a few autopsies
05:37 PM rue_: drying out is the leading cause of death
05:37 PM rue_: you can actually go by weight
05:37 PM rue_: esp if you know the origional
05:37 PM rue_: that much water evaporates off
05:37 PM aandrew: wow
05:37 PM aandrew: even in sealed battery tech?
05:37 PM rue_: yup
05:37 PM rue_: they breathe
05:43 PM rue_: ...
05:43 PM aandrew: my batteries got teh covid
05:43 PM rue_: ?
05:43 PM rue_ is now known as rue_mohr
05:43 PM rue_mohr: la la la...
05:43 PM rue_mohr: much better
05:43 PM aandrew: huh, it booted right up but no mouse yet, I know this motherboard takes FOREVER to boot
05:43 PM rue_mohr: time for a new cmos battery?
05:43 PM rue_mohr: 3V, 14Ah?
05:43 PM rue_mohr: :)
05:43 PM aandrew: about 8 years ago I was using a Pentium 3-D system with 3GB of memory and had an FPGA contract and the stupid synthesis was taking like 30m
05:43 PM aandrew: that old machine was about 6y old at the time so I decided it was time to get a new one, I *hate* buying computer hardware
05:44 PM rue_mohr: and there is a module loader issue
05:45 PM rue_mohr: so I have to copy all the modules I want to install into the base dir of the modules tree
05:45 PM aandrew: man this machine is nice though, so happy with it, even these old monitors are awesome
05:45 PM rue_mohr: motor driver!
05:46 PM aandrew: yes, go drive motors
05:46 PM rue_shop1: I need to try to keep up with me
05:46 PM aandrew: I'll cheerlead from here :-)
05:46 PM aandrew: got my pompoms and everything
05:47 PM aandrew: GeForce GT730 - that was the video card I bought (along with a 1st-gen Ryzen system) for a contract I had with AMD that didn't go very well at all, unfortunately
05:48 PM polprog: https://www.techtales.com/tftechs.php?m=199803
06:04 PM aandrew: heh
06:04 PM aandrew: just a little modification
06:15 PM aandrew: huh
06:16 PM aandrew: the 1400VA UPSs batteries aren't swollen, but check out the negative side of the fuse: https://imgur.com/a/Am0BaW0
06:17 PM aandrew: black shit leaked all down the front of the battery
06:17 PM aandrew: and that screw is very, very tight
06:19 PM aandrew: it's only the one battery that's fucked in that one, that negative terminal got VERY hot
06:19 PM aandrew: I can't get it removed
06:26 PM aandrew: gonna have to replace that fuse holder, she's cooked
06:33 PM aandrew: https://www.digikey.ca/product-detail/en/littelfuse-inc/0498100-M/F3093-ND/553452 will do
06:36 PM aandrew: looks like the original is a "PAL" or "PAL Short" package
06:37 PM aandrew: https://www.mouser.ca/ProductDetail/Littelfuse/0PAL4100XP?qs=sGAEpiMZZMsh2y49K8ANrXgtX8Cl56UGyLql1z2ZMFA%3D specifically
07:06 PM aandrew: well.. placed an order with mouser. let's see if that ends up fucking me or not
07:06 PM aandrew: I wonder what caused that battery to cook
07:06 PM aandrew: I mean it is pretty toasted
07:26 PM rue_shop1: usually one will go sooner
07:26 PM rue_shop1: this apocalypse motor driver really impressed me, it was just fine at 70khz
07:27 PM rue_shop1: (its application is just on/off switching, no pwm)
07:52 PM aandrew: PWM won't really change much as long as you're under 70kHz :-)
07:53 PM aandrew: so, I've adjusted my hairstyle for the pandemic
07:53 PM aandrew: it's getting kind of long and shaggy and I can't stand it
07:54 PM aandrew: so I started combing it all back, Godfather style
07:55 PM rue_mohr: heh
07:55 PM rue_mohr: I suppose I build the motor driver now
07:55 PM rue_mohr: x2, wonder if I should etch it
07:55 PM aandrew: it makes me feel like I'm 70, but it's so much nicer than the Doc Brown look (which I couldn't pull off anyway)
07:56 PM rue_mohr: :)
08:26 PM rue_mohr: ok, 200khz should be approx 330uH and 2nF
10:42 PM MiniBat: exit
10:42 PM MiniBat: opp
10:42 PM MiniBat: oops
10:56 PM aandrew: hm
10:56 PM aandrew: I guess I need to revive an old project
10:56 PM aandrew: bought some tiny25s and some temp/humi sensors. I probably have some old stock but it'll take oto long to find them
10:59 PM aandrew: https://imgur.com/a/ZHBp8Fm
10:59 PM aandrew: that's a temp/humi/pressure sensor small enough to fit in the end cap of a copper pipe
11:00 PM aandrew: the tiny25 there is basically an i2c adc
11:07 PM aandrew: I built the first one with R2/R3 = 2k each and R1/R4 = 100k each. I assumed the gain would be 20 but it seems higher, near 50
11:28 PM zhanx_ is now known as zhanx
11:36 PM rue_mohr: hmm
11:36 PM rue_mohr: why the memory?
11:37 PM rue_mohr: er, no ok
11:37 PM rue_mohr: oh its the sensor
11:41 PM Tom_L: it was interesting when i installed cpuid on android and saw all the clusters of sensors it has on it
11:42 PM Tom_L: along with 7 cpu cores
11:43 PM rue_mohr: well, I dind't get the motor drivers built
11:43 PM rue_mohr: I got distracted, making oscillators
11:43 PM rue_mohr: cause, the boost supply I did for the motor drivers needed a 200kHz oscillator, that I did with a 555, but just wan't happy with
11:43 PM Tom_L: i tried messin with cutter comp a bit this evening and decided i shouldn't use it
11:44 PM rue_mohr: iirc that was the oppinion at trade school
11:44 PM Tom_L: i've never used it before either
11:44 PM Tom_L: just wanted to see
11:45 PM Tom_L: the circles however are nice and round
11:45 PM rue_mohr: its supposed to be used for left-right offset, but usually gets used for cutter wear?
11:45 PM Tom_L: i did another this evening after posting the first one
11:45 PM Tom_L: yes
11:46 PM Tom_L: did a couple tests while cutting the hole to clarify a few things for me
11:46 PM Tom_L: mods are best done in the cad cam
11:48 PM Tom_L: what are the motor drivers for? your big cnc?
11:51 PM rue_mohr: the tilt and pan mirror
11:51 PM rue_mohr: but on a realization from the cnc that motor drivers should be easier for me to do
11:51 PM rue_mohr: so I gotta work on that
11:52 PM Tom_L: so you still goin to work or nothing to do?
11:53 PM rue_mohr: there are a few things to take care of tommorow
11:53 PM rue_mohr: I'll see
11:54 PM rue_mohr: lunch is awkward so half days work for me
11:54 PM Tom_L: looks like i'm off at least til the 3rd
11:54 PM rue_mohr: you mentioned
11:55 PM Tom_L: i forgot..
11:55 PM Tom_L: so little going on it gets hard to even remember what day it is
11:56 PM rue_mohr: yep
11:56 PM rue_mohr: drive to work and back, see what you remember that you wanted to get done at home
11:57 PM Tom_L: partially why the mill got a tune up
11:59 PM rue_mohr: I wonder if 200khz is unreasonable to try to hit with a transistor/transformer osc