#garfield Logs

Mar 23 2020

#garfield Calendar

01:18 AM polprog: good morning
01:45 AM rue_shop1: good night
01:46 AM rue_shop1: after severe modification I got the inductor meter going
01:46 AM rue_shop1: good thing they described the underlying idea
01:54 AM rue_mohr: so, a 12V 7Ah battery would keep a 4w UV lamp running for about 20 hours
01:55 AM rue_mohr: 5Ah would last about 10 hours
01:55 AM rue_mohr: ok
01:55 AM rue_mohr: li-ion is 3s
01:55 AM rue_mohr: cell phone batteries are about 1Ah
01:56 AM rue_mohr: so, 3S4P
01:56 AM rue_mohr: 12 batteries
02:05 AM polprog: making an emergency sterilizing beacon?
02:06 AM rue_mohr: I got a diving mask
02:06 AM rue_mohr: and some 4W UV lamps
02:07 AM rue_mohr: air doesn't need to be filtered clean
02:07 AM rue_mohr: needs to have viri killed
02:09 AM polprog: hmm, sounds like an interesting project
02:10 AM polprog: remember that O3 is not healthy in big amounts
02:10 AM polprog: iirc UV lamps cause it to appear
02:11 AM rue_mohr: yup
02:11 AM rue_mohr: have to work out a uv "air filter" design
02:12 AM rue_mohr: wow midnight snuck up quick
02:12 AM rue_mohr: zhanx, so they locked down NY?
02:13 AM rue_mohr: man, NY is having a hell of a year
02:14 AM rue_mohr: so I need to make a power supply that takes 12V and produces 14vac
02:14 AM rue_mohr: freq doesn't matter
02:18 AM rue_mohr: with a very low dose of 2 mJ/cm2 of 222-nm light inactivating >95% of aerosolized H1N1 influenza virus
02:18 AM rue_mohr: ""
02:20 AM rue_mohr: I wonder how I convert mJ/cm^2 to watts
02:20 AM rue_mohr: guess I need to come up with an area
02:20 AM rue_mohr: and time
02:21 AM polprog: hmm, mJ of light, youd have to measure it
02:22 AM polprog: after that it's simple
02:22 AM rue_mohr: 4W is 4J/s
02:23 AM rue_mohr: so, lets say 4mJ/cm^2
02:23 AM rue_mohr: er, back up, lets say the exposure time is 100ms
02:23 AM rue_mohr: so I have 400J
02:24 AM rue_mohr: 100cm^2
02:24 AM rue_mohr: if I have a circular chamber 40mm dia
02:24 AM rue_mohr: circ is 12.56
02:25 AM rue_mohr: so an ~8cm chamber
02:25 AM polprog: if you measure the lumens or lux, and know the luminous efficiency (lumens / W ) it get's easy
02:25 AM rue_mohr: ouch
02:25 AM rue_mohr: right
02:25 AM polprog: photometry units are a pain
02:26 AM polprog: The corresponding unit in English and American traditional units is the foot-candle.
02:26 AM polprog: from https://en.wikipedia.org/wiki/Lux
02:27 AM polprog: im waiting to learn that there is more than 1 definition of a candle
02:28 AM rue_mohr: ok, well, assuming that the UV lamp is better than 50% efficient (!? :S)
02:28 AM rue_mohr: I wonder what volume I breathe
02:28 AM polprog: couple liters?
02:28 AM rue_mohr: cause I'm working with ~100cm^3 of air IN the chamber
02:29 AM polprog: >Tidal volume (symbol VT or TV) is the lung volume representing the normal volume of air displaced between[clarification needed] normal inhalation and exhalation when extra effort is not applied. In a healthy, young human adult, tidal volume is approximately 500 mL per inspiration or 7 mL/kg of body mass.[1]
02:29 AM rue_mohr: as long as I dont inhale more than 100cm^3/100ms I'd be ok
02:31 AM rue_mohr: it looks like I take about 4 seconds to calmly inhale
02:32 AM rue_mohr: ok, so
02:32 AM rue_mohr: that filter could handle 1L/s
02:32 AM rue_mohr: and I'm about 0.125L/s
02:33 AM rue_mohr: numbers are looking good
02:35 AM rue_mohr: so
02:35 AM rue_mohr: a good question is how to deal with O3
02:38 AM rue_mohr: hahah with uv light
02:38 AM rue_mohr: These lamps will produce UV light with two peaks in the UV light band, one at 254 nm, and another at 185 nm. The 185 nm light is what is referred to as an “ozone producing” lamp, while the 254 nm light is referred to as a “germicidal” lamp.
02:38 AM rue_mohr: BINGO
02:39 AM rue_mohr: thats why the SAME BULB on aliepxress is sold as ozone and no ozone
02:42 AM rue_mohr: ouch
02:42 AM rue_mohr: https://lamptech.com/f4t5blb-4w-6-fluorescent-black-light-blue/
02:42 AM rue_mohr: I have two of these
02:42 AM rue_mohr: their from money checkers at the bank
02:42 AM rue_mohr: 4W lamp, 0.5W UV output
02:42 AM polprog: i was thinking about one like that as a utility lamp
02:42 AM polprog: for when i need to illuminate something in UV
02:43 AM polprog: but im sure this is not germicidal, the transparent ones are
02:43 AM rue_mohr: but its got a coating on the inside
02:43 AM rue_mohr: if its not flourescent, its not germicidal
02:43 AM rue_mohr: the arc generates the uv
02:44 AM polprog: bigclive made a video about that
02:45 AM polprog: https://blog.lightbulbs-direct.com/choosing-ultraviolet-bulbs-the-difference-between-uva-uvb-and-uvc/
02:46 AM polprog: bloody sun
02:46 AM polprog: go away
02:46 AM rue_mohr: https://www.aliexpress.com/item/33029128394.html
02:47 AM rue_mohr: thats the right type, mine are filtered
02:47 AM polprog: that's right
02:48 AM rue_mohr: I think the price of them went up 20x since I last looked
02:49 AM polprog: portable UVC torch, how lovely
02:49 AM polprog: https://www.aliexpress.com/item/4000774727679.html
02:49 AM polprog: OSHA likes it
02:50 AM rue_mohr: https://www.bulbtown.com/G4T5_4_Watt_T5_Germicidal_Bulb_G5_Base_p/g4t5.htm <-- ad warning
02:56 AM polprog: https://www.youtube.com/watch?v=1m0TQjBRcFo
02:57 AM polprog: "if it did get shipped to the wrong address and they opened it up and thought "oooh, a free lamp" they are in for a really bad education"
03:00 AM rue_mohr: yup, I need battery powered tho
03:08 AM rue_mohr: sooo
03:08 AM rue_mohr: datasheets say
03:08 AM rue_mohr: the 4W bulbs put out about 1W of uvc
03:08 AM rue_mohr: I'm still ok tho
03:23 AM polprog: http://russellsrandomthoughts.blogspot.com/2013/05/the-gtl3-bulb-simple-and-inexpensive.html this ones neat
03:23 AM polprog: 10V
03:29 AM rue_mohr: http://mixdown.ca/~andrew/analog.html#fastopto
03:29 AM rue_mohr: those are the ones I got
03:29 AM rue_mohr: I got like 6 from different suppliers
03:34 AM polprog: nice
03:34 AM polprog: i should pull off optos from the atx boards
03:34 AM polprog: i have 30 mins before the lecture starts, ill do it now
03:34 AM polprog: The buffered versions include two or more inverters within the device itself and the output ends up bouncing a bit before settling on the new value.
03:34 AM polprog: interesting
03:35 AM polprog: (from the schittifying a non schmitt buffer) section
03:35 AM rue_bed: ah, you got the logic ones working!
03:35 AM polprog: no, not yet
03:36 AM polprog: i mean, i have them beeped out on the dmm and the pinouts worked out
03:53 AM polprog: i got an 817C opto
04:07 AM polprog: lol the max forward current of the diode in the 817C is 10mA higher than the max output current
05:02 AM Tom_L: morning
09:41 AM rue_mohr: hi
10:45 AM Tom_L: hi
10:56 AM polprog: cant wait to be over with errands and try my new circuit
10:57 AM Tom_L: what's it do?
11:03 AM polprog: 74hc14 quantifier
11:03 AM polprog: started as a crude level indicator.. but i realized it doesnt need to have leds on the outputs
11:03 AM polprog: quantifier? or quantizer
11:04 AM polprog: quantizer.
11:05 AM rue_mohr: remember that the levels for 74HC14 and 74LS14 are totally different
11:06 AM rue_mohr: I was working on building an inductor tester from the books there, their 74HC14 oscillator did NOT work
11:06 AM rue_mohr: HC or LS
11:07 AM polprog: HCT actually
11:08 AM polprog: i think i noticed (havent actually checked in practice or the datasheet) that my hct14 triggers at a very low voltage
11:21 AM polprog: ha, just found an error in it..
11:21 AM polprog: on paper
11:41 AM rue_mohr: :)
11:42 AM rue_mohr: yesterday I also found that between the levels, the HC chip I had was behaving verry linear
11:42 AM rue_mohr: which might expalin why they seem to suck for making oscillators
11:42 AM rue_mohr: the LS have the pullup resistor, and that messes them up for oscillators
11:48 AM polprog: i need to try the 74hc04
11:48 AM polprog: not hct
11:48 AM polprog: i had the architectural differences saved somewhere
11:48 AM polprog: bbl. errands
06:18 PM polprog: damnit
06:18 PM polprog: midnight
06:19 PM polprog: maybe its better that i take a break for a day from this
06:19 PM polprog: i need a curve tracer.. i think i can easily make one this week
06:19 PM polprog: if i had enough drive i could even etch it
06:23 PM rue_mohr: its just an AC transformer and a resistor
06:23 PM rue_mohr: ... you know that right?
06:24 PM rue_mohr: the 12VCT transformer you get from smashing your alarm clock to peices is quite sufficient
06:27 PM polprog: hmm
06:27 PM polprog: i was thinking more of a triangle signal gen
06:27 PM rue_mohr: nope
06:28 PM polprog: was hoping for it to be DC operated
06:28 PM rue_mohr: any bipolar source, cause its xy, is just fine
06:28 PM polprog: ok
06:28 PM polprog: makes sense
06:28 PM polprog: still, id like to keep it as solid state as possible...
06:28 PM rue_mohr: easiest is just a good ole plug in transformer and a voltage-output current sensor (resistor)
06:28 PM rue_mohr: you can make a pcb for the one resistor you need
06:29 PM polprog: i think i coulld make a small single opamp one
06:29 PM rue_mohr: you can even bolt the transformer to it!
06:29 PM polprog: i want it to run off DC
06:29 PM polprog: yeah... ill try to make that
06:34 PM rue_mohr: why battery powered?
06:35 PM polprog: i am short on wall sockets
06:35 PM polprog: so to speak
06:35 PM polprog: i have to unplug stuff non stop
06:35 PM rue_mohr: you testing parts off the tv's smashed in the alley BEFORE you bring them home?
06:35 PM polprog: lol
06:35 PM polprog: field curve tracer for the average scrap hunter
06:35 PM rue_mohr: I cant find pipe for my isolation helmet...
06:35 PM polprog: ??
06:36 PM rue_mohr: tell me if you have heard this story
06:36 PM rue_mohr: when I was a kid, walking to school every day
06:36 PM rue_mohr: there was, one day, a broken tv at the side of the street
06:36 PM rue_mohr: I walked by that tv for a week pondering if there was anything in it that I wanted
06:36 PM rue_mohr: then one day it hit me
06:37 PM rue_mohr: that there wasn't anything in that tv I wanted, and I'd just walked by it for a week
06:37 PM rue_mohr: if there had been ANYONE who wanted parts from the tv, I'd have missed my chance
06:37 PM rue_mohr: but _I_ was the only one
06:38 PM polprog: holy crap
06:38 PM rue_mohr: I took to pondering what a world would be like where I'd have to fight for the flyback core, or the audio amp..
06:38 PM rue_mohr: it made me kinda sad
06:38 PM polprog: when i was 10 i found a smashed TV... in the back alley of the part
06:38 PM polprog: park*
06:39 PM rue_mohr: did you get anything from it?
06:39 PM polprog: actually.. reminds me when i found two perfectly working SIMMs in the fort
06:39 PM rue_mohr: :)
06:39 PM polprog: no, it was before i knew what to take
06:39 PM polprog: DAMN
06:39 PM polprog: im stupid
06:39 PM polprog: last summer i was urbexing and there was a CRT monitor baseplate with all the goodies
06:39 PM polprog: i mean
06:39 PM polprog: the PCB
06:39 PM polprog: where all the stuff is
06:40 PM polprog: HV transistors :(
06:40 PM rue_mohr: hey, the cathode drivers are REALLY high freq transistors
06:40 PM polprog: yea
06:40 PM rue_mohr: like, 1Ghz
06:40 PM polprog: i only took a bunch of telephone wire
06:40 PM polprog: it was curled in a ball
06:40 PM polprog: still use it
06:40 PM polprog: for breadboard jumpers
06:40 PM rue_mohr: yep
06:41 PM polprog: having said that.. ill be on the lookout
06:41 PM rue_mohr: I got a bunch of 24 guage I use
06:41 PM rue_mohr: iirc normal is 26?
06:41 PM rue_mohr: one guage higher anyhow,
06:41 PM polprog: there is a bidding on a chassis-less tek waveform monitor for 99pln
06:41 PM polprog: about 20-30 usd
06:41 PM polprog: im considering it
06:43 PM rue_mohr: dishwasher drain hose!
06:43 PM polprog: the hobos in the fort collect all sorts of electronics
06:43 PM rue_mohr: what I need is an auto wrecker!
06:43 PM rue_mohr: hah
06:43 PM polprog: theres a lair where ive seen about 10 phones worth in parts
06:43 PM polprog: like literally
06:43 PM rue_mohr: YOU STOLE THEIR WIRE!
06:43 PM polprog: you walk a trail and there are nokia batteries scattered
06:43 PM polprog: lol
06:44 PM rue_mohr: blimped or ok?
06:44 PM polprog: nah, the wire was a different dump :D
06:44 PM polprog: none of them were puffy
06:44 PM rue_mohr: not puffy = ok
06:44 PM polprog: but im not touching that, esp now with the covid stuff
06:44 PM rue_mohr: 0V likley means lockout, charge and fine
06:44 PM polprog: they all had rusty contacts
06:44 PM rue_mohr: fair enough
06:44 PM polprog: hmm, good tip
06:44 PM rue_mohr: you need a suit
06:45 PM rue_mohr: if they were flooded their done
06:45 PM polprog: the nokia 3310 batteries are pretty universal actually. ive seen some devices use these
06:46 PM polprog: ive pulled about 5 1n4148 from the random PCBs in the scrap box
06:46 PM polprog: these will come in useful now
06:46 PM polprog: i need 6 for my quantizer
06:46 PM rue_mohr: I suggest take parts as you need them
06:46 PM polprog: i do
06:47 PM rue_mohr: otherwise its too much trouble
06:47 PM polprog: i remove all the tall things and then throw the PCB into the box
06:47 PM polprog: yeah. no point in proactively pulling stuff off
06:47 PM polprog: it's not *that* bad here yet :D
06:48 PM polprog: on topic of electronic scavenging
06:48 PM polprog: i wonder how difficult would it be to convert one of these temperature controlled vapes into a portable iron
06:50 PM rue_mohr: why not just make an iron?
06:50 PM rue_mohr: 40w... 4.3V
06:51 PM rue_mohr: zippo:/files/programming/c/tests# ohm -p 40 -v 4.3
06:51 PM rue_mohr: Power is: 40.000W
06:51 PM rue_mohr: Current is: 9.302A
06:51 PM rue_mohr: Voltage is: 4.300V
06:51 PM rue_mohr: Resistance is: 462.250mOhms
06:51 PM rue_mohr: You have new mail in /var/mail/root
06:51 PM polprog: you get a temperature controller and a driver for a low resistance load already
06:51 PM polprog: small pocket form factor
06:51 PM polprog: if only these hit 250 C
06:52 PM polprog: i dont know , i dont smoke
06:52 PM rue_shop1: my fav iron is 50W
06:52 PM rue_shop1: but I have a bunch of AWESOME cheap ones that are only 20
06:53 PM polprog: hmm
06:53 PM rue_shop1: its all about how their made
06:53 PM polprog: i dont remember how powerful my hakko clone is
06:53 PM polprog: but for heavier ground fills i have to break out the transformer one
06:53 PM rue_shop1: mine uses hakko parts
06:53 PM polprog: i also have a generic one for spares..
06:53 PM rue_shop1: I had to replace the controller,... its a hako :)
06:54 PM rue_shop1: yea
06:54 PM rue_shop1: I have a gun I use for the big stuff
06:54 PM polprog: this random online picture says YCD-936D is 60W
06:55 PM polprog: https://www.youtube.com/watch?v=XrUjhFUm8OM
06:55 PM polprog: hmm, the video description
06:55 PM rue_shop1: mines based on the 936
06:55 PM rue_shop1: I was looking at irons from china
06:55 PM polprog: im using a UK-EU adapter, might not be grounded actually
06:55 PM polprog: rpi
06:55 PM polprog: rip*
06:55 PM rue_shop1: realized that the pens are cheap as all hell, and that the power supplies were a fortune
06:55 PM rue_shop1: but replacement controllers were cheap
06:56 PM rue_shop1: so I bought a pen and controller, made my own box w/transformer
06:57 PM polprog: good, it is grounded
06:57 PM polprog: i just realized i unplugged my rigol at some point
06:58 PM rue_shop1: I wonder where a person could find a good 462 ohms of small nichrome wire
07:03 PM polprog: i have some IR receivers scavenged
07:03 PM polprog: these could also make something of an encoder along with IR leds
07:10 PM rue_mohr: they have quite particular specs
07:11 PM rue_mohr: the modulation has to be right, and you cant go over duty or period
07:11 PM rue_mohr: cause they use agc and it freaks out easy
07:11 PM rue_mohr: I presume you mean the modulated ones?
07:12 PM polprog: i dont know. black plastic, led like case, 3 legs
07:12 PM polprog: i suppose its just the same detector in a different case
07:12 PM rue_mohr: oh ok
07:13 PM rue_mohr: the modulated ones have a metal shield over them
07:14 PM polprog: im thinking the next gauge version will be quadrature
07:14 PM polprog: i cant get below these 2mm sensibly
07:14 PM rue_mohr: you have to make a mask
07:15 PM rue_mohr: can you etch copper?
07:15 PM polprog: not copper clad i presume
07:15 PM rue_mohr: yea, copper clad
07:15 PM polprog: oh
07:15 PM polprog: i mean
07:15 PM polprog: copper sheets or copper on PCB material
07:15 PM rue_mohr: copper clad blocks uv light*
07:16 PM rue_mohr: *the copper part for levels of IR below 1MW/m^2
07:16 PM rue_mohr: sorry, Imeant ir
07:16 PM rue_mohr: I'm workong on a uv thing
07:17 PM polprog: i think its easier to stick to 2mm wide bars and just make them quadrature
07:17 PM rue_mohr: you know how vernier scale works?
07:18 PM polprog: more less
07:18 PM rue_mohr: quadrature is just the minimum case for that
07:18 PM polprog: hmm, i just had something like that come to my mind
07:18 PM rue_mohr: if you make a grate that spans 10 lines with 9 slots
07:19 PM rue_mohr: you can have a lot more resolution
07:19 PM polprog: ill try quadrature first
07:19 PM polprog: well, first id like to get a sensible, stable signal of what i have now
07:19 PM rue_mohr: how come that circuit isnt' working right for you
07:20 PM polprog: i have no idea
07:20 PM polprog: it was working fine for a moment when i put a small piece of plastic perpendicular to the head, to cast shadow
07:21 PM polprog: it would then drop 1 or 2 bars per a test program cycle (0 - 5 - 0 - 10 - ... - 50 - 0)
07:21 PM rue_mohr: I need to sleep again
07:21 PM Tom_L: rue_mohr, my local guy used to have rolls of nichrome wire
07:21 PM Tom_L: all sizes
07:22 PM Tom_L: too bad he's gone now
07:22 PM rue_mohr: yup
07:22 PM Tom_L: ribbon and wire
07:22 PM rue_mohr: might be able to zerp it from a ceramic block resistor
07:22 PM Tom_L: toaster
07:22 PM Tom_L: portable heater
07:22 PM Tom_L: iron
07:22 PM Tom_L: crock pot
07:22 PM rue_mohr: yes, and no
07:23 PM rue_mohr: I know that the wire in a hair dryer is too big
07:23 PM polprog: ok, i think ill hit the bed
07:23 PM Tom_L: well damn
07:23 PM rue_mohr: toaster is too big too
07:23 PM Tom_L: just as i show everybody goes to sleep
07:23 PM rue_mohr: I'm falling asleep,but I havn't told ya yet
07:23 PM polprog: id stay but i have to be up and sane at 10 am
07:23 PM rue_mohr: designing a germicidal helmet
07:24 PM rue_mohr: /antiviral
07:24 PM Tom_L: brb
07:24 PM rue_mohr: I need dishwasher drain hose
07:46 PM Tom_L: mmm
07:46 PM Tom_L: car heater hose big enough?
08:19 PM rue_mohr: waaaay too big
08:21 PM Tom_L: not radiator silly
08:21 PM Tom_L: heater
08:21 PM Tom_L: 5/8"
10:12 PM rue_mohr: too stiff
10:12 PM rue_mohr: I'm looking for something light
10:13 PM Tom_L: plastic electrical conduit?
10:13 PM Tom_L: somewhat flexible
10:14 PM Tom_L: and you should have some :)
10:20 PM rue_shop1: :)
10:20 PM rue_shop1: lighter, I think the dishwasher drain pipe is just right, or the similar sized corrigated pipe used for aquariums
10:21 PM Tom_L: i used clear tube on mine
10:21 PM Tom_L: poly?
10:21 PM Tom_L: it's kinda stiff too though
10:22 PM rue_shop1: there is corrigated stuff, not sure on what it is, or I'd have found some to buy
10:23 PM Tom_L: they also make that with a slit down the side of it to use for wire protection
10:23 PM Tom_L: but you don't want the slit
10:23 PM rue_shop1: yea
10:23 PM rue_shop1: i know they make it not split too
10:25 PM Tom_L: also comes in 4" diameter
10:25 PM Tom_L: drain pipe
10:25 PM Tom_L: https://www.amazon.com/Corrugated-Plastic-Flexible-Conduit-Tubing/dp/B07GCZ12PW
10:26 PM Tom_L: good luck getting anything from amazon now
10:26 PM Tom_L: 10mm
10:26 PM Tom_L: too big?
10:28 PM rue_mohr: I want about 1"
10:30 PM Tom_L: what about clear vinyl?
10:31 PM rue_mohr: I dont really care about the material
10:31 PM rue_mohr: clear is what I'v got in mind
10:31 PM Tom_L: garden hose
10:31 PM rue_mohr: too stiff
10:32 PM Tom_L: vinyl
10:32 PM rue_mohr: light and flexible
10:32 PM rue_mohr: I dont really care about the material
10:32 PM Tom_L: https://www.mcmaster.com/plastic-food-grade-tubing
10:32 PM Tom_L: i used clear vinyl on a fishtank years ago
10:32 PM rue_mohr: too stiff
10:32 PM rue_mohr: I'm looking for the thin corrigated stuff
10:33 PM rue_mohr: actaully
10:33 PM rue_mohr: https://www.mcmaster.com/corrugated-tubing
10:33 PM rue_mohr: like that
10:34 PM rue_mohr: I dont know how stiff that particular stuff is
10:34 PM rue_mohr: probably too stiff, cause its rated 50psi
10:35 PM rue_mohr: I'm looking for stuff that I'd expect rated at like 5 psi
10:35 PM Tom_L: the one on the right?
10:35 PM Tom_L: the left one is electrical
10:35 PM Tom_L: the center one is steel
10:35 PM rue_mohr: oh damn them
10:35 PM rue_mohr: https://www.mcmaster.com/compression%20tube%20fittings%20for%20Teflon%20FEP%20plastic%20hard%20tubing
10:36 PM rue_mohr: di that work?
10:36 PM rue_mohr: nope, damnit
10:36 PM Tom_L: depends what i'm looking at
10:36 PM rue_mohr: bad site, cant give you a link
10:36 PM rue_mohr: I cant link you to what I'm looking at
10:36 PM Tom_L: what about that hdpe? crap they use for water lines
10:36 PM rue_mohr: its clear corrigated pipe
10:37 PM rue_mohr: from 1/4" to 2" they bring up a chart
10:37 PM rue_mohr: bit its WAY too expensive
10:37 PM rue_mohr: they want like $15/foot atleast
10:38 PM Tom_L: try a local hardware store
10:38 PM rue_mohr: they use it for little water hand pumps
10:38 PM rue_mohr: cheap squeezie ones
10:38 PM rue_mohr: dunno if any of the stores are open
10:38 PM rue_mohr: arg
10:39 PM Tom_L: you picked a fine time to start a project!
10:39 PM rue_mohr: its an antiviral mask, its not my normal type of project
10:40 PM rue_mohr: this started in china, 2 days later its in italy, then next day its in canada
10:40 PM Tom_L: i figured that's what it was about
10:40 PM rue_mohr: if I'd known I'd have been making them since jan
10:40 PM Tom_L: my kid gets those from his work
10:40 PM rue_mohr: yea I blinked and the world had it
10:41 PM rue_mohr: I'm not going for a mechanical filter
10:41 PM rue_mohr: I'm going for a UVC filter
10:41 PM Tom_L: M95 mask is what you're after
10:41 PM rue_mohr: got one
10:41 PM Tom_L: the use them in the debur shop at his work
10:41 PM rue_mohr: want a sealed UVC protected mask
10:42 PM rue_mohr: well I have N95
10:42 PM rue_mohr: I have a few
10:42 PM Tom_L: N is what i meant
10:42 PM rue_mohr: funny enough, about 3 weeks ago, I bought a box of the cheap paper masks at the building store
10:42 PM rue_mohr: I'd have picked up the good ones if I'd known this was on the horizon
10:42 PM Tom_L: they say the mask won't help much
10:43 PM rue_mohr: yes and no
10:43 PM rue_mohr: virus filters can get thru, but the dropletts their riding on cant
10:43 PM Tom_L: cleanliness is next to godliness
10:43 PM rue_mohr: but thats why I'm planning to make a UVC filter
10:43 PM rue_mohr: I
10:43 PM Tom_L: 4oz bleach to 1 gal water
10:43 PM rue_mohr: zhanx, ?
10:43 PM Tom_L: spray everything
10:44 PM Tom_L: let it sit 10 min or it's not effective
10:44 PM rue_mohr: yea, do I already have it? I dont know, I'm ill
10:44 PM Tom_L: who you been around?
10:44 PM Tom_L: it's not just gonna jump down your throat
10:44 PM rue_mohr: well I went out shopping last wed
10:44 PM rue_mohr: and I got my hair cut
10:44 PM Tom_L: keep distances
10:45 PM rue_mohr: and I was working at the SEWER PLANT
10:45 PM rue_mohr: yea
10:45 PM Tom_L: but what were you doing 14 days ago
10:45 PM Tom_L: ish
10:45 PM rue_mohr: they had a sensor line to a motor fail
10:45 PM rue_mohr: hey good point
10:46 PM rue_mohr: working at the university, running wire
10:46 PM Tom_L: alone?
10:46 PM Tom_L: in a class of idiot college kids?
10:47 PM rue_mohr: interacted with *almost* nobody (accept my co-worker), there were two guys from out of town installing a tv
10:47 PM Tom_L: doubtful you caught anything
10:47 PM Tom_L: i may wear nitril gloves tomorrow
10:47 PM rue_mohr: day after, university again, and fixing up a phone line in the local pot dispensery
10:48 PM Tom_L: after that we may be shut down
10:49 PM rue_mohr: I dont think I have it, there were almost no cases locally about 2 weeks ago
10:49 PM rue_mohr: but it spreads faster than wildfire, so
10:49 PM Tom_L: just annual allergies
10:49 PM rue_mohr: I'm not allergic
10:50 PM Tom_L: btw don't take motrin
10:50 PM rue_mohr: but I dont have to be, the polen here is thick as all hell
10:50 PM Tom_L: it accelerates it
10:50 PM Tom_L: tylenol
10:50 PM Tom_L: use that
10:50 PM rue_mohr: it would be a good way to tell tho!
10:50 PM Tom_L: to combat fever
10:50 PM rue_mohr: I had one day that I might have had a fever, but I'm not sure
10:50 PM Tom_L: you would likely still have it
10:51 PM rue_mohr: this is good, cause I definitly dont
10:51 PM rue_mohr: the cat seems ill
10:51 PM rue_mohr: one of them
10:51 PM Tom_L: the thing is.. you buy a white car and for a while all you notice is white cars all around
10:52 PM rue_mohr: hard to tell when they just lie around all day, but I can see it
10:52 PM Tom_L: same idea
10:52 PM rue_mohr: totally
10:52 PM rue_mohr: I should go set off the UVC germ lamp in the spare room
10:53 PM Tom_L: all this purell is dryin the shit outta my hands
11:04 PM rue_mohr: https://www.aliexpress.com/item/32961135441.html
11:04 PM rue_mohr: I got a few of these to use in my UVC filters
11:05 PM rue_mohr: I have some longer ones
11:05 PM rue_mohr: but I dont think their the right spectrum
11:05 PM Tom_L: i had one on my saltwater tank
11:06 PM Tom_L: the ones i have for curing my UV paint, you can smell the ozone caused from them
11:07 PM rue_mohr: yep
11:07 PM rue_mohr: run them in your empty rooms for a bit
11:07 PM rue_mohr: those'll kill everything right fast
11:08 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/boards/USBTiny_Mkii/silkscreen/silk_batch_cure.jpg
11:08 PM Tom_L: 2 bulbs under there
11:08 PM rue_mohr: yup
11:08 PM rue_mohr: makes my eyes feel gritty just lookin at it
11:09 PM Tom_L: almost forgot i had those
11:10 PM rue_mohr: hit up the stuff from the grocery store
11:11 PM Tom_L: i suppose if you put them in the return air duct the air flow would be too fast
11:11 PM rue_mohr: +-
11:11 PM rue_mohr: percentage improvement is improvement
11:12 PM rue_mohr: I'm deisgning for a 100ms exposure time
11:12 PM rue_mohr: with that discharge lamp
11:12 PM rue_mohr: at really close prox
11:13 PM Tom_L: they're also used in smaller applications like women's nail curing
11:13 PM Tom_L: uv paint
11:13 PM rue_mohr: yea, not UVC
11:14 PM rue_mohr: I dont think leds put out nearly enough punch to matter
11:22 PM rue_mohr: so the small UV lamps I have are 0.5w output 4W input, 365nm
11:22 PM rue_mohr: yea, UVA
11:23 PM Tom_L: gnite
11:24 PM rue_mohr: gnight