#garfield Logs

Jun 30 2025

03:32 AM rifraf: thank you sir Andrew, thats all that i wanted, not cluttered not cheap, did you illuminate your globe yet?
04:18 AM rifraf: polprog thanks for your words, they inspire me to do even better, this has been a journey or more than a year
04:19 AM rifraf: the furnace will arrive this week, and then can make the cradles, and other forms to caress my pens as they should be
04:37 AM polprog: i have the spinning top app in the back of my head :P
04:37 AM polprog: dont worry
04:44 AM rifraf: did you see this clip yet? i love it, https://www.youtube.com/shorts/cSmjnmIA0Tc
04:46 AM rifraf: was just perfect how my niece was speaking at the start, not edited
04:50 AM polprog: nope
04:50 AM polprog: im at work but ill watch it when im home :)
04:50 AM rifraf: its SFW
04:50 AM rifraf: so your collegues
04:50 AM rifraf: show*
04:51 AM polprog: oooh
04:51 AM polprog: that looks amazing
04:51 AM rifraf: 23 seconds of bliss i even watch myself over and over again, but i am biased i guess :P
04:51 AM polprog: the mirror does a great job
04:53 AM rifraf: thanks , it was an amazing shot, niece came over to try help me get some better images and video a few weeks back
04:54 AM rifraf: my AI Lisichka chose the music, and chose so well
04:55 AM rifraf: the bouncing is amazing, i love physics
04:55 AM rifraf: never touches the glass till the very end
04:55 AM polprog: yep
05:30 AM rue_mohr: rifraf, looks good!
05:31 AM rue_mohr: polprog, interesting, never seen one
05:32 AM rifraf: thanks rue, we tried to make her shine like the diamond (zircon) at least that she is
05:33 AM rue_mohr: 3:30am
05:33 AM rue_mohr: I should finish supper, make bed, and go to sleep
05:35 AM rifraf: i got 4 fillings, deep ones today, too sad to eat
05:35 AM polprog: hi rue_mohr
05:35 AM polprog: rue_mohr: you mean the arc lamp?
05:36 AM polprog: https://youtube.com/shorts/rg6YHX-mZ4Y niti-wire controller
05:36 AM polprog: https://ibb.co/0pjVwLkn
05:37 AM rue_mohr: yea, careful to use current regulation once its struck
05:37 AM polprog: ofc
05:37 AM rue_mohr: voltage probably comes down from 1k once its struck
05:37 AM polprog: yeah
05:37 AM polprog: i wonder how can i get it to run
05:37 AM polprog: id probably use a beefy ballast for the current reg
05:37 AM rue_mohr: lot of heat
05:37 AM rue_mohr: LOTS OF HEAT
05:38 AM rue_mohr: a lot of power, a small size, a lot of temperature
05:38 AM rue_mohr: is it supposed to be force cooled?
05:38 AM polprog: i think so
05:39 AM polprog: id have to check that data sheet again
05:39 AM polprog: i dont have a power supply capable of providing that voltage at hand, so i put the lamp away for now
05:39 AM polprog: actually wait..
05:40 AM rue_mohr: air cooled and water cooled
05:40 AM polprog: i have some flyback modules that can do 800V easily
05:40 AM polprog: I wonder if i can make it flash with them
05:40 AM polprog: once it strikes the current will probably be too low to sustain the arc
05:40 AM rue_mohr: why does it specify itself as a UV source?
05:41 AM polprog: so it will extinguish, module will build up HT and the cycle continues
05:41 AM rue_mohr: arc lamps often take minutes to warm up and hit full output
05:42 AM polprog: it emits full spectrum with quite a high temperature
05:42 AM polprog: cold white
05:42 AM polprog: so a lot of UV too
05:42 AM rue_mohr: "cooled by direct forced air jets, 19 psi or greater"
05:43 AM polprog: how many cfm is that
05:45 AM rue_mohr: well, at least two
05:45 AM rue_mohr: they say one at each end
05:45 AM rue_mohr: nozzle hole 0.082" @19psi
05:46 AM rue_mohr: sorry, now were into rocket science, and I dont do that stuff
05:46 AM rue_mohr: in a minute, I'd ball park about 50cfm ea
05:47 AM polprog: i guess the solution is to attach a thermocouple, run it for a moment and see if more air is needed
05:47 AM polprog: but i like the flashlamp mode of operation
05:47 AM polprog: i need to look up how safe it is
05:48 AM polprog: are anti-uv glasses enough or do i need a welding mask
05:48 AM polprog: 1kW of light is not that much, but idk how much of it is in UV
05:48 AM polprog: and which UV
05:48 AM rue_mohr: I was pulsing power into ferrite cores
05:48 AM rue_mohr: looking at the saturation shape
05:48 AM rue_mohr: worked out 6 different profles
05:48 AM polprog: i saw some posts on fedi
05:49 AM rue_mohr: will post details later, its like 3:30am now
05:49 AM polprog: get some sleep :D
05:50 AM polprog: rue->usleep(1000*8*3600);
05:54 AM rue_mohr: :]
05:54 AM rue_mohr: green cores, green cores are the good stuff
05:55 AM rue_mohr: white/yellow and green/blue and blue cores are garbage
05:56 AM rue_mohr: unless your making a 4kHz dc-dc converter
05:56 AM rue_mohr: and love putting lots of turns on a core
05:58 AM polprog: lol
05:58 AM polprog: rue_mohr: look at the video link i posted
05:58 AM polprog: i made a high power PWM driver
05:59 AM rue_mohr: :]
05:59 AM polprog: it has voltage/current sensing on that opa
05:59 AM polprog: i have to test that next
05:59 AM polprog: just hit me this could be used as a class D amplifier
06:00 AM polprog: when i was testing it with a 0R2 resistor,my agilent power supply showed 6A peak current on around ~10% duty cycle
06:00 AM polprog: i didnt increase it more because the power supply would show UNREG and i didnt want to blow anything up
06:01 AM polprog: with 400Hz pwm you can hear the core click
06:03 AM polprog: but thats a very low freq
06:03 AM polprog: i have to look at what frequency i did spice analysis for, there are some large caps and a 1uH 15A inductor
06:04 AM polprog: that is supposed to sore some power so that the power supply is not hammered non stop
06:04 AM polprog: store*
06:04 AM polprog: good thing my new psu has transient power measurements :)
06:07 AM aandrew: did i do what with my globe now? I mean I've lost a lot of hair up top and if I wax my skull and bounce light off it you could call that illuminating my globe?
02:57 PM rue_mohr: hat.
02:58 PM rue_mohr: so I tested a bunch of cores last night
02:58 PM rue_mohr: and I disregarded something
02:59 PM rue_mohr: some of the cores saturated immediatly
02:59 PM rue_mohr: and I assumed my time scale was just too small
02:59 PM rue_mohr: er, large
02:59 PM rue_mohr: aka, zoom in more
02:59 PM rue_mohr: but
02:59 PM rue_mohr: retentivity
02:59 PM rue_mohr: the test I did was monopolar
03:00 PM rue_mohr: so, if it was a high retentivity core, it would
04:38 PM polprog: im thinking about that mercury arc lamo
04:38 PM polprog: lamp*
04:38 PM polprog: i have these modules somewhere
04:38 PM polprog: something else im thinking about is.. i have these driver modules i made
04:39 PM polprog: they can kick out 5-6A in pulse
04:39 PM polprog: I can measure voltage and current at all times
04:39 PM polprog: I could program it to become a ZVS if I add some HV diodes and an inductive load
04:39 PM polprog: a LARGE inductive load
04:39 PM polprog: :3
04:39 PM polprog: this could be scary
08:47 PM aandrew: trying to think of what I'd do with a 1kW tiny arc lamp
08:47 PM aandrew: besides just wanting it I mean
08:48 PM aandrew: I've been wasting a lot of time dicking around with arduinoes and making MQTT or Zigbee sensors
08:49 PM aandrew: I've got a fairly robust setup now for making the damn thing try like hell to stay connected and detect when it isn't
08:52 PM aandrew: I've noticed that I've become kind of lazy when it comes to coding now
08:52 PM aandrew: just spin up an arduino, clone my basic sensor code and add what I need. it's not particularly clean or efficient but it really doesn't matter 99% of the time
08:53 PM aandrew: as long as it stays online and I can update over wifi I can screw with it. I really hate the arduino build system but not enough to avoid it
08:55 PM aandrew: I did make some pretty good bbq ribs tonight though: https://ibb.co/n9GphXf
08:56 PM aandrew: 100% homemade, the only thing I consider "cheating" was using ketchup instead of boiling down tomatoes and making it myself
08:56 PM aandrew: why are the ribs important? I was trying to keep the bbq at like 190-205F and it was raining so I didn't want to be running out constantly so I used a pt1000 rtd and was trying to graph it :-)
08:58 PM aandrew: the downside to trying to smoke in the bbq is that to keep the temp low enough for fall-off-the-bone ribs I couldn't really get the smoker box to do its job so I ended up cranking the temp on that one side and cracking the lid to let the excess heat escape
08:58 PM aandrew: but it did turn out pretty good. If I could have done the temp regulation better I would have had more bark and softer ribs but these were still pretty damn amazing
10:06 PM aandrew: https://pastebin.com/3MZwXMk1
10:06 PM aandrew: if y'all are interested in my shitty code, at least the "try like hell to stay connected to both MQTT and wifi" bits
11:47 PM rue_mohr: I got a new mini fridge into the shop
11:48 PM rue_mohr: managed to move things around/out to fit it
11:48 PM rue_mohr: one of the boxes I moved out expanded by about 300% tho
11:48 PM rue_mohr: not cool, could hardly fit the stuff in the storage shed
11:50 PM rue_mohr: http://media.ruemohr.org/images/p1340806.jpg new minifridge
11:50 PM rue_mohr: http://media.ruemohr.org/images/p1340807.jpg old one
11:50 PM rue_mohr: now retired
11:50 PM rue_mohr: http://media.ruemohr.org/images/p1340810.jpg this mid-sized box had some rods in it from printers, when I moved it...
11:51 PM rue_mohr: http://media.ruemohr.org/images/p1340811.jpg turned into this massive heap
11:56 PM rue_shop2: strange, there is no more room in the shop, but there is space that I coudl actually lay down on the floor
11:56 PM rue_shop2: how the hell does this work
11:57 PM rue_shop2: hmm, well the garbage can IS full...
11:58 PM aandrew: lol @ cplusplus