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* mithro learns how to write gdb Python pretty_printers
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<openfpga-github> [Glasgow] awygle reopened issue #51: Make SYNC pullup smaller
<rqou> azonenberg: ping?
<rqou> or does anybody else here have extensive home labs?
<rqou> awygle?
<awygle> uh define "extensive" but what's up
<rqou> i'd like recommendations of how you organize and keep track of all your stuff :P
<awygle> loool
<awygle> i should take a picture of my bench and send it to you
<rqou> i'm trying to set up for assembling my boards but realizing that i can't find anything
<awygle> so for stuff like that i basically just order new parts for every board, then keep them in the digikey/mouser box forever
<rqou> everything is still in some random boxes from moving out of my apartment
<rqou> let's just say that all of the lab stuff from the last 10+ years hasn't been organized either
<awygle> then i have a "soldering stuff" box which is the oven, the iron, the paste, the flux, the swabs, the iso, the wipes, and... i think that's it
<awygle> pretty sure i know how helpful that is, and the answer is "not" :P
<rqou> yeah, i kinda have way more stuff than that
<awygle> yeah i'm a bad resource for this, "organized" is not one of my strengths
<rqou> yeah, right now i can't even find basic supplies like "power cords" or "scrap PCBs"
<rqou> lol me neither
<awygle> maybe when i move in a couple weeks i'll suddenly becomes amazing at it :p
<rqou> also apparently the reason i can't find my empty plastic bin (for swap space of course) is because my father used it :P
<rqou> so now it's no longer empty
<rqou> i bet my mom (the not-an-engineer) loves us :P
<openfpga-github> [Glasgow] awygle created rev-c (+1 new commit):
<openfpga-github> Glasgow/rev-c 37b2e0d awygle: Initial Rev C IO cell schematic.
<openfpga-github> [Glasgow] awygle closed issue #51: Make SYNC pullup smaller
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<awygle> whitequark: so here's _an_ analysis of series resistor values
<awygle> (actually here's three analyses)
<awygle> i would characterize my confidence in them as "medium high, about 70% or so"
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<awygle> ( azonenberg , any chance you're taking a break from house? :p)
<awygle> i welcome input from anybody who has some. i'm not totally sure of the right way to approach this problem.
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<awygle> oh I should just spice this
<awygle> not tonight tho
<rqou> i just realized i never assembled my t962 thermocouple upgrade
<rqou> which means i now need to go find it lol
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<rqou> wheee i _finally_ found my board
<rqou> after an hour+ of searching
<rqou> azonenberg: ping?
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<azonenberg> rqou: back
<rqou> azonenberg: two questions
<rqou> 1) do you have a system for tracking where all your lab shit is? :P
<rqou> 2) what is your standard reflow profile?
<azonenberg> 1) no, i have standard places for where tools go and when they're not there i get mad :p
<rqou> lolol
<azonenberg> Because it means somebody touched it, or i didn't put it away
<azonenberg> Usually the latter (got interrupted while working)
<azonenberg> 2) Place board on cookie sheet, set convection toaster oven to "cookies" mode / 425F
<azonenberg> turn on, wait until solder melts
<rqou> right, you still use that hack profile
<azonenberg> wait another 15 sec, turn off oven, wait 15 sec, open door
<azonenberg> i havent measured the actual temperatures but it gives very good performance m
<azonenberg> my only complaint is the peak temp is about 10-15F lower than i'd like
<rqou> actually, another question: i have some unrefrigerated solder paste from a year+ ago that i never got around to using, is it still any good or should i chuck it?
<rqou> azonenberg: also: if i am uncertain about the performance of my reflow oven, what is the "safer" direction to adjust the profile?
<azonenberg> rqou: i dont fridge my paste, i find evaporation of solvents is mostly what kills it
<azonenberg> higher temps lead to a tiny bit of oxidation on the solder balls but i've never had yield issues from that
<azonenberg> If it doesn't print right, i chuck it though
<rqou> oh i'm not going to use it on my actual board
<azonenberg> i tend to replace paste about every year due to solvent loss issues
<rqou> i was going to just try it on the thermocouple mod board for my T962
<rqou> which doesn't have a stencil anyways
<azonenberg> it starts to get too thick and dry and acts more like that sculpy sand stuff than paste
<rqou> yeah it definitely looks like that already
<azonenberg> Then i'd toss it, but i'd say that's from old age and not lack of refrigeration
<azonenberg> syringes last longer than jars b/c lower exposed surface area but you do still get diffusion through the plunger etc
<azonenberg> they're not airtight
<rqou> this is a jar so probably even worse
<rqou> > also: if i am uncertain about the performance of my reflow oven, what is the "safer" direction to adjust the profile?
<azonenberg> Regarding performance, i dont have any empirical data on my oven's actual temp or anything
<azonenberg> Basically what you're shooting to do is hit the melting point of SAC305 (219C) then at least another 5-10 deg to get good flowing
<azonenberg> but not tooooo much beyond that
<rqou> and if you leave it too long?
<azonenberg> i think i hit like 225-230C on my oven and 240-260 is closer to optimal process window
<azonenberg> You risk compromising long-term reliability and maybe messing with trim on sensitive analog
<azonenberg> but a short overcook probably wont outright kill the chip
<azonenberg> i have never had a part fail from a proper reflow
<azonenberg> the only time i've killed parts with heat is with excessive hot airing
<azonenberg> and we're talking things like insulation on an inductor burning off
<azonenberg> or plastic connectors melting
<azonenberg> not semiconductor failure
<rqou> so if i'm not sure, can i adjust the reflow time towards the longer side and slightly higher temps?
<rqou> i'll probably make the preheat time longer too
<rqou> wait wait wait
<rqou> azonenberg: you don't use a trapezoid profile at all?
<azonenberg> I rely on the thermal inertia of the oven to get me close enough
<azonenberg> but its roughly a linar ramp
<azonenberg> linear*
<azonenberg> i used to use a trapezoidal profile on my old IR oven with no convectoin
<azonenberg> this one heats evenly and not too aggressively, it usually takes somewhere around 6-8 minutes to do a full reflow cyclew
<azonenberg> and the whole board melts within a few seconds
<azonenberg> so very uniform temps
<rqou> hmm so most of your issues are with connectors and other "weird" parts?
<azonenberg> I have never, i repeat never, had a part designed to survive reflow fail in this oven
<azonenberg> only during rework or hand soldering
<rqou> ah
<azonenberg> And with my old single element IR toaster oven that was so non-uniform sometimes the middle of the board would scorch before the edges melted
<rqou> how do you do double-sided load?
<azonenberg> I pick the side with the lower number of high-mass components/connectors, typically designated the bottom in cad
<azonenberg> paste, place, reflow
<azonenberg> let cool fully to room temp
<azonenberg> Flip over, paste top side (still working on a good jig to do this)
<azonenberg> place, reflow
<azonenberg> Let cool a bit, then hand solder PTH
<rqou> do you have a jig to hold the board up?
<azonenberg> I build one to suit out of scrap pcb and masking tape
<azonenberg> talking to a locla machine shop about making a proper jig
<azonenberg> local*
<azonenberg> nobody seems to make such a product
<azonenberg> you can get printers for full framed stencils easily
<azonenberg> but nobody has a good adjustable jig for using frameless stencils on a 2-side-placement board
<azonenberg> anyway, in the very rare situation that i have a high density part on the underside
<azonenberg> i'll either epoxy it down or hand solder / hot air after the reflow is done
<azonenberg> i've epoxied a few big connectors
<azonenberg> but you'd be surprised at how well parts stay on especially with lead-free solder which has slightly stronger surface tension
<azonenberg> There's an equation you can find if you google around to calculate how heavy a part can be unsupported on a bottom side of a board
<azonenberg> based on the surface tension coefficient of your solder alloy, mass of the part, and i believe the sum of perimeters of the smt pads
<azonenberg> then multiply by some safety margin
<rqou> yeah well i'm usually not brave enough to put huge parts on both sides
<azonenberg> Rough rule of thumb, SMT electrolytic caps are a no-go
<azonenberg> pretty much all chip components are fine
<rqou> e.g. right now the bottom only has ceramic caps
<azonenberg> small qfn/sot/sop are fine
<azonenberg> i'd be leery of a >100 pin qfp
<rqou> what about a giant 1000+ ball bga on the bottom?
<azonenberg> too heavy and not enough pad area
<azonenberg> honestly, i'd declare that the top of the board and worry about what was on the other side instead :p
<rqou> what if you have one of those on both sides :P :P :P
<azonenberg> Since i probably dont have 1000+ ball bgas on both sides
<azonenberg> For thermal reasons
<azonenberg> you need heatsinks on parts that large, typically
<azonenberg> And its easier to have one side of the board be the heatsink side
<azonenberg> also, routability
<rqou> but more seriously, something like ddr rams in "clamshell" wiring would be fine?
<azonenberg> it's an improbable enough scenario i've never spent any time thinking about how to deal with it
<azonenberg> Yes, ddr bgas should be fine without any underfill or epoxy
<azonenberg> it's mostly large SMT connectors that i'd be concerned about or glue
<azonenberg> like a smt magjack
<azonenberg> If i had to put that on the bottom i'd glue it
<rqou> i usually don't run those connectors through reflow anyways
<azonenberg> after the first reflow profile, so it self-aligns
<azonenberg> You can get them SMT designed for reflow
<azonenberg> normal ones arent
<azonenberg> My point is, if you use reasonable DFM practices when designing the board
<azonenberg> 2-side reflow is largely a non-issue
<azonenberg> its just a second pass doing exactly what you did the first time
<azonenberg> the only challenge is pasting it, like i said i'm still working out a good jig
<rqou> yeah i don't have a good setup either
<rqou> i should get my laser cutter working again and make a jig
<azonenberg> is what i had in mind
<azonenberg> but i never actually built it
<rqou> pretty easily built with a laser it seems?
<rqou> or at least possible to adjust to be lasercutter-friendly
<rqou> should be like 30 minutes on a mill if i had one
<azonenberg> i was looking at using a mill
<azonenberg> then laser cut pmma for the top surface
<azonenberg> But i could also just mill a step into it
<azonenberg> either way largely aluminum construction
<azonenberg> and i have to finalize the details, the hard part is making it adjustable to work with arbitrary sized PCB
<rqou> i really want a mill, but ENOSPC
<azonenberg> 3-side support is definitely easier than 4
<rqou> also ENOMONEY
<rqou> azonenberg: don't like 3d-printing? :P
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<azonenberg> i dont think the tolerances are tight enough
<azonenberg> especially for moving around, setscrews, etc
<azonenberg> maybe a laser resin one but not fdm
<rqou> yeah, i don't get why everybody is still nuts about 3d printing
<azonenberg> dont get me wrong, its a great process for certain applications
<azonenberg> ... for certain applications :p
<rqou> sure
<awygle> hey azonenberg
<azonenberg> o/
<azonenberg> whats up
<awygle> can you glance at this for me?
<awygle> current/slew rate limiting slash series termination calculations for Glasgow
<awygle> I'm a bit unsure because it's bidirectional and also weird
<awygle> Gonna spice it tomorrow but would appreciate your thoughts
<azonenberg> I can't help but laugh
<azonenberg> every... single... one
<awygle> Yeah yeah you went through this already :-P
<azonenberg> you guys are hitting every design decision i made in starshipraider
<azonenberg> and every problem
<awygle> Well of course we are
<awygle> Same rough problem same rough design space
<awygle> We just have a different cost function to optimize
<azonenberg> it's very much validating to my engineering though
<rqou> nobody seems to like my approach of "have simple buffers and hope that only those get blown up"
<azonenberg> in that so far, you havent found any grossly superior alternatives
<awygle> rqou: I wanted to run straight off the fpga lol
<rqou> i'm not quite _that_ brave
<awygle> but people need 5v apparently *shrug*
<azonenberg> total trace cap is pF? or pF/cm
<awygle> it's pF
<rqou> i still need to find time to work on my project Guren :P
<azonenberg> your target is 50 MHz?
<awygle> yeah that's the max on the level shifter for Rev B
<azonenberg> keep in mind, two cascaded filters with -3 dB cutoff
<azonenberg> will be more like -6 dB at 50 MHz
<azonenberg> (and 50 MHz != 50 Mbps)
<awygle> they're not cascaded though, it redrives
<azonenberg> oh, ok
<awygle> and it's 100Mbps/50MHz
<azonenberg> still -3 dB is half your amplitude gone
<awygle> true, should probably up that
<awygle> too used to 3dB not matter ing
<awygle> 5x you think? 250MHz
<azonenberg> this isnt rf :p lol
<azonenberg> i'd look at what typical Vih/Vil of target devices are
<azonenberg> then calculate how many dB you can tolerate
<azonenberg> figure out the max freq you care about for nice rise times and a decent eye opening
<rqou> azonenberg: btw, do you clean boards before pasting them?
<azonenberg> i'm doing theoretical work to roughly estimate but then actually plotting PRBS's to validate
<awygle> yeah ok
<awygle> more math :-(
<azonenberg> rqou: yes and no
<rqou> awygle: hey, that's what your fancy piece of paper qualifies you for :P :P :P
<azonenberg> If fresh from the fab i am not too worried about contamination
<azonenberg> however, when i sand off the mouse bites i get fiberglass dust all over the board
<rqou> nah this board has been sitting around for like 2 years (the t962 mod board)
<azonenberg> So i use a lint-free wipe with some IPA to remove it
<awygle> I hate those goddamn mouse bites
<azonenberg> and i often give the face of the pcb a little wipe
<azonenberg> but its for dust removal, not surface cleaning
<awygle> Either they look like shit or they make me all itchy
<azonenberg> if it had been sitting around for a while i'd do a more extensive IPA scrub
<awygle> We should never have invented fiberglass
<rqou> awygle: yeah, just use asbestos instead :P
<azonenberg> awygle: hey, if you want more fiberglass
<azonenberg> come over my house
<rqou> gotta pay the mesothelioma lawyers somehow :P :P :P
<azonenberg> we have cubic yards of it that need to go up this weekend
<azonenberg> hoping to get insulation inspected mon-tues :p
<rqou> O_o that fast?
<rqou> oh wait, insulation
<rqou> not sheetrock
<awygle> I deeply do not want more fiberglass
<azonenberg> lol
<azonenberg> rqou: we finished another room today
<awygle> Anyway thanks for the notes azonenberg
<azonenberg> sheetrock arrives monday
<awygle> I'm going to bed
<azonenberg> awygle: but yeah i would definitely spice it
<rqou> also, how the fuck is mesothelioma so SEO-ed?
<azonenberg> then build a prototype and validate
<awygle> I think we can solve this problem with a 39 Ohm resistor and bigger caps
<azonenberg> rqou: because one suit can win you $$$$M
<awygle> But we'll find out tomorrow and then again much later
<azonenberg> its literally the most seo'd query
<azonenberg> a single link click costs the advertiser like 50 USD or something
<rqou> is it?
<rqou> <foo>.dll is also pretty full of SEO spam
<azonenberg> Last time i saw stats yet
<azonenberg> yes*
<azonenberg> that is up there but not to the point of extreme adwords spedning
<rqou> also, is it just me or is the "<foo>.dll" SEO spam getting worse and worse?
<rqou> (also, i also work for a company that does search now so glass houses and all that)
<azonenberg> havent looked in a while since i dont use windows
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<whitequark> rqou: uh, i have an extensive home lab
<rqou> whitequark: ok, how do you organize it?
<whitequark> rqou: which parts
<whitequark> for chemistry i have two ikea cabinets, one has reagents in bottles sorted by type on each shelf
<rqou> any of it? right now i have a giant clusterfuck of plastic bins from when i moved out of berkeley
<whitequark> i.e. salts/dry organics on top shelf, then solvents, then acids/bases, then empty bottles
<whitequark> or rather acids/bases are temporarily in a different cabinet until i add proper spill protection
<whitequark> the other cabinet has glassware just lying on shelves
<whitequark> ideally there would be heavy foam with cutouts, but i couldnt find any that wasnt for a ridiculous price
<whitequark> so, the glassware is there sorted. uhhh
<rqou> no acid-proof/flame-proof/explosion-proof cabinets?
<whitequark> top shelf: pipettes, then distillation heads and condensers, then assorted flasks, then funnels and such, then stirring rods, on the bottom shelf i store the heavieststuff
<whitequark> like magstirrers and dessicators
<whitequark> flame-proof/explosion-proof: i dont store any solvents volatile enough to warrant that, like diethyl ether
<whitequark> if i do it will probably just be outside
<whitequark> this apartment is generally way too flammable for comfort
<whitequark> acid-proof: just get $1 PP boxes
<whitequark> PP is resistant to pretty much all common acids incl conc sulfuric
<whitequark> and even piranha
<whitequark> i don't think it'll survive rfna
<whitequark> but generally, common PE/PP storage ware you get from home despot or whatever is well acid proof enough to equip a real lab with it that doesn't have budgets you get from working on the stuff that's in fashion
<whitequark> like how do you think highschool or just underfunded labs get equipped in ru? people go to fucking ikea
<rqou> lol really?
<whitequark> for a chem table, take a PP or HDPE sheet and fix it to a regular ikea table with uhhh
<whitequark> yes
<whitequark> obviously duh
<whitequark> if we're talking about biology, i'm -pretty- sure some people use pressure cookers instead of autoclaves
<rqou> my high school worked by having some competent teachers go poking around local biotech companies to salvage stuff they're throwing away
<whitequark> so, here's two general schools of thought
<whitequark> first, you can get surplus/discarded equipment and teach your students on the real deal
<whitequark> the US has the best surplus equipment market in the world so it makes a whole lot of sense to make good use of it
<whitequark> second, you can get by with whatever's in your local hardware store, and teach your students how shit works in the real world
<whitequark> you'll be surprised how much of biotech is just slapping shit together
<whitequark> sure, there's stuff like flow cells and nanopore sequencers, but for each of those there's a hundred undergrads on a shoestring budget
<rqou> well, my high school was silicon-valley-adjacent so there was definitely fancy stuff floating around
<rqou> not for the actual IT infrastructure though
<whitequark> awygle: re USB C: sure, let's have USB C in compat mode
<whitequark> it doesn't need a board cutout, less headache
<whitequark> and we should use a PTH one I think
<whitequark> though I'm not sure
<rqou> whitequark: hmm now i'm curious: what is/was the state of IT in RU high schools?
<whitequark> maybe one with PTH tabs
<whitequark> rqou: dunno, mine isn't representative
<rqou> e.g. my school was running win95 on some machines up until ~2011-2012
<whitequark> wtf
<whitequark> no we had xp in 2007-2009
<rqou> most machines were xp
<whitequark> and there was a linux experiment going on
<whitequark> state-sponsored actually
<rqou> just some win95 lingered around
<whitequark> not sure if it ever grew into something useful
<rqou> when they got replaced it was because we got a new principal who also said "wtf"
<rqou> plus there was some economic stimulus whatever going around
<rqou> so everything that was a piece of junk got upgraded to win7
<rqou> whitequark: how common are really dumb contracts with kickbacks in RU?
<rqou> or is corruption more overt there? :P
<whitequark> rqou: kickbacks are extremely common
<whitequark> corruption takes all forms.
<whitequark> if patrol cops catch you with drugs, they openly say that either you pay them (say) 100k rub, or they plant more drugs on you, enough for a prison term
<whitequark> amusingly, the price varies depending on how much they think you'll pay. if they're in good mood, some poor student might get away with 10k
<whitequark> you also get a ride to the nearest atm in the patrol car, you know, convenience and all
<whitequark> awygle: so I don't get where you got 160 ohm resistors
<rqou> whelp, this was a total disaster
<rqou> solder paste got nowhere near melting
<rqou> reworking a failed reflow is really difficult
<whitequark> really?
<whitequark> i threw out my old shitty hot air gun and now it's a breeze
<whitequark> i can desolder FPCs every single time without so much as making them slightly brown, and that's with lead-free
<whitequark> FPC connectors
<whitequark> well, I can desolder FPCs too, but not with a heat gun
<whitequark> honestly I've yet to find a circuit I couldn't rework when needed lol
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<cr1901_modern> whitequark: What heat gun do you use? I assume you have a nozzle for it as well?
<whitequark> cr1901_modern: no nozzle
<whitequark> just whatever it goes with
<whitequark> it's a local brand, some chinese made gun relabeled i think
<whitequark> not sure which
<cr1901_modern> I would've figured that not having a nozzle would be too imprecise and you'd blast nearby components w/ too much heat accidentally
<cr1901_modern> I guess the air between the gun and components is enough to prevent this
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<awygle> whitequark: that's because 160 was before azonenberg reminded me this isn't rf
<awygle> classic non functional comments problem
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<rqou> whelp, i think i plugged something in wrong and blew out the power stage of the reflow oven
<rqou> goddammit
<rqou> FML
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<eduardo> bubble_buster: as a university you very likely get a free license of the SymbiticEDA suite which includes SV support (once the license manager is done :-) Just get in contact with
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<qu1j0t3> pie_: why do you hate disruption
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<pie_> azonenberg you need to make an intel socket compatible riscv processor for replacing intel chips in old thinkpads
<pie_> take us into the light
<zkms> more useful would be to make a replacement for PCH since that's where Intel Management Engine lives
<pie_> yeah i wasnt really going for feasible x)
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<eduardo> yrozap:
<eduardo> cyrozap: your webpage is dead. Your Twitter account is inactive. I am working with @oe1cxw and others on OSS FPGA tools. is the commercail framework for it.
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<kc8apf> rqou: I use a few different systems depending on what I'm storing.
<kc8apf>,43326 are great for fasteners, connectors, and other medium-size objects
<kc8apf> Systainers for power tools and larger jigs
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<awygle> why are plastic boxes so expensive :(
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<kc8apf> idk. I consider the Allit boxes a bargain compared to Sortimo
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<kc8apf> still looking for a better solution than ziplock bags in a cardboard box for vacuum tubes
<awygle> the leevalley and aidetek here seem, subjectively, to be good prices for what they are. the allits seem pricey relative to complexity. but i know ~nothing about boxes or plastic or manufacturing.
<awygle> at some point i really have to get over my extremely incorrect ideas of how much things cost
<kc8apf> Lee Valley is just reselling Allit
<kc8apf> the small Allits were $9 a few weeks ago
<kc8apf> I need to find a distributor who deals in bulk sales
<rqou> goddammit today i poked around at the reflow oven and it's working again
<rqou> FML again
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<rqou> anyways, reflow oven mod finally seems to work correctly
<rqou> now i can actually get back to tuning reflow profiles
<rqou> also, the MAX31850 is a really really cool chip
<awygle> i feel like i had a problem with that chip and grounding, but i can't remember the details
<rqou> wait how?
<rqou> it only has a single ground pin
<rqou> also, why were you using this chip?
<awygle> idk, i maybe ended up with a ground loop because the tc was contacting the oven
<rqou> ah maybe
<rqou> i did seem to have an issue with bad readings if you don't clean enough flux off
<rqou> but that's probably typical for sensitive analog
<awygle> the tc i had was the "drill a hole and screw it in" type and one side was shorted to the screwing part
<awygle> iirc
<rqou> also i love how the adafruit breakout for this part is $15 for one sensor
<rqou> i guess it might be good if you don't enjoy spending hours reworking a failed reflow
<rqou> adafruit pricing is always really screwy to me
<rqou> some stuff like breakouts are crazy expensive
<rqou> some parts like pin headers are actually cheaper than many other vendors for the quality that you get
<digshadow> kc8apf awygle:
<digshadow> theres also a link to my thoughts on wire shelving there
<awygle> cool
<rqou> my problem right now is "how do i convert 10+ years of disorganization into something usable"
<zkms> hmm are there ICs like MAX31850 except that can handle multiple thermocouple channels?
<rqou> just use multiple of them? :P
<rqou> it's 1-wire so you don't need any more pins
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<rqou> anybody here extensively familiar with lead-free soldering? azonenberg? awygle?
<rqou> <-- this is with the same reflow profile but new temperature sensors
<rqou> do i need more time above liquidus or is this ok?
<awygle> I'm a leaded guy except very recently
<rqou> fine, what's your opinion as a mostly-leaded-solder user? :P
<rqou> also, no rohs for you?
<rqou> hmm apparently crappy-looking joints like this are "normal" for lead-free
<rqou> i'm probably going to tweak time above liquidus to be slightly higher though
<cyrozap> eduardo: Thanks for the heads-up. Looks like the server was completely locked up for the past few weeks--maybe I should get some monitoring on that :P
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<cpresser> rqou: how old was this paste? was it well mixed?
<cpresser> it seems like the flux did not properly activate
<rqou> brand new, but just haphazardly syringed onto a scrap board
<cpresser> ir-reflow?
<rqou> yes
<rqou> the scrap board is also several years old and wasn't cleaned
<awygle> Yeah I'd bump the temp a bit maybe. And clean the board first.
<cpresser> its hard to tell what exactly went wrong.
<awygle> I'm trying to transition to rohs but space hates rohs so it's recent for me
<rqou> i mean, i did see everything liquify
<rqou> it just looks like a cold joint, but I'm used to leaded
<cpresser> imho its a flux issue
<awygle> Possibly very stupid question - does it make sense to anybody to write a *C* wrapper for a *python* library?
<cpresser> the pads should be fully covered if the flux works as intended.
<cpresser> the big pad left of the D1 text shows this very clearly
<cpresser> got a link to the paste you used?
<rqou> ok, i ran the same board through a second cycle with more flux and it looks better
<rqou> cpresser: it's kester nxg1 as repacked by oshstencils
<rqou> still doesn't fully cover the pad though
<cpresser> how did you add flux? isnt the flux in the paste?
<rqou> the paste does have flux
<cpresser> yep, just checked the datasheet
<cpresser> usually the soak- or dwell-zone in the profile is intended to activate the flux. perhaps yours was to short?
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<rqou> alright, i ran an adjusted profile and the texture of the solder looks fine now but pads still aren't fully covered
<rqou> time above liquidus is a bit on the long side at ~90 seconds
<rqou> I'll try adjusting soak to be longer
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<rqou> cpresser: ok, longer soak seems to be better
<rqou> residual issues seem to just be a result of haphazard syringing and the fact that lead-free just doesn't wet the pads as eagerly as leaded
<rqou> also combined with "this board is really really old"
<rqou> probably good to go for the real board with an actual stencil
<rqou> yeah, the test board was really difficult to solder on even by hand so it's probably just oxidized
<rqou> or contaminated
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