<sb0>
yeah they have it, but for this sort of thing .eu usually means .pricy
<sb0>
let me ask the taobao agent... it'd be surprised if the chinese didn't make some; I could not find any, but that might be because of translation problems
<sb0>
one thing that bothers me a bit is the weather here. don't put the photoresist in the fridge = you easily exceed the maximum storage temperature, put it in the fridge = you get tons of water condensing in the bottle from the saturated air
<sb0>
I guess the proper solution is to have AC running in the lab all the time and set at a pretty low temperature, but that will be somewhat pricy (and noisy) as well
<sb0>
or fridge + start the AC before taking the bottle out
<whitequark>
something like that yeah
<sb0>
hmm, how toxic is this stuff...
<whitequark>
llok at MSDS?
<sb0>
the MSDS says ingestion is not an expected route of entry. i guess they didnt think of nerds storing it in the kitchen fridge :)
<whitequark>
otherwise I recommend a dedicated fridge anyway
<whitequark>
if for no other reason than avoiding spores and shit
<whitequark>
kitchen fridge is /dirty/
<whitequark>
what is it you're doing with lithography>?
<sb0>
so i took apart another piece of mediocre chinese equipment today, a "hangzhou dipai" PSU
<sb0>
which has horrible UI, regulation issues with nonlinear loads, and oscillating relays
<sb0>
the problems look unusual with this one, it seems they tried to make it nice (FR4 PCB, connectors on all internal cables, good quality components, heatshrink tubes on exposed solders)
<sb0>
but they don't quite know what they are doing, there are tons of parts and stuff looks overengineered, there are obvious design issues like electrolytic capacitors almost touching the (hot) power transistors, and incorrect PCB footprints with components hacked into place (to the point of soldering through-hole parts on top of SMD footprints)
<sb0>
the microcontroller firmware is crappy as well, hence the UI...
<cr1901_modern>
sb0: Nonlinear loads? So you mean basically any meaningful circuit on this planet?
<sb0>
yes. it happens a lot...
<cr1901_modern>
(Idk many useful circuits that are linear, tbh lol)
<cr1901_modern>
Actually, that makes me think... can a linear amplifier in fact be treated as a linear load? I'm guessing not b/c large scale behavior of transistors.
<sb0>
it's a bit of a shame, because that company makes a lot of PSUs with interesting voltages/currents and they're easy to order
<sb0>
but I guess I'll go somewhere else next time...
<cr1901_modern>
series transistor regulator to get the desired voltage from a "normal" power supply?
<cr1901_modern>
without burning it out with one of those low-power lm3-whatever adjustables?
<cr1901_modern>
sb0: What types of circuits in particular did you test the power supply with? I assume a dummy load resistor checked out, but what else?
<sb0>
oh, all sort of things. digital circuits, a ccfl inverter, ultracapacitors, tungsten wire under various levels of vacuum
<sb0>
it particularly disliked the tungsten in constant-current mode
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<cr1901_modern>
Wasn't aware you could use tungsten as a constant current load. Then again, I'm not aware of a lot of things.
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<GitHub176>
[artiq] sbourdeauducq pushed 1 new commit to master: http://git.io/v4UxJ
<GitHub176>
artiq/master d32c2c0 Sebastien Bourdeauducq: master: scan subdirectories in repos