#qi-hardware IRC log for Saturday, 2017-07-22

whitequarkDocScrutinizer05: oh huh plasticizer leaking from rubber!04:42
DocScrutinizer05I doubt this stuff seen any rubber ever04:49
DocScrutinizer05feels like extremely softened PVC04:49
DocScrutinizer05I wondered if it might be PE, but I doubt it04:50
DocScrutinizer05the surface feels like Glycol, thinking of PEG, though that's most likely total nonsense04:55
DocScrutinizer05I wonder if PEG works as a softener for PE04:56
DocScrutinizer05heck!04:59
DocScrutinizer05the surface feels like Glycol, thinking of PEG, though that's most likely total nonsense. I wonder if PEG works as a softener for PE. and if PEG would do that sort of damage to Rigols and plastic boxes05:00
whitequarknot PE05:13
whitequarkPEG does not attack PE05:13
whitequarkvery few things do, mostly aromatics and even then05:13
whitequarkPEG would not attack the ABS rigol case05:14
whitequarkor the PP (I think?) plastic box05:14
whitequarkit's almost certainly some kind of phtalate05:15
whitequarkhttps://en.wikipedia.org/wiki/Diethyl_phthalate05:16
whitequark>It is a clear substance that is liquid at room temperature and is only slightly denser than liquid water. It has a faint, disagreeable odor and can be transferred from the plastics that contain it.05:16
promachCould anyone explain the purpose (if possible, some maths equation) for J2 and R2 in https://easyeda.com/guest/Bob_Pease_s_High_Impedance_Active_Scope_Probe_simulations-gsmEyQ8qj ?06:47
promachFor https://i.redd.it/s1sboekd858z.png , why must Cp*Rp = Rin*Cin ?10:05
DocScrutinizer05maybe because you could restructure the math this way, though I'm to lazy to even start thinking about it11:05
DocScrutinizer05looks like nonsense11:05
--- Sun Jul 23 201700:00

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