#qi-hardware IRC log for Friday, 2012-07-06

wpwrakgrmbl. i wonder what they make telephone cables from around here. painted dirt ? a circuit with a current consumption of about 20-30 mA drops some 300 mV across 2*~2m of such cable. so that's around 2-4 Ohm/m.18:06
DocScrutinizer05lol19:45
DocScrutinizer051.7E-6 ohm*cm19:49
DocScrutinizer05~1.7 * 10**-6  / 0.05 / 0.05 * 40019:51
infobot0.27219:51
DocScrutinizer05ohms for 4 m of 0.5*0.5mm (square) wire19:52
DocScrutinizer05~30 * 10**-3 * 0.27219:53
infobot0.0081619:53
DocScrutinizer05~30 * 10**-3 * 4 * 419:54
infobot0.4819:54
DocScrutinizer05err19:54
DocScrutinizer05no err19:55
DocScrutinizer054R * 4m19:55
DocScrutinizer05vs 0.272R @ 4m19:55
DocScrutinizer05~1.7 * 10**-6  / 0.02 / 0.02 * 40019:56
infobot1.719:56
wpwrakheh, (0.5 mm)^2. i wish :)20:01
wpwrakbut when i compare with the same sort of wire they sell at digi-key, it's still an order of magnitude off. very suspicious.20:01
wpwrakmaybe they used aluminium or such. every picocent counts :)20:02
DocScrutinizer05http://www.wolframalpha.com/input/?i=copper+resistivity   "~0.6 * resistivity of alu"20:13
DocScrutinizer05"~0.3 to 0.8 x resistivity of alu alloy at room temp"20:15
wpwrakcould work. make the wire a bit thinner too, and you're there :)20:21
--- Sat Jul 7 201200:00

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