#qi-hardware on 2012-07-06 — irc logs at freenode.irclog.whitequark.org

2011-11-28 00:09 Topic for #qi-hardware is now Copyleft hardware - http://qi-hardware.com | hardware hackers join here to discuss Ben NanoNote, atben / atusb 802.15.4 wireless, and other community driven hw projects | public logging at http://en.qi-hardware.com/irclogs

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18:06 <wpwrak> grmbl. 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.

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19:45 <DocScrutinizer05> lol

19:49 <DocScrutinizer05> 1.7E-6 ohm*cm

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19:51 <DocScrutinizer05> ~1.7 * 10**-6 / 0.05 / 0.05 * 400

19:51 <infobot> 0.272

19:52 <DocScrutinizer05> ohms for 4 m of 0.5*0.5mm (square) wire

19:53 <DocScrutinizer05> ~30 * 10**-3 * 0.272

19:53 <infobot> 0.00816

19:54 <DocScrutinizer05> ~30 * 10**-3 * 4 * 4

19:54 <infobot> 0.48

19:54 <DocScrutinizer05> err

19:55 <DocScrutinizer05> no err

19:55 <DocScrutinizer05> 4R * 4m

19:55 <DocScrutinizer05> vs 0.272R @ 4m

19:56 <DocScrutinizer05> ~1.7 * 10**-6 / 0.02 / 0.02 * 400

19:56 <infobot> 1.7

20:01 <wpwrak> heh, (0.5 mm)^2. i wish :)

20:01 <wpwrak> but when i compare with the same sort of wire they sell at digi-key, it's still an order of magnitude off. very suspicious.

20:02 <wpwrak> maybe they used aluminium or such. every picocent counts :)

20:13 <DocScrutinizer05> http://www.wolframalpha.com/input/?i=copper+resistivity "~0.6 * resistivity of alu"

20:15 <DocScrutinizer05> "~0.3 to 0.8 x resistivity of alu alloy at room temp"

20:21 <wpwrak> could work. make the wire a bit thinner too, and you're there :)

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